ha_tokudb.cc 288 KB
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#ifdef USE_PRAGMA_IMPLEMENTATION
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#pragma implementation          // gcc: Class implementation
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#endif

#define MYSQL_SERVER 1
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#include "toku_mysql_priv.h"
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#include "hatoku_cmp.h"
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extern "C" {
#include "stdint.h"
#if defined(_WIN32)
#include "misc.h"
#endif
}
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static inline void *thd_data_get(THD *thd, int slot) {
    return thd->ha_data[slot].ha_ptr;
}

static inline void thd_data_set(THD *thd, int slot, void *data) {
    thd->ha_data[slot].ha_ptr = data;
}

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#undef PACKAGE
#undef VERSION
#undef HAVE_DTRACE
#undef _DTRACE_VERSION

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//#include "tokudb_config.h"
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/* We define DTRACE after mysql_priv.h in case it disabled dtrace in the main server */
#ifdef HAVE_DTRACE
#define _DTRACE_VERSION 1
#else
#endif

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#include "hatoku_defines.h"
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#include "ha_tokudb.h"
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#include "hatoku_hton.h"
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#include <mysql/plugin.h>

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static const char *ha_tokudb_exts[] = {
    ha_tokudb_ext,
    NullS
};
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#define lockretryN(N) \
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  for (ulonglong lockretrycount=0; lockretrycount<(N/(1<<3) + 1); lockretrycount++)
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#define lockretry_wait \
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        if (error != DB_LOCK_NOTGRANTED) { \
            break;  \
        } \
        if (tokudb_debug & TOKUDB_DEBUG_LOCKRETRY) { \
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	  TOKUDB_TRACE("%s count=%d\n", __FUNCTION__, (int) lockretrycount); \
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        } \
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        if (lockretrycount%200 == 0) { \
            if (ha_thd()->killed) { \
                error = DB_LOCK_NOTGRANTED; \
                break; \
            } \
        } \
        usleep((lockretrycount<4 ? (1<<lockretrycount) : (1<<3)) * 1024); \
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//
// This offset is calculated starting from AFTER the NULL bytes
//
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inline u_int32_t get_fixed_field_size(KEY_AND_COL_INFO* kc_info, TABLE_SHARE* table_share, uint keynr) {
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    uint offset = 0;
    for (uint i = 0; i < table_share->fields; i++) {
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        if (kc_info->field_lengths[i] && !bitmap_is_set(&kc_info->key_filters[keynr],i)) {
            offset += kc_info->field_lengths[i];
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        }
    }
    return offset;
}


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inline u_int32_t get_len_of_offsets(KEY_AND_COL_INFO* kc_info, TABLE_SHARE* table_share, uint keynr) {
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    uint len = 0;
    for (uint i = 0; i < table_share->fields; i++) {
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        if (kc_info->length_bytes[i] && !bitmap_is_set(&kc_info->key_filters[keynr],i)) {
            len += kc_info->num_offset_bytes;
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        }
    }
    return len;
}


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static int allocate_key_and_col_info ( TABLE_SHARE* table_share, KEY_AND_COL_INFO* kc_info) {
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    int error;
    //
    // initialize all of the bitmaps
    //
    for (uint i = 0; i < MAX_KEY + 1; i++) {
        error = bitmap_init(
            &kc_info->key_filters[i],
            NULL,
            table_share->fields,
            false
            );
        if (error) {
            goto exit;
        }
    }
    
    //
    // create the field lengths
    //
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    kc_info->field_lengths = (u_int16_t *)my_malloc(table_share->fields*sizeof(u_int16_t), MYF(MY_WME | MY_ZEROFILL));
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    kc_info->length_bytes= (uchar *)my_malloc(table_share->fields, MYF(MY_WME | MY_ZEROFILL));
    kc_info->blob_fields= (u_int32_t *)my_malloc(table_share->fields*sizeof(u_int32_t), MYF(MY_WME | MY_ZEROFILL));
    
    if (kc_info->field_lengths == NULL || 
        kc_info->length_bytes == NULL || 
        kc_info->blob_fields == NULL ) {
        error = ENOMEM;
        goto exit;
    }
exit:
    if (error) {
        for (uint i = 0; MAX_KEY + 1; i++) {
            bitmap_free(&kc_info->key_filters[i]);
        }
        my_free(kc_info->field_lengths, MYF(MY_ALLOW_ZERO_PTR));
        my_free(kc_info->length_bytes, MYF(MY_ALLOW_ZERO_PTR));
        my_free(kc_info->blob_fields, MYF(MY_ALLOW_ZERO_PTR));
    }
    return error;
}

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/** @brief
    Simple lock controls. The "share" it creates is a structure we will
    pass to each tokudb handler. Do you have to have one of these? Well, you have
    pieces that are used for locking, and they are needed to function.
*/
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static TOKUDB_SHARE *get_share(const char *table_name, TABLE_SHARE* table_share) {
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    TOKUDB_SHARE *share = NULL;
    int error = 0;
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    uint length;
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    pthread_mutex_lock(&tokudb_mutex);
    length = (uint) strlen(table_name);

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    if (!(share = (TOKUDB_SHARE *) my_hash_search(&tokudb_open_tables, (uchar *) table_name, length))) {
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        char *tmp_name;

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        //
        // create share and fill it with all zeroes
        // hence, all pointers are initialized to NULL
        //
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        if (!(share = (TOKUDB_SHARE *) 
            my_multi_malloc(MYF(MY_WME | MY_ZEROFILL), 
                            &share, sizeof(*share),
                            &tmp_name, length + 1, 
                            NullS))) {
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            pthread_mutex_unlock(&tokudb_mutex);
            return NULL;
        }
        share->use_count = 0;
        share->table_name_length = length;
        share->table_name = tmp_name;
        strmov(share->table_name, table_name);
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        error = allocate_key_and_col_info(table_share, &share->kc_info);
        if (error) {
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            goto exit;
        }

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        bzero((void *) share->key_file, sizeof(share->key_file));
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        error = my_hash_insert(&tokudb_open_tables, (uchar *) share);
        if (error) {
            goto exit;
        }
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        thr_lock_init(&share->lock);
        pthread_mutex_init(&share->mutex, MY_MUTEX_INIT_FAST);
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        my_rwlock_init(&share->num_DBs_lock, 0);
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    }

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exit:
    if (error) {
        pthread_mutex_destroy(&share->mutex);
        my_free((uchar *) share, MYF(0));
        share = NULL;
    }
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    pthread_mutex_unlock(&tokudb_mutex);
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    return share;
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}

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void free_key_and_col_info (KEY_AND_COL_INFO* kc_info) {
    for (uint i = 0; i < MAX_KEY+1; i++) {
        bitmap_free(&kc_info->key_filters[i]);
    }
    
    for (uint i = 0; i < MAX_KEY+1; i++) {
        my_free(kc_info->cp_info[i], MYF(MY_ALLOW_ZERO_PTR));
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        kc_info->cp_info[i] = NULL; // 3144
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    }
    
    my_free(kc_info->field_lengths, MYF(MY_ALLOW_ZERO_PTR));
    my_free(kc_info->length_bytes, MYF(MY_ALLOW_ZERO_PTR));
    my_free(kc_info->blob_fields, MYF(MY_ALLOW_ZERO_PTR));
}

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static int free_share(TOKUDB_SHARE * share, bool mutex_is_locked) {
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    int error, result = 0;

    pthread_mutex_lock(&tokudb_mutex);

    if (mutex_is_locked)
        pthread_mutex_unlock(&share->mutex);
    if (!--share->use_count) {
        DBUG_PRINT("info", ("share->use_count %u", share->use_count));

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        //
        // number of open DB's may not be equal to number of keys we have because add_index
        // may have added some. So, we loop through entire array and close any non-NULL value
        // It is imperative that we reset a DB to NULL once we are done with it.
        //
        for (uint i = 0; i < sizeof(share->key_file)/sizeof(share->key_file[0]); i++) {
            if (tokudb_debug & TOKUDB_DEBUG_OPEN) {
                TOKUDB_TRACE("dbclose:%p\n", share->key_file[i]);
            }
            if (share->key_file[i]) { 
                error = share->key_file[i]->close(share->key_file[i], 0);
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                assert(error == 0);
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                if (error) {
                    result = error;
                }
                share->key_file[i] = NULL;
            }
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        }
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        free_key_and_col_info(&share->kc_info);
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        if (share->status_block && (error = share->status_block->close(share->status_block, 0))) {
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            assert(error == 0);
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            result = error;
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        }
        
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        my_hash_delete(&tokudb_open_tables, (uchar *) share);
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        thr_lock_delete(&share->lock);
        pthread_mutex_destroy(&share->mutex);
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        rwlock_destroy(&share->num_DBs_lock);
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        my_free((uchar *) share, MYF(0));
    }
    pthread_mutex_unlock(&tokudb_mutex);

    return result;
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}

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#define HANDLE_INVALID_CURSOR() \
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    if (cursor == NULL) { \
        error = last_cursor_error; \
        goto cleanup; \
    }

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/* 
 *  returns NULL terminated file extension string
 */
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const char **ha_tokudb::bas_ext() const {
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    TOKUDB_DBUG_ENTER("ha_tokudb::bas_ext");
    DBUG_RETURN(ha_tokudb_exts);
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}

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static inline bool is_insert_ignore (THD* thd) {
    //
    // from http://lists.mysql.com/internals/37735
    //
    return thd->lex->ignore && thd->lex->duplicates == DUP_ERROR;
}

static inline bool is_replace_into(THD* thd) {
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    return thd->lex->duplicates == DUP_REPLACE;
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}

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static inline bool do_ignore_flag_optimization(THD* thd, TABLE* table, bool opt_eligible) {
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    uint pk_insert_mode = get_pk_insert_mode(thd);
    return ( 
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        opt_eligible && 
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        (is_replace_into(thd) || is_insert_ignore(thd)) && 
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        ((!table->triggers && pk_insert_mode < 2) || pk_insert_mode == 0)
        );
}

ulonglong ha_tokudb::table_flags() const {
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    return (table && do_ignore_flag_optimization(ha_thd(), table, share->replace_into_fast) ? 
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        int_table_flags | HA_BINLOG_STMT_CAPABLE : 
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#if defined(HA_GENERAL_ONLINE)
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        int_table_flags | HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE | HA_ONLINE_ALTER);
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#else
        int_table_flags | HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE);
#endif
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}

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//
// Returns a bit mask of capabilities of the key or its part specified by 
// the arguments. The capabilities are defined in sql/handler.h.
//
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ulong ha_tokudb::index_flags(uint idx, uint part, bool all_parts) const {
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    TOKUDB_DBUG_ENTER("ha_tokudb::index_flags");
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    assert(table_share);
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    ulong flags = (HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER | HA_KEYREAD_ONLY | HA_READ_RANGE);
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    if (table_share->key_info[idx].flags & HA_CLUSTERING) {
        flags |= HA_CLUSTERED_INDEX;
    }
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    DBUG_RETURN(flags);
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}

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//
// struct that will be used as a context for smart DBT callbacks
// contains parameters needed to complete the smart DBT cursor call
//
typedef struct smart_dbt_info {
    ha_tokudb* ha; //instance to ha_tokudb needed for reading the row
    uchar* buf; // output buffer where row will be written
    uint keynr; // index into share->key_file that represents DB we are currently operating on
} *SMART_DBT_INFO;

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typedef struct index_read_info {
    struct smart_dbt_info smart_dbt_info;
    int cmp;
    DBT* orig_key;
} *INDEX_READ_INFO;

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int ai_poll_fun(void *extra, float progress) {
    LOADER_CONTEXT context = (LOADER_CONTEXT)extra;
    if (context->thd->killed) {
        sprintf(context->write_status_msg, "The process has been killed, aborting add index.");
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        return ER_ABORTING_CONNECTION;
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    }
    sprintf(context->write_status_msg, "Adding of indexes about %.1f%% done", progress*100);
    thd_proc_info(context->thd, context->write_status_msg);
    return 0;
}

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int poll_fun(void *extra, float progress) {
    LOADER_CONTEXT context = (LOADER_CONTEXT)extra;
    if (context->thd->killed) {
        sprintf(context->write_status_msg, "The process has been killed, aborting bulk load.");
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        return ER_ABORTING_CONNECTION;
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    }
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    sprintf(context->write_status_msg, "Loading of data about %.1f%% done", progress*100);
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    thd_proc_info(context->thd, context->write_status_msg);
    return 0;
}


void loader_ai_err_fun(DB *db, int i, int err, DBT *key, DBT *val, void *error_extra) {
    LOADER_CONTEXT context = (LOADER_CONTEXT)error_extra;
    assert(context->ha);
    context->ha->set_loader_error(err);
}

void loader_dup_fun(DB *db, int i, int err, DBT *key, DBT *val, void *error_extra) {
    LOADER_CONTEXT context = (LOADER_CONTEXT)error_extra;
    assert(context->ha);
    context->ha->set_loader_error(err);
    if (err == DB_KEYEXIST) {
        context->ha->set_dup_value_for_pk(key);
    }
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}

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//
// smart DBT callback function for optimize
// in optimize, we want to flatten DB by doing
// a full table scan. Therefore, we don't
// want to actually do anything with the data, hence
// callback does nothing
//
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static int smart_dbt_do_nothing (DBT const *key, DBT  const *row, void *context) {
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  return 0;
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}

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static int smart_dbt_metacallback (DBT const *key, DBT  const *row, void *context) {
    DBT* val = (DBT *)context;
    val->data = my_malloc(row->size, MYF(MY_WME|MY_ZEROFILL));
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    if (val->data == NULL) return ENOMEM;
    memcpy(val->data, row->data, row->size);
    val->size = row->size;
    return 0;
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}

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static int
smart_dbt_callback_rowread_ptquery (DBT const *key, DBT  const *row, void *context) {
    SMART_DBT_INFO info = (SMART_DBT_INFO)context;
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    info->ha->extract_hidden_primary_key(info->keynr, key);
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    return info->ha->read_row_callback(info->buf,info->keynr,row,key);
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}

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//
// Smart DBT callback function in case where we have a covering index
//
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static int
smart_dbt_callback_keyread(DBT const *key, DBT  const *row, void *context) {
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    SMART_DBT_INFO info = (SMART_DBT_INFO)context;
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    info->ha->extract_hidden_primary_key(info->keynr, key);
    info->ha->read_key_only(info->buf,info->keynr,key);
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    return 0;
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}

//
// Smart DBT callback function in case where we do NOT have a covering index
//
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static int
smart_dbt_callback_rowread(DBT const *key, DBT  const *row, void *context) {
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    int error = 0;
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    SMART_DBT_INFO info = (SMART_DBT_INFO)context;
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    info->ha->extract_hidden_primary_key(info->keynr, key);
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    error = info->ha->read_primary_key(info->buf,info->keynr,row,key);
    return error;
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}

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//
// Smart DBT callback function in case where we have a covering index
//
static int
smart_dbt_callback_ir_keyread(DBT const *key, DBT  const *row, void *context) {
    INDEX_READ_INFO ir_info = (INDEX_READ_INFO)context;
    ir_info->cmp = ir_info->smart_dbt_info.ha->prefix_cmp_dbts(ir_info->smart_dbt_info.keynr, ir_info->orig_key, key);
    if (ir_info->cmp) {
        return 0;
    }
    return smart_dbt_callback_keyread(key, row, &ir_info->smart_dbt_info);
}

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static int
smart_dbt_callback_lookup(DBT const *key, DBT  const *row, void *context) {
    INDEX_READ_INFO ir_info = (INDEX_READ_INFO)context;
    ir_info->cmp = ir_info->smart_dbt_info.ha->prefix_cmp_dbts(ir_info->smart_dbt_info.keynr, ir_info->orig_key, key);
    return 0;
}


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//
// Smart DBT callback function in case where we do NOT have a covering index
//
static int
smart_dbt_callback_ir_rowread(DBT const *key, DBT  const *row, void *context) {
    INDEX_READ_INFO ir_info = (INDEX_READ_INFO)context;
    ir_info->cmp = ir_info->smart_dbt_info.ha->prefix_cmp_dbts(ir_info->smart_dbt_info.keynr, ir_info->orig_key, key);
    if (ir_info->cmp) {
        return 0;
    }
    return smart_dbt_callback_rowread(key, row, &ir_info->smart_dbt_info);
}

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//
// macro for Smart DBT callback function, 
// so we do not need to put this long line of code in multiple places
//
#define SMART_DBT_CALLBACK ( this->key_read ? smart_dbt_callback_keyread : smart_dbt_callback_rowread ) 
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#define SMART_DBT_IR_CALLBACK ( this->key_read ? smart_dbt_callback_ir_keyread : smart_dbt_callback_ir_rowread ) 
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//
// macro that modifies read flag for cursor operations depending on whether
// we have preacquired lock or not
//
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#define SET_PRELOCK_FLAG(flg) ((flg) | (range_lock_grabbed ? (use_write_locks ? DB_PRELOCKED_WRITE : DB_PRELOCKED) : 0))
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//
// This method retrieves the value of the auto increment column of a record in MySQL format
// This was basically taken from MyISAM
// Parameters:
//              type - the type of the auto increment column (e.g. int, float, double...)
//              offset - offset into the record where the auto increment column is stored
//      [in]    record - MySQL row whose auto increment value we want to extract
// Returns:
//      The value of the auto increment column in record
//
ulonglong retrieve_auto_increment(uint16 type, uint32 offset,const uchar *record)
{
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    const uchar *key;     /* Key */
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    ulonglong   unsigned_autoinc = 0;  /* Unsigned auto-increment */
    longlong      signed_autoinc = 0;  /* Signed auto-increment */
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    enum { unsigned_type, signed_type } autoinc_type;
    float float_tmp;   /* Temporary variable */
    double double_tmp; /* Temporary variable */

    key = ((uchar *) record) + offset;

    /* Set default autoincrement type */
    autoinc_type = unsigned_type;

    switch (type) {
    case HA_KEYTYPE_INT8:
        signed_autoinc   = (longlong) *(char*)key;
        autoinc_type     = signed_type;
        break;

    case HA_KEYTYPE_BINARY:
        unsigned_autoinc = (ulonglong) *(uchar*) key;
        break;

    case HA_KEYTYPE_SHORT_INT:
        signed_autoinc   = (longlong) sint2korr(key);
        autoinc_type     = signed_type;
        break;

    case HA_KEYTYPE_USHORT_INT:
        unsigned_autoinc = (ulonglong) uint2korr(key);
        break;

    case HA_KEYTYPE_LONG_INT:
        signed_autoinc   = (longlong) sint4korr(key);
        autoinc_type     = signed_type;
        break;

    case HA_KEYTYPE_ULONG_INT:
        unsigned_autoinc = (ulonglong) uint4korr(key);
        break;

    case HA_KEYTYPE_INT24:
        signed_autoinc   = (longlong) sint3korr(key);
        autoinc_type     = signed_type;
        break;

    case HA_KEYTYPE_UINT24:
        unsigned_autoinc = (ulonglong) uint3korr(key);
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    break;
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    case HA_KEYTYPE_LONGLONG:
        signed_autoinc   = sint8korr(key);
        autoinc_type     = signed_type;
        break;

    case HA_KEYTYPE_ULONGLONG:
        unsigned_autoinc = uint8korr(key);
        break;

    /* The remaining two cases should not be used but are included for 
       compatibility */
    case HA_KEYTYPE_FLOAT:                      
        float4get(float_tmp, key);  /* Note: float4get is a macro */
        signed_autoinc   = (longlong) float_tmp;
        autoinc_type     = signed_type;
        break;

    case HA_KEYTYPE_DOUBLE:
        float8get(double_tmp, key); /* Note: float8get is a macro */
        signed_autoinc   = (longlong) double_tmp;
        autoinc_type     = signed_type;
        break;

    default:
        DBUG_ASSERT(0);
        unsigned_autoinc = 0;
    }

    if (signed_autoinc < 0) {
        signed_autoinc = 0;
    }

    return autoinc_type == unsigned_type ?  
           unsigned_autoinc : (ulonglong) signed_autoinc;
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}


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inline bool
is_null_field( TABLE* table, Field* field, const uchar* record) {
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    uint null_offset;
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    bool ret_val;
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    if (!field->null_ptr) {
        ret_val = false;
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        goto exitpt;
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    }
    null_offset = get_null_offset(table,field);
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    ret_val = (record[null_offset] & field->null_bit) ? true: false;

exitpt:
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    return ret_val;
}

inline ulong field_offset(Field* field, TABLE* table) {
    return((ulong) (field->ptr - table->record[0]));
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}

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inline HA_TOKU_ISO_LEVEL tx_to_toku_iso(ulong tx_isolation) {
    if (tx_isolation == ISO_READ_UNCOMMITTED) {
        return hatoku_iso_read_uncommitted;
    }
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    else if (tx_isolation == ISO_READ_COMMITTED) {
        return hatoku_iso_read_committed;
    }
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    else if (tx_isolation == ISO_REPEATABLE_READ) {
        return hatoku_iso_repeatable_read;
    }
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    else {
        return hatoku_iso_serializable;
    }
}

inline u_int32_t toku_iso_to_txn_flag (HA_TOKU_ISO_LEVEL lvl) {
    if (lvl == hatoku_iso_read_uncommitted) {
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        return DB_READ_UNCOMMITTED;
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    }
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    else if (lvl == hatoku_iso_read_committed) {
        return DB_READ_COMMITTED;
    }
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    else if (lvl == hatoku_iso_repeatable_read) {
        return DB_TXN_SNAPSHOT;
    }
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    else {
        return 0;
    }
}

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int filter_key_part_compare (const void* left, const void* right) {
    FILTER_KEY_PART_INFO* left_part= (FILTER_KEY_PART_INFO *)left;
    FILTER_KEY_PART_INFO* right_part = (FILTER_KEY_PART_INFO *)right;
    return left_part->offset - right_part->offset;
}


//
// Be very careful with parameters passed to this function. Who knows
// if key, table have proper info set. I had to verify by checking
// in the debugger.
//
void set_key_filter(MY_BITMAP* key_filter, KEY* key, TABLE* table, bool get_offset_from_keypart) {
    FILTER_KEY_PART_INFO parts[MAX_REF_PARTS];
    uint curr_skip_index = 0;

    for (uint i = 0; i < key->key_parts; i++) {
        //
        // horrendous hack due to bugs in mysql, basically
        // we cannot always reliably get the offset from the same source
        //
        parts[i].offset = get_offset_from_keypart ? key->key_part[i].offset : field_offset(key->key_part[i].field, table);
        parts[i].part_index = i;
    }
    qsort(
        parts, // start of array
        key->key_parts, //num elements
        sizeof(*parts), //size of each element
        filter_key_part_compare
        );

    for (uint i = 0; i < table->s->fields; i++) {
        Field* field = table->field[i];
        uint curr_field_offset = field_offset(field, table);
        if (curr_skip_index < key->key_parts) {
            uint curr_skip_offset = 0;
            curr_skip_offset = parts[curr_skip_index].offset;
            if (curr_skip_offset == curr_field_offset) {
                //
                // we have hit a field that is a portion of the primary key
                //
                uint curr_key_index = parts[curr_skip_index].part_index;
                curr_skip_index++;
                //
                // only choose to continue over the key if the key's length matches the field's length
                // otherwise, we may have a situation where the column is a varchar(10), the
                // key is only the first 3 characters, and we end up losing the last 7 bytes of the
                // column
                //
                TOKU_TYPE toku_type;
                toku_type = mysql_to_toku_type(field);
                switch(toku_type) {
                case(toku_type_blob):
                    break;
                case(toku_type_varbinary):
                case(toku_type_varstring):
                case(toku_type_fixbinary):
                case(toku_type_fixstring):
                    if (key->key_part[curr_key_index].length == field->field_length) {
                        bitmap_set_bit(key_filter,i);
                    }
                    break;
                default:
                    bitmap_set_bit(key_filter,i);
                    break;
                }
            }
        }
    }
}


inline uchar* pack_fixed_field(
    uchar* to_tokudb,
    const uchar* from_mysql,
    u_int32_t num_bytes
    )
{
    switch (num_bytes) {
    case (1):
        memcpy(to_tokudb, from_mysql, 1);
        break;
    case (2):
        memcpy(to_tokudb, from_mysql, 2);
        break;
    case (3):
        memcpy(to_tokudb, from_mysql, 3);
        break;
    case (4):
        memcpy(to_tokudb, from_mysql, 4);
        break;
    case (8):
        memcpy(to_tokudb, from_mysql, 8);
        break;
    default:
        memcpy(to_tokudb, from_mysql, num_bytes);
        break;
    }
    return to_tokudb+num_bytes;
}

inline const uchar* unpack_fixed_field(
    uchar* to_mysql,
    const uchar* from_tokudb,
    u_int32_t num_bytes
    )
{
    switch (num_bytes) {
    case (1):
        memcpy(to_mysql, from_tokudb, 1);
        break;
    case (2):
        memcpy(to_mysql, from_tokudb, 2);
        break;
    case (3):
        memcpy(to_mysql, from_tokudb, 3);
        break;
    case (4):
        memcpy(to_mysql, from_tokudb, 4);
        break;
    case (8):
        memcpy(to_mysql, from_tokudb, 8);
        break;
    default:
        memcpy(to_mysql, from_tokudb, num_bytes);
        break;
    }
    return from_tokudb+num_bytes;
}


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inline uchar* write_var_field(
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    uchar* to_tokudb_offset_ptr, //location where offset data is going to be written
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    uchar* to_tokudb_data, // location where data is going to be written
    uchar* to_tokudb_offset_start, //location where offset starts, IS THIS A BAD NAME????
    const uchar * data, // the data to write
    u_int32_t data_length, // length of data to write
    u_int32_t offset_bytes // number of offset bytes
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    )
{
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    memcpy(to_tokudb_data, data, data_length);
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    //
    // for offset, we pack the offset where the data ENDS!
    //
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    u_int32_t offset = to_tokudb_data + data_length - to_tokudb_offset_start;
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    switch(offset_bytes) {
    case (1):
        to_tokudb_offset_ptr[0] = (uchar)offset;
        break;
    case (2):
        int2store(to_tokudb_offset_ptr,offset);
        break;
    default:
        assert(false);
        break;
    }
    return to_tokudb_data + data_length;
}

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inline u_int32_t get_var_data_length(
    const uchar * from_mysql, 
    u_int32_t mysql_length_bytes 
    ) 
{
    u_int32_t data_length;
    switch(mysql_length_bytes) {
    case(1):
        data_length = from_mysql[0];
        break;
    case(2):
        data_length = uint2korr(from_mysql);
        break;
    default:
        assert(false);
        break;
    }
    return data_length;
}

inline uchar* pack_var_field(
    uchar* to_tokudb_offset_ptr, //location where offset data is going to be written
    uchar* to_tokudb_data, // pointer to where tokudb data should be written
    uchar* to_tokudb_offset_start, //location where data starts, IS THIS A BAD NAME????
    const uchar * from_mysql, // mysql data
    u_int32_t mysql_length_bytes, //number of bytes used to store length in from_mysql
    u_int32_t offset_bytes //number of offset_bytes used in tokudb row
    )
{
    uint data_length = get_var_data_length(from_mysql, mysql_length_bytes);    
    return write_var_field(
        to_tokudb_offset_ptr,
        to_tokudb_data,
        to_tokudb_offset_start,
        from_mysql + mysql_length_bytes,
        data_length,
        offset_bytes
        );
}

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inline void unpack_var_field(
    uchar* to_mysql,
    const uchar* from_tokudb_data,
    u_int32_t from_tokudb_data_len,
    u_int32_t mysql_length_bytes
    )
{
    //
    // store the length
    //
    switch (mysql_length_bytes) {
    case(1):
        to_mysql[0] = (uchar)from_tokudb_data_len;
        break;
    case(2):
        int2store(to_mysql, from_tokudb_data_len);
        break;
    default:
        assert(false);
        break;
    }
    //
    // store the data
    //
    memcpy(to_mysql+mysql_length_bytes, from_tokudb_data, from_tokudb_data_len);
}

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uchar* pack_toku_field_blob(
    uchar* to_tokudb,
    const uchar* from_mysql,
    Field* field
    )
{
    u_int32_t len_bytes = field->row_pack_length();
    u_int32_t length = 0;
    uchar* data_ptr = NULL;
    memcpy(to_tokudb, from_mysql, len_bytes);

    switch (len_bytes) {
    case (1):
        length = (u_int32_t)(*from_mysql);
        break;
    case (2):
        length = uint2korr(from_mysql);
        break;
    case (3):
        length = uint3korr(from_mysql);
        break;
    case (4):
        length = uint4korr(from_mysql);
        break;
    default:
        assert(false);
    }

    if (length > 0) {
        memcpy_fixed((uchar *)(&data_ptr), from_mysql + len_bytes, sizeof(uchar*));
        memcpy(to_tokudb + len_bytes, data_ptr, length);
    }
    return (to_tokudb + len_bytes + length);
}

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static int add_table_to_metadata(const char *name, TABLE* table, DB_TXN* txn) {
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    int error = 0;
    DBT key;
    DBT val;
    uchar hidden_primary_key = (table->s->primary_key >= MAX_KEY);
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    assert(txn);
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    bzero((void *)&key, sizeof(key));
    bzero((void *)&val, sizeof(val));
    key.data = (void *)name;
    key.size = strlen(name) + 1;
    val.data = &hidden_primary_key;
    val.size = sizeof(hidden_primary_key);
    error = metadata_db->put(
        metadata_db,
        txn,
        &key,
        &val,
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        0
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        );
    return error;
}

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static int drop_table_from_metadata(const char *name, DB_TXN* txn) {
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    int error = 0;
    DBT key;
    DBT data;
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    assert(txn);
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    bzero((void *)&key, sizeof(key));
    bzero((void *)&data, sizeof(data));
    key.data = (void *)name;
    key.size = strlen(name) + 1;
    error = metadata_db->del(
        metadata_db, 
        txn, 
        &key , 
        DB_DELETE_ANY
        );
    return error;
}

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static int rename_table_in_metadata(const char *from, const char *to, DB_TXN* txn) {
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    int error = 0;
    DBT from_key;
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    DBT to_key;
    DBT val;
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    assert(txn);
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    bzero((void *)&from_key, sizeof(from_key));
    bzero((void *)&to_key, sizeof(to_key));
    bzero((void *)&val, sizeof(val));
    from_key.data = (void *)from;
    from_key.size = strlen(from) + 1;
    to_key.data = (void *)to;
    to_key.size = strlen(to) + 1;
    
    error = metadata_db->getf_set(
        metadata_db, 
        txn, 
        0, 
        &from_key, 
        smart_dbt_metacallback, 
        &val
        );

    if (error) {
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        goto cleanup;
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    }

    error = metadata_db->put(
        metadata_db,
        txn,
        &to_key,
        &val,
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        0
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        );
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    if (error) {
        goto cleanup;
    }
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    error = metadata_db->del(
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        metadata_db, 
        txn, 
        &from_key, 
        DB_DELETE_ANY
        );
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    if (error) {
        goto cleanup;
    }
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    error = 0;

cleanup:
    my_free(val.data, MYF(MY_ALLOW_ZERO_PTR));

    return error;
}


static int check_table_in_metadata(const char *name, bool* table_found) {
    int error = 0;
    DBT key;
    DB_TXN* txn = NULL;
    pthread_mutex_lock(&tokudb_meta_mutex);
    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) {
        goto cleanup;
    }
    
    bzero((void *)&key, sizeof(key));
    key.data = (void *)name;
    key.size = strlen(name) + 1;
    
    error = metadata_db->getf_set(
        metadata_db, 
        txn, 
        0, 
        &key, 
        smart_dbt_do_nothing, 
        NULL
        );

    if (error == 0) {
        *table_found = true;
    }
    else if (error == DB_NOTFOUND){
        *table_found = false;
        error = 0;
    }

cleanup:
    if (txn) {
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        commit_txn(txn, 0);
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    }
    pthread_mutex_unlock(&tokudb_meta_mutex);
    return error;
}

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int create_tokudb_trx_data_instance(tokudb_trx_data** out_trx) {
    int error;
    tokudb_trx_data* trx = NULL;
    trx = (tokudb_trx_data *) my_malloc(sizeof(*trx), MYF(MY_ZEROFILL));
    if (!trx) {
        error = ENOMEM;
        goto cleanup;
    }

    *out_trx = trx;
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    error = 0;
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cleanup:
    return error;
}

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inline int tokudb_generate_row(
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    DB *dest_db, 
    DB *src_db,
    DBT *dest_key, 
    DBT *dest_val,
    const DBT *src_key, 
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    const DBT *src_val
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    ) 
{
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    int error;

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    DB* curr_db = dest_db;
    uchar* row_desc = NULL;
    u_int32_t desc_size;
    uchar* buff = NULL;
    u_int32_t max_key_len = 0;
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    row_desc = (uchar *)curr_db->descriptor->dbt.data;
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    row_desc += (*(u_int32_t *)row_desc);
    desc_size = (*(u_int32_t *)row_desc) - 4;
    row_desc += 4;
    
    if (is_key_pk(row_desc, desc_size)) {
        if (dest_key->flags == DB_DBT_REALLOC && dest_key->data != NULL) {
            free(dest_key->data);
        }
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        if (dest_val != NULL) {
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            if (dest_val->flags == DB_DBT_REALLOC && dest_val->data != NULL) {
                free(dest_val->data);
            }
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        }
        dest_key->data = src_key->data;
        dest_key->size = src_key->size;
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        dest_key->flags = 0;
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        if (dest_val != NULL) {
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            dest_val->data = src_val->data;
            dest_val->size = src_val->size;
            dest_val->flags = 0;
        }
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        error = 0;
        goto cleanup;
    }
    if (dest_key->flags == DB_DBT_USERMEM) {
        buff = (uchar *)dest_key->data;
    }
    else if (dest_key->flags == DB_DBT_REALLOC) {
        max_key_len = max_key_size_from_desc(row_desc, desc_size);
        max_key_len += src_key->size;
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        if (max_key_len > dest_key->ulen) {
            void* old_ptr = dest_key->data;
            void* new_ptr = NULL;
            new_ptr = realloc(old_ptr, max_key_len);
            assert(new_ptr);
            dest_key->data = new_ptr;
            dest_key->ulen = max_key_len;
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        }
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        buff = (uchar *)dest_key->data;
        assert(buff != NULL && max_key_len > 0);
    }
    else {
        assert(false);
    }

    dest_key->size = pack_key_from_desc(
        buff,
        row_desc,
        desc_size,
        src_key,
        src_val
        );
    assert(dest_key->ulen >= dest_key->size);
    if (tokudb_debug & TOKUDB_DEBUG_CHECK_KEY && !max_key_len) {
        max_key_len = max_key_size_from_desc(row_desc, desc_size);
        max_key_len += src_key->size;
    }
    if (max_key_len) {
        assert(max_key_len >= dest_key->size);
    }

    row_desc += desc_size;
    desc_size = (*(u_int32_t *)row_desc) - 4;
    row_desc += 4;
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    if (dest_val != NULL) {
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        if (!is_key_clustering(row_desc, desc_size)) {
            dest_val->size = 0;
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        }
        else {
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            uchar* buff = NULL;
            if (dest_val->flags == DB_DBT_USERMEM) {
                buff = (uchar *)dest_val->data;
            }
            else if (dest_val->flags == DB_DBT_REALLOC){
                if (dest_val->ulen < src_val->size) {
                    void* old_ptr = dest_val->data;
                    void* new_ptr = NULL;
                    new_ptr = realloc(old_ptr, src_val->size);
                    assert(new_ptr);
                    dest_val->data = new_ptr;
                    dest_val->ulen = src_val->size;
                }
                buff = (uchar *)dest_val->data;
                assert(buff != NULL);
            }
            else {
                assert(false);
            }
            dest_val->size = pack_clustering_val_from_desc(
                buff,
                row_desc,
                desc_size,
                src_val
                );
            assert(dest_val->ulen >= dest_val->size);
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        }
    }
    error = 0;
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cleanup:
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    return error;
}

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int generate_row_for_del(
    DB *dest_db, 
    DB *src_db,
    DBT *dest_key,
    const DBT *src_key, 
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    const DBT *src_val
    )
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{
    return tokudb_generate_row(
        dest_db,
        src_db,
        dest_key,
        NULL,
        src_key,
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        src_val
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        );
}


int generate_row_for_put(
    DB *dest_db, 
    DB *src_db,
    DBT *dest_key, 
    DBT *dest_val,
    const DBT *src_key, 
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    const DBT *src_val
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    ) 
{
    return tokudb_generate_row(
        dest_db,
        src_db,
        dest_key,
        dest_val,
        src_key,
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        src_val
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        );
}

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ha_tokudb::ha_tokudb(handlerton * hton, TABLE_SHARE * table_arg):handler(hton, table_arg) 
    // flags defined in sql\handler.h
{
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    int_table_flags = HA_REC_NOT_IN_SEQ  | HA_NULL_IN_KEY | HA_CAN_INDEX_BLOBS | HA_PRIMARY_KEY_IN_READ_INDEX | 
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                    HA_FILE_BASED | HA_AUTO_PART_KEY | HA_TABLE_SCAN_ON_INDEX;
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    alloc_ptr = NULL;
    rec_buff = NULL;
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    rec_update_buff = NULL;
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    transaction = NULL;
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    is_fast_alter_running = false;
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    cursor = NULL;
    fixed_cols_for_query = NULL;
    var_cols_for_query = NULL;
    num_fixed_cols_for_query = 0;
    num_var_cols_for_query = 0;
    unpack_entire_row = true;
    read_blobs = false;
    read_key = false;
    added_rows = 0;
    deleted_rows = 0;
    last_dup_key = UINT_MAX;
    using_ignore = 0;
    last_cursor_error = 0;
    range_lock_grabbed = false;
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    blob_buff = NULL;
    num_blob_bytes = 0;
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    delay_updating_ai_metadata = false;
    ai_metadata_update_required = false;
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    read_lock_wait_time = 4000;
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    bzero(mult_key_buff, sizeof(mult_key_buff));
    bzero(mult_rec_buff, sizeof(mult_rec_buff));
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    bzero(mult_key_dbt, sizeof(mult_key_dbt));
    bzero(mult_rec_dbt, sizeof(mult_rec_dbt));
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    loader = NULL;
    abort_loader = false;
    bzero(&lc, sizeof(lc));
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    lock.type = TL_IGNORE;
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    for (u_int32_t i = 0; i < MAX_KEY+1; i++) {
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        mult_put_flags[i] = 0;
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        mult_del_flags[i] = DB_DELETE_ANY;
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        mult_dbt_flags[i] = DB_DBT_REALLOC;
    }
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    num_DBs_locked_in_bulk = false;
    lock_count = 0;
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}

//
// states if table has an auto increment column, if so, sets index where auto inc column is to index
// Parameters:
//      [out]   index - if auto inc exists, then this param is set to where it exists in table, if not, then unchanged
// Returns:
//      true if auto inc column exists, false otherwise
//
bool ha_tokudb::has_auto_increment_flag(uint* index) {
    //
    // check to see if we have auto increment field
    //
    bool ai_found = false;
    uint ai_index = 0;
    for (uint i = 0; i < table_share->fields; i++, ai_index++) {
        Field* field = table->field[i];
        if (field->flags & AUTO_INCREMENT_FLAG) {
            ai_found = true;
            *index = ai_index;
            break;
        }
    }
    return ai_found;
}

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int open_status_dictionary(DB** ptr, const char* name, DB_TXN* txn) {
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    int error;
    char* newname = NULL;
    uint open_mode = DB_THREAD;
    newname = (char *)my_malloc(
        get_max_dict_name_path_length(name), 
        MYF(MY_WME)
        );
    if (newname == NULL) {
        error = ENOMEM;
        goto cleanup;
    }
    make_name(newname, name, "status");
    if (tokudb_debug & TOKUDB_DEBUG_OPEN) {
        TOKUDB_TRACE("open:%s\n", newname);
    }
    error = db_create(ptr, db_env, 0);
    if (error) { goto cleanup; }
    
    error = (*ptr)->open((*ptr), txn, newname, NULL, DB_BTREE, open_mode, 0);
    if (error) { 
        goto cleanup; 
    }
cleanup:
    if (error) {
        if (*ptr) {
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            int r = (*ptr)->close(*ptr, 0);
            assert(r==0);
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            *ptr = NULL;
        }
    }
    my_free(newname, MYF(MY_ALLOW_ZERO_PTR));
    return error;
}

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int ha_tokudb::open_main_dictionary(const char* name, bool is_read_only, DB_TXN* txn) {
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    int error;    
    char* newname = NULL;
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    uint open_flags = (is_read_only ? DB_RDONLY : 0) | DB_THREAD;
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    assert(share->file == NULL);
    assert(share->key_file[primary_key] == NULL);

    newname = (char *)my_malloc(
        get_max_dict_name_path_length(name),
        MYF(MY_WME|MY_ZEROFILL)
        );
    if (newname == NULL) { 
        error = ENOMEM;
        goto exit;
    }
    make_name(newname, name, "main");

    error = db_create(&share->file, db_env, 0);
    if (error) {
        goto exit;
    }
    share->key_file[primary_key] = share->file;
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    error = share->file->open(share->file, txn, newname, NULL, DB_BTREE, open_flags, 0);
    if (error) {
        goto exit;
    }
    
    if (tokudb_debug & TOKUDB_DEBUG_OPEN) {
        TOKUDB_TRACE("open:%s:file=%p\n", newname, share->file);
    }
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    error = 0;
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exit:
    if (error) {
        if (share->file) {
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            int r = share->file->close(
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                share->file,
                0
                );
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            assert(r==0);
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            share->file = NULL;
            share->key_file[primary_key] = NULL;
        }
    }
    my_free(newname, MYF(MY_ALLOW_ZERO_PTR));
    return error;
}
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//
// Open a secondary table, the key will be a secondary index, the data will be a primary key
//
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int ha_tokudb::open_secondary_dictionary(DB** ptr, KEY* key_info, const char* name, bool is_read_only, DB_TXN* txn) {
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    int error = ENOSYS;
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    char dict_name[MAX_DICT_NAME_LEN];
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    uint open_flags = (is_read_only ? DB_RDONLY : 0) | DB_THREAD;
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    char* newname = NULL;
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    uint newname_len = 0;
    
    sprintf(dict_name, "key-%s", key_info->name);

    newname_len = get_max_dict_name_path_length(name);
    newname = (char *)my_malloc(newname_len, MYF(MY_WME|MY_ZEROFILL));
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    if (newname == NULL) {
        error = ENOMEM;
        goto cleanup;
    }
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    make_name(newname, name, dict_name);
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    if ((error = db_create(ptr, db_env, 0))) {
        my_errno = error;
        goto cleanup;
    }
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    if ((error = (*ptr)->open(*ptr, txn, newname, NULL, DB_BTREE, open_flags, 0))) {
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        my_errno = error;
        goto cleanup;
    }
    if (tokudb_debug & TOKUDB_DEBUG_OPEN) {
        TOKUDB_TRACE("open:%s:file=%p\n", newname, *ptr);
    }
cleanup:
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    if (error) {
        if (*ptr) {
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            int r = (*ptr)->close(*ptr, 0);
            assert(r==0);
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            *ptr = NULL;
        }
    }
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    my_free(newname, MYF(MY_ALLOW_ZERO_PTR));
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    return error;
}

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int initialize_col_pack_info(KEY_AND_COL_INFO* kc_info, TABLE_SHARE* table_share, uint keynr) {
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    int error = ENOSYS;
    //
    // set up the cp_info
    //
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    assert(kc_info->cp_info[keynr] == NULL);
    kc_info->cp_info[keynr] = (COL_PACK_INFO *)my_malloc(
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        table_share->fields*sizeof(COL_PACK_INFO), 
        MYF(MY_WME | MY_ZEROFILL)
        );
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    if (kc_info->cp_info[keynr] == NULL) {
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        error = ENOMEM;
        goto exit;
    }
    {
    u_int32_t curr_fixed_offset = 0;
    u_int32_t curr_var_index = 0;
    for (uint j = 0; j < table_share->fields; j++) {
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        COL_PACK_INFO* curr = &kc_info->cp_info[keynr][j];
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        //
        // need to set the offsets / indexes
        // offsets are calculated AFTER the NULL bytes
        //
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        if (!bitmap_is_set(&kc_info->key_filters[keynr],j)) {
            if (kc_info->field_lengths[j]) {
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                curr->col_pack_val = curr_fixed_offset;
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                curr_fixed_offset += kc_info->field_lengths[j];
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            }
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            else if (kc_info->length_bytes[j]) {
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                curr->col_pack_val = curr_var_index;
                curr_var_index++;
            }
        }
    }
    
    //
    // set up the mcp_info
    //
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    kc_info->mcp_info[keynr].fixed_field_size = get_fixed_field_size(
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        kc_info,
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        table_share,
        keynr
        );
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    kc_info->mcp_info[keynr].len_of_offsets = get_len_of_offsets(
        kc_info,
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        table_share,
        keynr
        );

    error = 0;
    }
exit:
    return error;
}

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// reset the kc_info state at keynr
static void reset_key_and_col_info(KEY_AND_COL_INFO *kc_info, uint keynr) {
    bitmap_clear_all(&kc_info->key_filters[keynr]);
    my_free(kc_info->cp_info[keynr], MYF(MY_ALLOW_ZERO_PTR));
    kc_info->cp_info[keynr] = NULL;
    kc_info->mcp_info[keynr] = (MULTI_COL_PACK_INFO) { 0, 0 };
}

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int initialize_key_and_col_info(TABLE_SHARE* table_share, TABLE* table, KEY_AND_COL_INFO* kc_info, uint hidden_primary_key, uint primary_key) {
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    int error = 0;
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    u_int32_t curr_blob_field_index = 0;
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    u_int32_t max_var_bytes = 0;
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    //
    // fill in the field lengths. 0 means it is a variable sized field length
    // fill in length_bytes, 0 means it is fixed or blob
    //
    for (uint i = 0; i < table_share->fields; i++) {
        Field* field = table_share->field[i];
        TOKU_TYPE toku_type = mysql_to_toku_type(field);
        uint32 pack_length = 0;
        switch (toku_type) {
        case toku_type_int:
        case toku_type_double:
        case toku_type_float:
        case toku_type_fixbinary:
        case toku_type_fixstring:
            pack_length = field->pack_length();
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            assert(pack_length < 1<<16);
            kc_info->field_lengths[i] = (u_int16_t)pack_length;
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            kc_info->length_bytes[i] = 0;
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            break;
        case toku_type_blob:
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            kc_info->field_lengths[i] = 0;
            kc_info->length_bytes[i] = 0;
            kc_info->blob_fields[curr_blob_field_index] = i;
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            curr_blob_field_index++;
            break;
        case toku_type_varstring:
        case toku_type_varbinary:
            //
            // meaning it is variable sized
            //
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            kc_info->field_lengths[i] = 0;
            kc_info->length_bytes[i] = (uchar)((Field_varstring *)field)->length_bytes;
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            max_var_bytes += field->field_length;
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            break;
        default:
            assert(false);
        }
    }
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    kc_info->num_blobs = curr_blob_field_index;
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    //
    // initialize share->num_offset_bytes
    // because MAX_REF_LENGTH is 65536, we
    // can safely set num_offset_bytes to 1 or 2
    //
    if (max_var_bytes < 256) {
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        kc_info->num_offset_bytes = 1;
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    }
    else {
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        kc_info->num_offset_bytes = 2;
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    }


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    for (uint i = 0; i < table_share->keys + test(hidden_primary_key); i++) {
        //
        // do the cluster/primary key filtering calculations
        //
        if (! (i==primary_key && hidden_primary_key) ){        
            if ( i == primary_key ) {
                set_key_filter(
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                    &kc_info->key_filters[primary_key],
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                    &table_share->key_info[primary_key],
                    table,
                    true
                    );
            }
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            else {
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                set_key_filter(
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                    &kc_info->key_filters[i],
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                    &table_share->key_info[i],
                    table,
                    true
                    );
                if (!hidden_primary_key) {
                    set_key_filter(
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                        &kc_info->key_filters[i],
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                        &table_share->key_info[primary_key],
                        table,
                        true
                        );
                }
            }
        }
        if (i == primary_key || table_share->key_info[i].flags & HA_CLUSTERING) {
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            error = initialize_col_pack_info(kc_info,table_share,i);
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            if (error) {
                goto exit;
            }
        }

    }
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exit:
    return error;
}
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bool ha_tokudb::can_replace_into_be_fast(TABLE_SHARE* table_share, KEY_AND_COL_INFO* kc_info, uint pk) {
    uint curr_num_DBs = table_share->keys + test(hidden_primary_key);
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    bool ret_val;
    if (curr_num_DBs == 1) {
        ret_val = true;
        goto exit;
    }
    ret_val = true;
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    for (uint curr_index = 0; curr_index < table_share->keys; curr_index++) {
        if (curr_index == pk) continue;
        KEY* curr_key_info = &table_share->key_info[curr_index];
        for (uint i = 0; i < curr_key_info->key_parts; i++) {
            uint16 curr_field_index = curr_key_info->key_part[i].field->field_index;
            if (!bitmap_is_set(&kc_info->key_filters[curr_index],curr_field_index)) {
                ret_val = false;
                goto exit;
            }
            if (bitmap_is_set(&kc_info->key_filters[curr_index], curr_field_index) &&
                !bitmap_is_set(&kc_info->key_filters[pk], curr_field_index)) {
                ret_val = false;
                goto exit;
            }
            
        }
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    }
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exit:
    return ret_val;
}
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int ha_tokudb::initialize_share(
    const char* name,
    int mode
    )
{
    int error = 0;
    u_int64_t num_rows = 0;
    bool table_exists;
    DBUG_PRINT("info", ("share->use_count %u", share->use_count));

    table_exists = true;
    error = check_table_in_metadata(name, &table_exists);

    if (error) {
        goto exit;
    }
    if (!table_exists) {
        sql_print_error("table %s does not exist in metadata, was it moved from someplace else? Not opening table", name);
        error = HA_ADMIN_FAILED;
        goto exit;
    }
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    error = get_status();
    if (error) {
        goto exit;
    }
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    if (share->version != HA_TOKU_VERSION) {
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        error = ENOSYS;
        goto exit;
    }

    //
    // verify frm file is what we expect it to be
    // only for tables that are not partitioned
    //
    if (table->part_info == NULL) {
        error = verify_frm_data(table->s->path.str);
        if (error) {
            goto exit;
        }
    }
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    error = initialize_key_and_col_info(
        table_share,
        table, 
        &share->kc_info,
        hidden_primary_key,
        primary_key
        );
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    if (error) { goto exit; }
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    error = open_main_dictionary(name, mode == O_RDONLY, NULL);
    if (error) { goto exit; }

    share->has_unique_keys = false;
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    /* Open other keys;  These are part of the share structure */
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    for (uint i = 0; i < table_share->keys + test(hidden_primary_key); i++) {
        if (table_share->key_info[i].flags & HA_NOSAME) {
            share->has_unique_keys = true;
        }
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        if (table_share->key_info[i].flags & HA_CLUSTERING) {
            share->rec_has_buff[i] = true;
        }
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        if (i != primary_key) {
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            error = open_secondary_dictionary(
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                &share->key_file[i],
                &table_share->key_info[i],
                name,
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                mode == O_RDONLY,
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                NULL
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                );
            if (error) {
                goto exit;
            }
        }
    }
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    share->replace_into_fast = can_replace_into_be_fast(
        table_share, 
        &share->kc_info, 
        primary_key
        );
        
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    if (!hidden_primary_key) {
        //
        // We need to set the ref_length to start at 5, to account for
        // the "infinity byte" in keys, and for placing the DBT size in the first four bytes
        //
        ref_length = sizeof(u_int32_t) + sizeof(uchar);
        KEY_PART_INFO *key_part = table->key_info[primary_key].key_part;
        KEY_PART_INFO *end = key_part + table->key_info[primary_key].key_parts;
        for (; key_part != end; key_part++) {
            ref_length += key_part->field->max_packed_col_length(key_part->length);
        }
        share->status |= STATUS_PRIMARY_KEY_INIT;
    }
    share->ref_length = ref_length;

1685
    error = estimate_num_rows(share->file,&num_rows, NULL);
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    //
    // estimate_num_rows should not fail under normal conditions
    //
    if (error == 0) {
        share->rows = num_rows;
    }
    else {
        goto exit;
    }
    //
    // initialize auto increment data
    //
    share->has_auto_inc = has_auto_increment_flag(&share->ai_field_index);
    if (share->has_auto_inc) {
        init_auto_increment();
    }

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    if (may_table_be_empty()) {
        share->try_table_lock = true;
    }
    else {
        share->try_table_lock = false;
    }

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    share->num_DBs = table_share->keys + test(hidden_primary_key);

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    error = 0;
exit:
    return error;
}

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//
// Creates and opens a handle to a table which already exists in a tokudb
// database.
// Parameters:
//      [in]   name - table name
//             mode - seems to specify if table is read only
//             test_if_locked - unused
// Returns:
//      0 on success
//      1 on error
//
1730
int ha_tokudb::open(const char *name, int mode, uint test_if_locked) {
1731
    TOKUDB_DBUG_ENTER("ha_tokudb::open %p %s", this, name);
1732

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    int error = 0;
    int ret_val = 0;
1735
    uint curr_num_DBs = 0;
1736

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    transaction = NULL;
    cursor = NULL;

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    /* Open primary key */
    hidden_primary_key = 0;
    if ((primary_key = table_share->primary_key) >= MAX_KEY) {
        // No primary key
        primary_key = table_share->keys;
        key_used_on_scan = MAX_KEY;
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        hidden_primary_key = TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH;
        ref_length = TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH + sizeof(u_int32_t);
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    } 
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    else {
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        key_used_on_scan = primary_key;
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    }
1753
    curr_num_DBs = table_share->keys + test(hidden_primary_key);
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1755
    /* Need some extra memory in case of packed keys */
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    // the "+ 1" is for the first byte that states +/- infinity
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    // multiply everything by 2 to account for clustered keys having a key and primary key together
    max_key_length = 2*(table_share->max_key_length + MAX_REF_PARTS * 3 + sizeof(uchar));
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    alloc_ptr = my_multi_malloc(MYF(MY_WME),
        &key_buff, max_key_length, 
        &key_buff2, max_key_length, 
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        &key_buff3, max_key_length, 
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        &primary_key_buff, (hidden_primary_key ? 0 : max_key_length),
        &fixed_cols_for_query, table_share->fields*sizeof(u_int32_t),
        &var_cols_for_query, table_share->fields*sizeof(u_int32_t),
        NullS
        );
    if (alloc_ptr == NULL) {
        ret_val = 1;
        goto exit;
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    }

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    alloced_rec_buff_length = table_share->rec_buff_length + table_share->fields;
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    rec_buff = (uchar *) my_malloc(alloced_rec_buff_length, MYF(MY_WME));
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    if (rec_buff == NULL) {
        ret_val = 1;
        goto exit;
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    }
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    alloced_update_rec_buff_length = alloced_rec_buff_length;
    rec_update_buff = (uchar *) my_malloc(alloced_update_rec_buff_length, MYF(MY_WME));
    if (rec_update_buff == NULL) {
        ret_val = 1;
        goto exit;
    }

    for (u_int32_t i = 0; i < sizeof(mult_key_buff)/sizeof(mult_key_buff[0]); i++) {
1788 1789
        mult_key_buff[i] = (uchar *)my_malloc(max_key_length, MYF(MY_WME));
        assert(mult_key_buff[i] != NULL);
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        mult_key_dbt[i].ulen = max_key_length;
        mult_key_dbt[i].flags = DB_DBT_USERMEM;
        mult_key_dbt[i].data = mult_key_buff[i];
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    }

    for (u_int32_t i = 0; i < curr_num_DBs; i++) {
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        if (table_share->key_info[i].flags & HA_CLUSTERING) {
            mult_rec_buff[i] = (uchar *) my_malloc(alloced_rec_buff_length, MYF(MY_WME));
            assert(mult_rec_buff[i]);
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            mult_rec_dbt[i].ulen = alloced_rec_buff_length;
            mult_rec_dbt[i].flags = DB_DBT_USERMEM;
            mult_rec_dbt[i].data = mult_rec_buff[i];
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        }
    }
    alloced_mult_rec_buff_length = alloced_rec_buff_length;

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    /* Init shared structure */
    share = get_share(name, table_share);
    if (share == NULL) {
        ret_val = 1;
        goto exit;
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    }

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    thr_lock_data_init(&share->lock, &lock, NULL);

    /* Fill in shared structure, if needed */
    pthread_mutex_lock(&share->mutex);
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    if (tokudb_debug & TOKUDB_DEBUG_OPEN) {
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        TOKUDB_TRACE("tokudbopen:%p:share=%p:file=%p:table=%p:table->s=%p:%d\n", 
                     this, share, share->file, table, table->s, share->use_count);
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    }
1821
    if (!share->use_count++) {
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        ret_val = initialize_share(
            name,
            mode
            );
        if (ret_val) {
1827
            free_share(share, 1);
1828
            goto exit;
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        }
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    }
    ref_length = share->ref_length;     // If second open
    pthread_mutex_unlock(&share->mutex);

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    key_read = false;
1835
    stats.block_size = 1<<20;    // QQQ Tokudb DB block size
1836

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    init_hidden_prim_key_info();

1839 1840
    info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);

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exit:
    if (ret_val) {
        my_free(alloc_ptr, MYF(MY_ALLOW_ZERO_PTR));
        alloc_ptr = NULL;
        my_free(rec_buff, MYF(MY_ALLOW_ZERO_PTR));
        rec_buff = NULL;
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        my_free(rec_update_buff, MYF(MY_ALLOW_ZERO_PTR));
        rec_update_buff = NULL;
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        for (u_int32_t i = 0; i < sizeof(mult_rec_buff)/sizeof(mult_rec_buff[0]); i++) {
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            my_free(mult_rec_buff[i], MYF(MY_ALLOW_ZERO_PTR));
        }
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        for (u_int32_t i = 0; i < sizeof(mult_key_buff)/sizeof(mult_key_buff[0]); i++) {
            my_free(mult_key_buff[i], MYF(MY_ALLOW_ZERO_PTR));
        }
1855
        
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        if (error) {
            my_errno = error;
        }
    }
    TOKUDB_DBUG_RETURN(ret_val);
1861 1862
}

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//
// estimate the number of rows in a DB
// Parameters:
//      [in]    db - DB whose number of rows will be estimated
//      [out]   num_rows - number of estimated rows in db
// Returns:
//      0 on success
//      error otherwise
//
1872
int ha_tokudb::estimate_num_rows(DB* db, u_int64_t* num_rows, DB_TXN* txn) {
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    DBT key;
    DBT data;
    int error = ENOSYS;
    DBC* crsr = NULL;
    u_int64_t less, equal, greater;
    int is_exact;
    bool do_commit = false;
1880
    DB_TXN* txn_to_use = NULL;
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    bzero((void *)&key, sizeof(key));
    bzero((void *)&data, sizeof(data));

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    if (txn == NULL) {
        error = db_env->txn_begin(db_env, 0, &txn_to_use, DB_READ_UNCOMMITTED);
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        if (error) goto cleanup;
        do_commit = true;
    }
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    else {
        txn_to_use = txn;
    }
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1894
    error = db->cursor(db, txn_to_use, &crsr, 0);
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    if (error) { goto cleanup; }

    //
    // get the first element, then estimate number of records
    // by calling key_range64 on the first element
    //
    error = crsr->c_get(crsr, &key, &data, DB_FIRST);
    if (error == DB_NOTFOUND) {
        *num_rows = 0;
        error = 0;
        goto cleanup;
    }
    else if (error) { goto cleanup; }

    error = db->key_range64(
        db, 
1911
        txn_to_use, 
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        &key, 
        &less,
        &equal,
        &greater,
        &is_exact
        );
    if (error) {
        goto cleanup;
    }


    *num_rows = equal + greater;
    error = 0;
cleanup:
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    if (crsr != NULL) {
1927 1928
        int r = crsr->c_close(crsr);
        assert(r==0);
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        crsr = NULL;
    }
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    if (do_commit) {
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        commit_txn(txn_to_use, 0);
        txn_to_use = NULL;
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    }
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    return error;
}

1938

1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
int ha_tokudb::write_to_status(DB* db, HA_METADATA_KEY curr_key_data, void* data, uint size, DB_TXN* txn ){
    return write_metadata(db, &curr_key_data, sizeof(curr_key_data), data, size, txn);
}


int ha_tokudb::remove_metadata(DB* db, void* key_data, uint key_size, DB_TXN* transaction){
    int error;
    DBT key;
    DB_TXN* txn = NULL;
    bool do_commit = false;
    //
    // transaction to be used for putting metadata into status.tokudb
    //
    if (transaction == NULL) {
        error = db_env->txn_begin(db_env, 0, &txn, 0);
        if (error) { 
            goto cleanup;
        }
        do_commit = true;
    }
    else {
        txn = transaction;
    }

    bzero(&key, sizeof(key));
    key.data = key_data;
    key.size = key_size;
    error = db->del(db, txn, &key, DB_DELETE_ANY);
    if (error) { 
        goto cleanup; 
    }
    
    error = 0;
cleanup:
    if (do_commit && txn) {
        if (!error) {
            commit_txn(txn, DB_TXN_NOSYNC);
        }
        else {
            abort_txn(txn);
        }
    }
    return error;
1982 1983
}

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//
// helper function to write a piece of metadata in to status.tokudb
//
1987
int ha_tokudb::write_metadata(DB* db, void* key_data, uint key_size, void* val_data, uint val_size, DB_TXN* transaction ){
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    int error;
    DBT key;
    DBT value;
    DB_TXN* txn = NULL;
1992
    bool do_commit = false;
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    //
    // transaction to be used for putting metadata into status.tokudb
    //
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    if (transaction == NULL) {
        error = db_env->txn_begin(db_env, 0, &txn, 0);
        if (error) { 
            goto cleanup;
        }
        do_commit = true;
    }
    else {
        txn = transaction;
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    }

    bzero(&key, sizeof(key));
    bzero(&value, sizeof(value));
2009 2010 2011 2012
    key.data = key_data;
    key.size = key_size;
    value.data = val_data;
    value.size = val_size;
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    error = db->put(db, txn, &key, &value, 0);
    if (error) { 
        goto cleanup; 
    }
    
    error = 0;
cleanup:
2020
    if (do_commit && txn) {
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        if (!error) {
2022
            commit_txn(txn, DB_TXN_NOSYNC);
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        }
        else {
2025
            abort_txn(txn);
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        }
    }
    return error;
}

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int ha_tokudb::write_frm_data(DB* db, DB_TXN* txn, const char* frm_name) {
    uchar* frm_data = NULL;
    size_t frm_len = 0;
    int error = 0;
    TOKUDB_DBUG_ENTER("ha_tokudb::write_frm_data, %s", frm_name);

    error = readfrm(frm_name,&frm_data,&frm_len);
    if (error) { goto cleanup; }
    
    error = write_to_status(db,hatoku_frm_data,frm_data,(uint)frm_len, txn);
    if (error) { goto cleanup; }

    error = 0;
cleanup:
    my_free(frm_data, MYF(MY_ALLOW_ZERO_PTR));
    TOKUDB_DBUG_RETURN(error);
}

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static int
smart_dbt_callback_verify_frm (DBT const *key, DBT  const *row, void *context) {
    DBT* stored_frm = (DBT *)context;
    stored_frm->size = row->size;
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    stored_frm->data = (uchar *)my_malloc(row->size, MYF(MY_WME));
    assert(stored_frm->data);
    memcpy(stored_frm->data, row->data, row->size);
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    return 0;
}

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int ha_tokudb::verify_frm_data(const char* frm_name) {
    uchar* mysql_frm_data = NULL;
    size_t mysql_frm_len = 0;
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    DBT key, stored_frm;
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    int error = 0;
    DB_TXN* txn = NULL;
    HA_METADATA_KEY curr_key = hatoku_frm_data;
    TOKUDB_DBUG_ENTER("ha_tokudb::verify_frm_data %s", frm_name);

    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) { goto cleanup; }

    bzero(&key, sizeof(key));
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    bzero(&stored_frm, sizeof(&stored_frm));
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    // get the frm data from MySQL
    error = readfrm(frm_name,&mysql_frm_data,&mysql_frm_len);
    if (error) { goto cleanup; }

    key.data = &curr_key;
    key.size = sizeof(curr_key);
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    error = share->status_block->getf_set(
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        share->status_block, 
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        txn,
        0,
2083
        &key, 
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        smart_dbt_callback_verify_frm, 
        &stored_frm
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        );
    if (error == DB_NOTFOUND) {
        // if not found, write it
        error = write_frm_data(
            share->status_block,
            txn,
            frm_name
            );
        goto cleanup;
    }
    else if (error) {
        goto cleanup;
    }

2100 2101
    if (stored_frm.size != mysql_frm_len || 
        memcmp(stored_frm.data, mysql_frm_data, stored_frm.size))
2102 2103 2104 2105
    {
        error = HA_ERR_TABLE_DEF_CHANGED;
        goto cleanup;
    }
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    error = 0;
cleanup:
    if (txn) {
        commit_txn(txn, 0);
    }
    my_free(mysql_frm_data, MYF(MY_ALLOW_ZERO_PTR));
2113
    my_free(stored_frm.data, MYF(MY_ALLOW_ZERO_PTR));
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    TOKUDB_DBUG_RETURN(error);
}
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//
// Updates status.tokudb with a new max value used for the auto increment column
// Parameters:
//      [in]    db - this will always be status.tokudb
//              val - value to store
//  Returns:
//      0 on success, error otherwise
//
//
int ha_tokudb::update_max_auto_inc(DB* db, ulonglong val){
2127
    return write_to_status(db,hatoku_max_ai,&val,sizeof(val), NULL);
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}

//
// Writes the initial auto increment value, as specified by create table
// so if a user does "create table t1 (a int auto_increment, primary key (a)) auto_increment=100",
// then the value 100 will be stored here in val
// Parameters:
//      [in]    db - this will always be status.tokudb
//              val - value to store
//  Returns:
//      0 on success, error otherwise
//
//
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int ha_tokudb::write_auto_inc_create(DB* db, ulonglong val, DB_TXN* txn){
    return write_to_status(db,hatoku_ai_create_value,&val,sizeof(val), txn);
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}
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//
// Closes a handle to a table. 
//
2149
int ha_tokudb::close(void) {
2150
    TOKUDB_DBUG_ENTER("ha_tokudb::close %p", this);
2151
    TOKUDB_DBUG_RETURN(__close(0));
2152 2153 2154
}

int ha_tokudb::__close(int mutex_is_locked) {
2155
    TOKUDB_DBUG_ENTER("ha_tokudb::__close %p", this);
2156
    if (tokudb_debug & TOKUDB_DEBUG_OPEN) 
2157
        TOKUDB_TRACE("close:%p\n", this);
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    my_free(rec_buff, MYF(MY_ALLOW_ZERO_PTR));
2159
    my_free(rec_update_buff, MYF(MY_ALLOW_ZERO_PTR));
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    my_free(blob_buff, MYF(MY_ALLOW_ZERO_PTR));
2161
    my_free(alloc_ptr, MYF(MY_ALLOW_ZERO_PTR));
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    for (u_int32_t i = 0; i < sizeof(mult_key_buff)/sizeof(mult_key_buff[0]); i++) {
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        my_free(mult_key_buff[i], MYF(MY_ALLOW_ZERO_PTR));
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    }
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    for (u_int32_t i = 0; i < (sizeof(mult_rec_buff)/sizeof(mult_rec_buff[0])); i++) {
2166 2167
        my_free(mult_rec_buff[i], MYF(MY_ALLOW_ZERO_PTR));
    }
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    rec_buff = NULL;
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    rec_update_buff = NULL;
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    alloc_ptr = NULL;
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    ha_tokudb::reset();
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    TOKUDB_DBUG_RETURN(free_share(share, mutex_is_locked));
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}

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//
// Reallocate record buffer (rec_buff) if needed
// If not needed, does nothing
// Parameters:
//          length - size of buffer required for rec_buff
//
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bool ha_tokudb::fix_rec_buff_for_blob(ulong length) {
2182
    if (!rec_buff || (length > alloced_rec_buff_length)) {
2183
        uchar *newptr;
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        if (!(newptr = (uchar *) my_realloc((void *) rec_buff, length, MYF(MY_ALLOW_ZERO_PTR))))
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            return 1;
        rec_buff = newptr;
        alloced_rec_buff_length = length;
    }
    return 0;
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}

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//
// Reallocate record buffer (rec_buff) if needed
// If not needed, does nothing
// Parameters:
//          length - size of buffer required for rec_buff
//
bool ha_tokudb::fix_rec_update_buff_for_blob(ulong length) {
    if (!rec_update_buff || (length > alloced_update_rec_buff_length)) {
        uchar *newptr;
        if (!(newptr = (uchar *) my_realloc((void *) rec_update_buff, length, MYF(MY_ALLOW_ZERO_PTR))))
            return 1;
        rec_update_buff= newptr;
        alloced_update_rec_buff_length = length;
    }
    return 0;
}


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void ha_tokudb::handle_rec_buff_for_hot_index() {
    uint curr_num_DBs = table->s->keys + test(hidden_primary_key);
    if (share->num_DBs > curr_num_DBs) {
        for (u_int32_t i = curr_num_DBs; i < share->num_DBs; i++) {
            // this is the case where a hot index came along, but we have not yet created/
            // a buffer for its val (only needed for clustering keys, which sets share->rec_has_buff[i])
            // In this case, we must create a buffer for it
            if (share->rec_has_buff[i] && mult_rec_buff[i] == NULL) {
                uchar *newptr;
                if (!(newptr = (uchar *) my_realloc((void *) mult_rec_buff[i], alloced_rec_buff_length, MYF(MY_ALLOW_ZERO_PTR)))) {
                    assert(false);
                }
                mult_rec_buff[i] = newptr;
                mult_rec_dbt[i].ulen = alloced_rec_buff_length;
                mult_rec_dbt[i].flags = DB_DBT_USERMEM;
                mult_rec_dbt[i].data = mult_rec_buff[i];
            }
        }
    }
}

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void ha_tokudb::fix_mult_rec_buff() {
    if (alloced_rec_buff_length > alloced_mult_rec_buff_length) {
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        for (uint i = 0; i < share->num_DBs; i++) {
            if (share->rec_has_buff[i]) {
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                uchar *newptr;
                if (!(newptr = (uchar *) my_realloc((void *) mult_rec_buff[i], alloced_rec_buff_length, MYF(MY_ALLOW_ZERO_PTR)))) {
                    assert(false);
                }
                mult_rec_buff[i] = newptr;
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                mult_rec_dbt[i].ulen = alloced_rec_buff_length;
                mult_rec_dbt[i].flags = DB_DBT_USERMEM;
                mult_rec_dbt[i].data = mult_rec_buff[i];
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            }
        }
        alloced_mult_rec_buff_length = alloced_rec_buff_length;
    }
}


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/* Calculate max length needed for row */
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ulong ha_tokudb::max_row_length(const uchar * buf) {
    ulong length = table_share->reclength + table_share->fields * 2;
    uint *ptr, *end;
    for (ptr = table_share->blob_field, end = ptr + table_share->blob_fields; ptr != end; ptr++) {
        Field_blob *blob = ((Field_blob *) table->field[*ptr]);
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        length += blob->get_length((uchar *) (buf + field_offset(blob, table))) + 2;
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    }
    return length;
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}

/*
*/
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//
// take the row passed in as a DBT*, and convert it into a row in MySQL format in record
// Pack a row for storage.
// If the row is of fixed length, just store the  row 'as is'.
// If not, we will generate a packed row suitable for storage.
// This will only fail if we don't have enough memory to pack the row,
// which may only happen in rows with blobs, as the default row length is
// pre-allocated.
// Parameters:
//      [out]   row - row stored in DBT to be converted
2273
//      [out]   buf - buffer where row is packed
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//      [in]    record - row in MySQL format
//
2276

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int ha_tokudb::pack_row_in_buff(
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    DBT * row, 
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    const uchar* record,
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    uint index,
    uchar* row_buff
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    ) 
{
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    uchar* fixed_field_ptr = NULL;
    uchar* var_field_offset_ptr = NULL;
    uchar* start_field_data_ptr = NULL;
    uchar* var_field_data_ptr = NULL;
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    int r = ENOSYS;
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    bzero((void *) row, sizeof(*row));
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    my_bitmap_map *old_map = dbug_tmp_use_all_columns(table, table->write_set);
    
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    /* Copy null bits */
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    memcpy(row_buff, record, table_share->null_bytes);
    fixed_field_ptr = row_buff + table_share->null_bytes;
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    var_field_offset_ptr = fixed_field_ptr + share->kc_info.mcp_info[index].fixed_field_size;
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    start_field_data_ptr = var_field_offset_ptr + share->kc_info.mcp_info[index].len_of_offsets;
    var_field_data_ptr = var_field_offset_ptr + share->kc_info.mcp_info[index].len_of_offsets;
2300

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    //
    // assert that when the hidden primary key exists, primary_key_offsets is NULL
    //
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    for (uint i = 0; i < table_share->fields; i++) {
        Field* field = table->field[i];
        uint curr_field_offset = field_offset(field, table);
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        if (bitmap_is_set(&share->kc_info.key_filters[index],i)) {
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            continue;
        }
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        if (share->kc_info.field_lengths[i]) {
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            fixed_field_ptr = pack_fixed_field(
                fixed_field_ptr,
                record + curr_field_offset, 
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                share->kc_info.field_lengths[i]
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                );
        }
2317
        else if (share->kc_info.length_bytes[i]) {
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            var_field_data_ptr = pack_var_field(
                var_field_offset_ptr,
                var_field_data_ptr,
                start_field_data_ptr,
                record + curr_field_offset,
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                share->kc_info.length_bytes[i],
                share->kc_info.num_offset_bytes
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                );
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            var_field_offset_ptr += share->kc_info.num_offset_bytes;
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        }
    }

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    for (uint i = 0; i < share->kc_info.num_blobs; i++) {
        Field* field = table->field[share->kc_info.blob_fields[i]];
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        var_field_data_ptr = pack_toku_field_blob(
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            var_field_data_ptr,
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            record + field_offset(field, table),
            field
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            );
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    }
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    row->data = row_buff;
    row->size = (size_t) (var_field_data_ptr - row_buff);
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    r = 0;

    dbug_tmp_restore_column_map(table->write_set, old_map);
    return r;
2345 2346
}

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2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366
int ha_tokudb::pack_row(
    DBT * row, 
    const uchar* record,
    uint index
    )
{
    return pack_row_in_buff(row,record,index,rec_buff);
}

int ha_tokudb::pack_old_row_for_update(
    DBT * row, 
    const uchar* record,
    uint index
    )
{
    return pack_row_in_buff(row,record,index,rec_update_buff);
}


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int ha_tokudb::unpack_blobs(
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    uchar* record,
    const uchar* from_tokudb_blob,
2370 2371
    u_int32_t num_bytes,
    bool check_bitmap
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    )
{
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    uint error = 0;
    uchar* ptr = NULL;
    const uchar* buff = NULL;
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    //
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    // assert that num_bytes > 0 iff share->num_blobs > 0
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    //
2380
    assert( !((share->kc_info.num_blobs == 0) && (num_bytes > 0)) );
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    if (num_bytes > num_blob_bytes) {
        ptr = (uchar *)my_realloc((void *)blob_buff, num_bytes, MYF(MY_ALLOW_ZERO_PTR));
        if (ptr == NULL) {
            error = ENOMEM;
            goto exit;
        }
        blob_buff = ptr;
        num_blob_bytes = num_bytes;
    }
    
    memcpy(blob_buff, from_tokudb_blob, num_bytes);
    buff= blob_buff;
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    for (uint i = 0; i < share->kc_info.num_blobs; i++) {
2394 2395 2396 2397 2398 2399
        u_int32_t curr_field_index = share->kc_info.blob_fields[i]; 
        bool skip = check_bitmap ? 
            !(bitmap_is_set(table->read_set,curr_field_index) || 
                bitmap_is_set(table->write_set,curr_field_index)) : 
            false;
        Field* field = table->field[curr_field_index];
2400
        u_int32_t len_bytes = field->row_pack_length();
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        buff = unpack_toku_field_blob(
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            record + field_offset(field, table),
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            buff,
2404
            len_bytes,
2405
            skip
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            );
    }

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    error = 0;
exit:
    return error;
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}

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//
// take the row passed in as a DBT*, and convert it into a row in MySQL format in record
// Parameters:
//      [out]   record - row in MySQL format
//      [in]    row - row stored in DBT to be converted
//
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int ha_tokudb::unpack_row(
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    uchar* record, 
    DBT const *row, 
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    DBT const *key,
    uint index
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    ) 
{
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    //
    // two cases, fixed length row, and variable length row
    // fixed length row is first below
    //
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    /* Copy null bits */
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    int error = 0;
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    const uchar* fixed_field_ptr = (const uchar *) row->data;
    const uchar* var_field_offset_ptr = NULL;
    const uchar* var_field_data_ptr = NULL;
    u_int32_t data_end_offset = 0;
    memcpy(record, fixed_field_ptr, table_share->null_bytes);
    fixed_field_ptr += table_share->null_bytes;
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2440
    var_field_offset_ptr = fixed_field_ptr + share->kc_info.mcp_info[index].fixed_field_size;
2441
    var_field_data_ptr = var_field_offset_ptr + share->kc_info.mcp_info[index].len_of_offsets;
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2442

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    //
    // unpack the key, if necessary
    //
    if (!(hidden_primary_key && index == primary_key)) {
        unpack_key(record,key,index);
    }

    u_int32_t last_offset = 0;
    //
    // we have two methods of unpacking, one if we need to unpack the entire row
    // the second if we unpack a subset of the entire row
    // first method here is if we unpack the entire row
    //
    if (unpack_entire_row) {
        //
        // fill in parts of record that are not part of the key
        //
        for (uint i = 0; i < table_share->fields; i++) {
            Field* field = table->field[i];
2462
            if (bitmap_is_set(&share->kc_info.key_filters[index],i)) {
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                continue;
            }
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2466
            if (share->kc_info.field_lengths[i]) {
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                fixed_field_ptr = unpack_fixed_field(
                    record + field_offset(field, table),
                    fixed_field_ptr,
2470
                    share->kc_info.field_lengths[i]
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                    );
            }
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            //
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            // here, we DO modify var_field_data_ptr or var_field_offset_ptr
            // as we unpack variable sized fields
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            //
2477 2478
            else if (share->kc_info.length_bytes[i]) {
                switch (share->kc_info.num_offset_bytes) {
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                case (1):
                    data_end_offset = var_field_offset_ptr[0];
                    break;
                case (2):
                    data_end_offset = uint2korr(var_field_offset_ptr);
                    break;
                default:
                    assert(false);
                    break;
                }
                unpack_var_field(
                    record + field_offset(field, table),
                    var_field_data_ptr,
                    data_end_offset - last_offset,
2493
                    share->kc_info.length_bytes[i]
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                    );
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                var_field_offset_ptr += share->kc_info.num_offset_bytes;
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                var_field_data_ptr += data_end_offset - last_offset;
                last_offset = data_end_offset;
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            }
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        }
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        error = unpack_blobs(
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            record,
            var_field_data_ptr,
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            row->size - (u_int32_t)(var_field_data_ptr - (const uchar *)row->data),
            false
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            );
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        if (error) {
            goto exit;
        }
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    }
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    //
    // in this case, we unpack only what is specified 
    // in fixed_cols_for_query and var_cols_for_query
    //
2514
    else {
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        //
        // first the fixed fields
        //
        for (u_int32_t i = 0; i < num_fixed_cols_for_query; i++) {
            uint field_index = fixed_cols_for_query[i];
            Field* field = table->field[field_index];
            unpack_fixed_field(
                record + field_offset(field, table),
2523 2524
                fixed_field_ptr + share->kc_info.cp_info[index][field_index].col_pack_val,
                share->kc_info.field_lengths[field_index]
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                );
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        }

        //
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        // now the var fields
        // here, we do NOT modify var_field_data_ptr or var_field_offset_ptr
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        //
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        for (u_int32_t i = 0; i < num_var_cols_for_query; i++) {
            uint field_index = var_cols_for_query[i];
            Field* field = table->field[field_index];
2535
            u_int32_t var_field_index = share->kc_info.cp_info[index][field_index].col_pack_val;
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            u_int32_t data_start_offset;
2537
            u_int32_t field_len;
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            get_var_field_info(
                &field_len, 
                &data_start_offset, 
                var_field_index, 
                var_field_offset_ptr, 
                share->kc_info.num_offset_bytes
                );
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            unpack_var_field(
                record + field_offset(field, table),
                var_field_data_ptr + data_start_offset,
2550 2551
                field_len,
                share->kc_info.length_bytes[field_index]
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                );
        }

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        if (read_blobs) {
            //
            // now the blobs
            //
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            get_blob_field_info(
                &data_end_offset, 
                share->kc_info.mcp_info[index].len_of_offsets,
                var_field_data_ptr, 
                share->kc_info.num_offset_bytes
                );
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            var_field_data_ptr += data_end_offset;
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            error = unpack_blobs(
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                record,
                var_field_data_ptr,
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                row->size - (u_int32_t)(var_field_data_ptr - (const uchar *)row->data),
                true
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                );
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            if (error) {
                goto exit;
            }
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        }
2577
    }
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    error = 0;
exit:
    return error;
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}

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u_int32_t ha_tokudb::place_key_into_mysql_buff(
    KEY* key_info, 
    uchar * record, 
    uchar* data
    ) 
{
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    KEY_PART_INFO *key_part = key_info->key_part, *end = key_part + key_info->key_parts;
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    uchar *pos = data;
2591 2592

    for (; key_part != end; key_part++) {
2593 2594
        if (key_part->field->null_bit) {
            uint null_offset = get_null_offset(table, key_part->field);
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            if (*pos++ == NULL_COL_VAL) { // Null value
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                //
                // We don't need to reset the record data as we will not access it
                // if the null data is set
                //            
2600
                record[null_offset] |= key_part->field->null_bit;
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                continue;
            }
2603
            record[null_offset] &= ~key_part->field->null_bit;
2604
        }
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        //
        // HOPEFULLY TEMPORARY
        //
        assert(table->s->db_low_byte_first);
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        pos = unpack_toku_key_field(
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            record + field_offset(key_part->field, table),
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            pos,
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            key_part->field,
            key_part->length
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            );
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    }
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    return pos-data;
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}

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//
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// Store the key and the primary key into the row
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// Parameters:
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//      [out]   record - key stored in MySQL format
//      [in]    key - key stored in DBT to be converted
//              index -index into key_file that represents the DB 
//                  unpacking a key of
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//
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void ha_tokudb::unpack_key(uchar * record, DBT const *key, uint index) {
    u_int32_t bytes_read;
    uchar *pos = (uchar *) key->data + 1;
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    bytes_read = place_key_into_mysql_buff(
        &table->key_info[index], 
        record, 
        pos
        );
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    if( (index != primary_key) && !hidden_primary_key) {
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        //
        // also unpack primary key
        //
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        place_key_into_mysql_buff(
            &table->key_info[primary_key], 
            record, 
            pos+bytes_read
            );
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    }
}
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u_int32_t ha_tokudb::place_key_into_dbt_buff(
    KEY* key_info, 
    uchar * buff, 
    const uchar * record, 
    bool* has_null, 
    int key_length
    ) 
{
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    KEY_PART_INFO *key_part = key_info->key_part;
    KEY_PART_INFO *end = key_part + key_info->key_parts;
    uchar* curr_buff = buff;
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    *has_null = false;
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    for (; key_part != end && key_length > 0; key_part++) {
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        //
        // accessing key_part->field->null_bit instead off key_part->null_bit
        // because key_part->null_bit is not set in add_index
        // filed ticket 862 to look into this
        //
        if (key_part->field->null_bit) {
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            /* Store 0 if the key part is a NULL part */
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            uint null_offset = get_null_offset(table, key_part->field);
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            if (record[null_offset] & key_part->field->null_bit) {
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                *curr_buff++ = NULL_COL_VAL;
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                *has_null = true;
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                continue;
            }
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            *curr_buff++ = NONNULL_COL_VAL;        // Store NOT NULL marker
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        }
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        //
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        // HOPEFULLY TEMPORARY
        //
        assert(table->s->db_low_byte_first);
        //
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        // accessing field_offset(key_part->field) instead off key_part->offset
        // because key_part->offset is SET INCORRECTLY in add_index
        // filed ticket 862 to look into this
        //
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        curr_buff = pack_toku_key_field(
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            curr_buff,
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            (uchar *) (record + field_offset(key_part->field, table)),
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            key_part->field,
            key_part->length
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            );
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        key_length -= key_part->length;
    }
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    return curr_buff - buff;
}



//
// Create a packed key from a row. This key will be written as such
// to the index tree.  This will never fail as the key buffer is pre-allocated.
// Parameters:
//      [out]   key - DBT that holds the key
//      [in]    key_info - holds data about the key, such as it's length and offset into record
//      [out]   buff - buffer that will hold the data for key (unless 
//                  we have a hidden primary key)
//      [in]    record - row from which to create the key
//              key_length - currently set to MAX_KEY_LENGTH, is it size of buff?
// Returns:
//      the parameter key
//

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DBT* ha_tokudb::create_dbt_key_from_key(
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    DBT * key,
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    KEY* key_info, 
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    uchar * buff,
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    const uchar * record, 
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    bool* has_null,
    bool dont_pack_pk,
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    int key_length
    ) 
{
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    u_int32_t size = 0;
    uchar* tmp_buff = buff;
    my_bitmap_map *old_map = dbug_tmp_use_all_columns(table, table->write_set);

    key->data = buff;

    //
    // first put the "infinity" byte at beginning. States if missing columns are implicitly
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    // positive infinity or negative infinity or zero. For this, because we are creating key
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    // from a row, there is no way that columns can be missing, so in practice,
    // this will be meaningless. Might as well put in a value
    //
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    *tmp_buff++ = COL_ZERO;
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    size++;
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    size += place_key_into_dbt_buff(
        key_info, 
        tmp_buff, 
        record, 
        has_null, 
        key_length
        );
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    if (!dont_pack_pk) {
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        tmp_buff = buff + size;
        if (hidden_primary_key) {
            memcpy_fixed(tmp_buff, current_ident, TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH);
            size += TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH;
        }
        else {
            bool tmp_bool = false;
            size += place_key_into_dbt_buff(
                &table->key_info[primary_key], 
                tmp_buff, 
                record, 
                &tmp_bool, 
                MAX_KEY_LENGTH //this parameter does not matter
                );
        }
    }

    key->size = size;
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    DBUG_DUMP("key", (uchar *) key->data, key->size);
    dbug_tmp_restore_column_map(table->write_set, old_map);
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    return key;
}


//
// Create a packed key from a row. This key will be written as such
// to the index tree.  This will never fail as the key buffer is pre-allocated.
// Parameters:
//      [out]   key - DBT that holds the key
//              keynr - index for which to create the key
//      [out]   buff - buffer that will hold the data for key (unless 
//                  we have a hidden primary key)
//      [in]    record - row from which to create the key
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//      [out]   has_null - says if the key has a NULL value for one of its columns
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//              key_length - currently set to MAX_KEY_LENGTH, is it size of buff?
// Returns:
//      the parameter key
//
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DBT *ha_tokudb::create_dbt_key_from_table(
    DBT * key, 
    uint keynr, 
    uchar * buff, 
    const uchar * record, 
    bool* has_null, 
    int key_length
    ) 
{
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    TOKUDB_DBUG_ENTER("ha_tokudb::create_dbt_key_from_table");
    bzero((void *) key, sizeof(*key));
    if (hidden_primary_key && keynr == primary_key) {
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        key->data = buff;
        memcpy(buff, &current_ident, TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH);
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        key->size = TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH;
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        *has_null = false;
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        DBUG_RETURN(key);
    }
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    DBUG_RETURN(create_dbt_key_from_key(key, &table->key_info[keynr],buff,record, has_null, (keynr == primary_key), key_length));
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}

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DBT* ha_tokudb::create_dbt_key_for_lookup(
    DBT * key, 
    KEY* key_info, 
    uchar * buff, 
    const uchar * record, 
    bool* has_null, 
    int key_length
    )
{
    TOKUDB_DBUG_ENTER("ha_tokudb::create_dbt_key_from_lookup");
    DBUG_RETURN(create_dbt_key_from_key(key, key_info, buff, record, has_null, true, key_length));    
}
2814

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//
// Create a packed key from from a MySQL unpacked key (like the one that is
// sent from the index_read() This key is to be used to read a row
// Parameters:
//      [out]   key - DBT that holds the key
//              keynr - index for which to pack the key
//      [out]   buff - buffer that will hold the data for key
//      [in]    key_ptr - MySQL unpacked key
//              key_length - length of key_ptr
// Returns:
//      the parameter key
//
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DBT *ha_tokudb::pack_key(
    DBT * key, 
    uint keynr, 
    uchar * buff, 
    const uchar * key_ptr, 
    uint key_length, 
2833
    int8_t inf_byte
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    ) 
{
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    TOKUDB_DBUG_ENTER("ha_tokudb::pack_key");
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    KEY *key_info = &table->key_info[keynr];
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    KEY_PART_INFO *key_part = key_info->key_part;
    KEY_PART_INFO *end = key_part + key_info->key_parts;
    my_bitmap_map *old_map = dbug_tmp_use_all_columns(table, table->write_set);

    bzero((void *) key, sizeof(*key));
    key->data = buff;

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    //
    // first put the "infinity" byte at beginning. States if missing columns are implicitly
    // positive infinity or negative infinity
    //
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    *buff++ = (uchar)inf_byte;
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    for (; key_part != end && (int) key_length > 0; key_part++) {
        uint offset = 0;
        if (key_part->null_bit) {
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            if (!(*key_ptr == 0)) {
                *buff++ = NULL_COL_VAL;
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                key_length -= key_part->store_length;
                key_ptr += key_part->store_length;
                continue;
            }
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            *buff++ = NONNULL_COL_VAL;
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            offset = 1;         // Data is at key_ptr+1
        }
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        assert(table->s->db_low_byte_first);

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        buff = pack_key_toku_key_field(
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            buff,
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            (uchar *) key_ptr + offset,
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            key_part->field,
            key_part->length
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            );
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        key_ptr += key_part->store_length;
        key_length -= key_part->store_length;
    }
    key->size = (buff - (uchar *) key->data);
    DBUG_DUMP("key", (uchar *) key->data, key->size);
    dbug_tmp_restore_column_map(table->write_set, old_map);
    DBUG_RETURN(key);
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}

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//
// Reads the last element of dictionary of index keynr, and places
// the data into table->record[1].
//
2885
int ha_tokudb::read_last(uint keynr) {
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    TOKUDB_DBUG_ENTER("ha_tokudb::read_last");
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    int do_commit = 0;
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    if (transaction == NULL) {
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        int r = db_env->txn_begin(db_env, 0, &transaction, 0);
        assert(r == 0);
        do_commit = 1;
    }
2893
    int error = index_init(keynr, 0);
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    if (error == 0)
        error = index_last(table->record[1]);
    index_end();
    if (do_commit) {
2898
        commit_txn(transaction, 0);
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        transaction = NULL;
2900
    }
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    TOKUDB_DBUG_RETURN(error);
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}

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//
// get max used hidden primary key value
//
void ha_tokudb::init_hidden_prim_key_info() {
    TOKUDB_DBUG_ENTER("ha_tokudb::init_prim_key_info");
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    pthread_mutex_lock(&share->mutex);
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    if (!(share->status & STATUS_PRIMARY_KEY_INIT)) {
        (void) extra(HA_EXTRA_KEYREAD);
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        int error = read_last(primary_key);
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        (void) extra(HA_EXTRA_NO_KEYREAD);
        if (error == 0) {
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            share->auto_ident = hpk_char_to_num(current_ident);
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        }
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        share->status |= STATUS_PRIMARY_KEY_INIT;
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    }
    pthread_mutex_unlock(&share->mutex);
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    DBUG_VOID_RETURN;
}
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/** @brief
    Get metadata info stored in status.tokudb
    */
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int ha_tokudb::get_status() {
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    TOKUDB_DBUG_ENTER("ha_tokudb::get_status");
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    DB_TXN* txn = NULL;
    DBT key, value;
    HA_METADATA_KEY curr_key;
    int error;
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    //
    // open status.tokudb
    //
    if (!share->status_block) {
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        error = open_status_dictionary(
            &share->status_block, 
            share->table_name, 
            NULL
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            );
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        if (error) { 
            goto cleanup; 
        }
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    }
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    //
    // transaction to be used for putting metadata into status.tokudb
    //
    bzero(&key, sizeof(key));
    bzero(&value, sizeof(value));
    key.data = &curr_key;
    key.size = sizeof(curr_key);
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    value.flags = DB_DBT_USERMEM;
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    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) { goto cleanup; }
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    assert(share->status_block);
    //
    // get version
    //
    value.ulen = sizeof(share->version);
    value.data = &share->version;
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    curr_key = hatoku_new_version;
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    error = share->status_block->get(
        share->status_block, 
        txn, 
        &key, 
        &value, 
        0
        );
    if (error == DB_NOTFOUND) {
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        //
        // hack to keep handle the issues of going back and forth
        // between 5.0.3 to 5.0.4
        // the problem with going back and forth
        // is with storing the frm file, 5.0.4 stores it, 5.0.3 does not
        // so, if a user goes back and forth and alters the schema
        // the frm stored can get out of sync with the schema of the table
        // This can cause issues.
        // To take care of this, we are doing this versioning work here.
        // We change the key that stores the version. 
        // In 5.0.3, it is hatoku_old_version, in 5.0.4 it is hatoku_new_version
        // When we encounter a table that does not have hatoku_new_version
        // set, we give it the right one, and overwrite the old one with zero.
        // This ensures that 5.0.3 cannot open the table. Once it has been opened by 5.0.4
        //
        uint dummy_version = 0;
        share->version = HA_TOKU_ORIG_VERSION;
        error = write_to_status(
            share->status_block, 
            hatoku_new_version,
            &share->version,
            sizeof(share->version), 
            txn
            );
        if (error) { goto cleanup; }
        error = write_to_status(
            share->status_block, 
            hatoku_old_version,
            &dummy_version,
            sizeof(dummy_version), 
            txn
            );
        if (error) { goto cleanup; }
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    }
    else if (error || value.size != sizeof(share->version)) {
        if (error == 0) {
            error = HA_ERR_INTERNAL_ERROR;
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        }
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        goto cleanup;
    }
    //
    // get capabilities
    //
    curr_key = hatoku_capabilities;
    value.ulen = sizeof(share->capabilities);
    value.data = &share->capabilities;
    error = share->status_block->get(
        share->status_block, 
        txn, 
        &key, 
        &value, 
        0
        );
    if (error == DB_NOTFOUND) {
        share->capabilities= 0;
    }
    else if (error || value.size != sizeof(share->version)) {
        if (error == 0) {
            error = HA_ERR_INTERNAL_ERROR;
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        }
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        goto cleanup;
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    }
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    error = 0;
cleanup:
    if (txn) {
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        commit_txn(txn,0);
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    }
    TOKUDB_DBUG_RETURN(error);
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}

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/** @brief
    Return an estimated of the number of rows in the table.
    Used when sorting to allocate buffers and by the optimizer.
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    This is used in filesort.cc. 
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*/
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ha_rows ha_tokudb::estimate_rows_upper_bound() {
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    TOKUDB_DBUG_ENTER("ha_tokudb::estimate_rows_upper_bound");
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3053
    DBUG_RETURN(share->rows + HA_TOKUDB_EXTRA_ROWS);
3054
}
3055

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//
// Function that compares two primary keys that were saved as part of rnd_pos
// and ::position
//
3060
int ha_tokudb::cmp_ref(const uchar * ref1, const uchar * ref2) {
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    int ret_val = 0;
    ret_val = tokudb_compare_two_keys(
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        ref1 + sizeof(u_int32_t),
        *(u_int32_t *)ref1,
        ref2 + sizeof(u_int32_t),
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3066
        *(u_int32_t *)ref2,
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        (uchar *)share->file->descriptor->dbt.data + 4,
        *(u_int32_t *)share->file->descriptor->dbt.data - 4,
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3069
        false
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        );
    return ret_val;
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}

3074
bool ha_tokudb::check_if_incompatible_data(HA_CREATE_INFO * info, uint table_changes) {
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  //
  // This is a horrendous hack for now, as copied by InnoDB.
  // This states that if the auto increment create field has changed,
  // via a "alter table foo auto_increment=new_val", that this
  // change is incompatible, and to rebuild the entire table
  // This will need to be fixed
  //
  if ((info->used_fields & HA_CREATE_USED_AUTO) &&
      info->auto_increment_value != 0) {

    return COMPATIBLE_DATA_NO;
  }
  if (table_changes != IS_EQUAL_YES)
3088
    return COMPATIBLE_DATA_NO;
3089
  return COMPATIBLE_DATA_YES;
3090
}
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3091

3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103
//
// Method that is called before the beginning of many calls
// to insert rows (ha_tokudb::write_row). There is no guarantee
// that start_bulk_insert is called, however there is a guarantee
// that if start_bulk_insert is called, then end_bulk_insert may be
// called as well.
// Parameters:
//      [in]    rows - an estimate of the number of rows that will be inserted
//                     if number of rows is unknown (such as if doing 
//                     "insert into foo select * from bar), then rows 
//                     will be 0
//
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//
// This function returns true if the table MAY be empty.
// It is NOT meant to be a 100% check for emptiness.
// This is used for a bulk load optimization.
//
bool ha_tokudb::may_table_be_empty() {
    int error;
    bool ret_val = false;
    DBC* tmp_cursor = NULL;
    DB_TXN* txn = NULL;

    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) {
        goto cleanup;
    }

    error = share->file->cursor(share->file, txn, &tmp_cursor, 0);
    if (error) {
        goto cleanup;
    }
    error = tmp_cursor->c_getf_next(tmp_cursor, 0, smart_dbt_do_nothing, NULL);
    if (error == DB_NOTFOUND) {
        ret_val = true;
    }
    else {
        ret_val = false;
    }
    error = 0;
cleanup:
    if (tmp_cursor) {
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        int r = tmp_cursor->c_close(tmp_cursor);
        assert(r==0);
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        tmp_cursor = NULL;
    }
    if (txn) {
3139
        commit_txn(txn, 0);
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        txn = NULL;
    }
    return ret_val;
}

3145
void ha_tokudb::start_bulk_insert(ha_rows rows) {
3146 3147
    TOKUDB_DBUG_ENTER("ha_tokudb::start_bulk_insert");
    THD* thd = ha_thd();
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    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
3149
    delay_updating_ai_metadata = true;
3150
    ai_metadata_update_required = false;
3151
    abort_loader = false;
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    rw_rdlock(&share->num_DBs_lock);
    uint curr_num_DBs = table->s->keys + test(hidden_primary_key);
    num_DBs_locked_in_bulk = true;
    lock_count = 0;
    
3158
    if (share->try_table_lock) {
3159
        if (get_prelock_empty(thd) && may_table_be_empty()) {
3160
            if (using_ignore || get_load_save_space(thd)) {
3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178
                acquire_table_lock(transaction, lock_write);
            }
            else {
                mult_dbt_flags[primary_key] = 0;
                if (!thd_test_options(thd, OPTION_RELAXED_UNIQUE_CHECKS) && !hidden_primary_key) {
                    mult_put_flags[primary_key] = DB_NOOVERWRITE;
                }
                int error = db_env->create_loader(
                    db_env, 
                    transaction, 
                    &loader, 
                    NULL, // no src_db needed
                    curr_num_DBs, 
                    share->key_file, 
                    mult_put_flags,
                    mult_dbt_flags,
                    0
                    );
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                if (error) { 
                    assert(loader == NULL);
                    goto exit_try_table_lock;
                }
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                lc.thd = thd;
                lc.ha = this;
                
                error = loader->set_poll_function(loader, poll_fun, &lc);
                assert(!error);

                error = loader->set_error_callback(loader, loader_dup_fun, &lc);
                assert(!error);
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                trx->stmt_progress.using_loader = true;
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            }
3195
        }
3196
    exit_try_table_lock:
3197
        pthread_mutex_lock(&share->mutex);
3198
        share->try_table_lock = false; // RFP what good is the mutex?
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        pthread_mutex_unlock(&share->mutex);
    }
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    for (uint i = 0; i < curr_num_DBs; i++) {
        DB* curr_DB = share->key_file[i];
        int error = curr_DB->pre_acquire_fileops_shared_lock(curr_DB, transaction);
        if (!error) {
            mult_put_flags[i] |= DB_PRELOCKED_FILE_READ;
        }
    }
3208
    DBUG_VOID_RETURN;
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}

//
// Method that is called at the end of many calls to insert rows
// (ha_tokudb::write_row). If start_bulk_insert is called, then
// this is guaranteed to be called.
//
3216
int ha_tokudb::end_bulk_insert(bool abort) {
3217
    TOKUDB_DBUG_ENTER("ha_tokudb::end_bulk_insert");
3218
    int error = 0;
3219
    THD* thd = ha_thd();
3220
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
3221
    bool using_loader = (loader != NULL);
3222
    uint curr_num_DBs = table->s->keys + test(hidden_primary_key);
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    if (ai_metadata_update_required) {
        pthread_mutex_lock(&share->mutex);
        error = update_max_auto_inc(share->status_block, share->last_auto_increment);
        pthread_mutex_unlock(&share->mutex);
3227
        if (error) { goto cleanup; }
3228 3229 3230
    }
    delay_updating_ai_metadata = false;
    ai_metadata_update_required = false;
3231 3232
    loader_error = 0;
    if (loader) {
3233
        if (!abort_loader && !thd->killed) {
3234 3235
            error = loader->close(loader);
            loader = NULL;
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            if (error) { 
                if (thd->killed) {
                    my_error(ER_QUERY_INTERRUPTED, MYF(0));
                }
                goto cleanup; 
            }
3242 3243 3244 3245

            for (uint i = 0; i < table_share->keys; i++) {
                if (table_share->key_info[i].flags & HA_NOSAME) {
                    bool is_unique;
3246 3247 3248
                    if (i == primary_key) {
                        continue;
                    }
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                    error = is_index_unique(
                        &is_unique, 
                        transaction, 
                        share->key_file[i], 
                        &table->key_info[i]
                        );
                    if (error) goto cleanup;
                    if (!is_unique) {
                        error = HA_ERR_FOUND_DUPP_KEY;
                        last_dup_key = i;
                        goto cleanup;
                    }
                }
            }
        }
        else {
3265 3266
            error = sprintf(write_status_msg, "aborting bulk load"); 
            thd_proc_info(thd, write_status_msg);
3267 3268
            loader->abort(loader);
            loader = NULL;
3269
            share->try_table_lock = true;
3270 3271 3272 3273
        }
    }

cleanup:
3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284
    if (num_DBs_locked_in_bulk) {
        rw_unlock(&share->num_DBs_lock);
    }
    num_DBs_locked_in_bulk = false;
    lock_count = 0;

    for (uint i = 0; i < curr_num_DBs; i++) {
        u_int32_t prelocked_read_flag = DB_PRELOCKED_FILE_READ;
        mult_put_flags[i] &= ~(prelocked_read_flag);
    }

3285
    if (loader) {
3286 3287
        error = sprintf(write_status_msg, "aborting bulk load"); 
        thd_proc_info(thd, write_status_msg);
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        loader->abort(loader);
        loader = NULL;
    }
    abort_loader = false;
    bzero(&lc,sizeof(lc));
    if (error || loader_error) {
        my_errno = error ? error : loader_error;
3295 3296 3297
        if (using_loader) {
            share->try_table_lock = true;
        }
3298
    }
3299
    trx->stmt_progress.using_loader = false;
3300
    TOKUDB_DBUG_RETURN(error ? error : loader_error);
3301 3302
}

3303 3304 3305
int ha_tokudb::end_bulk_insert() {
    return end_bulk_insert( false );
}
3306

3307 3308 3309 3310 3311
int ha_tokudb::is_index_unique(bool* is_unique, DB_TXN* txn, DB* db, KEY* key_info) {
    int error;
    DBC* tmp_cursor1 = NULL;
    DBC* tmp_cursor2 = NULL;
    DBT key1, key2, val, packed_key1, packed_key2;
3312
    u_int64_t cnt = 0;
3313
    char status_msg[MAX_ALIAS_NAME + 200]; //buffer of 200 should be a good upper bound.
3314
    THD* thd = ha_thd();
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    bzero(&key1, sizeof(key1));
    bzero(&key2, sizeof(key2));
    bzero(&val, sizeof(val));
    bzero(&packed_key1, sizeof(packed_key1));
    bzero(&packed_key2, sizeof(packed_key2));
    *is_unique = true;
    
    error = db->cursor(
        db, 
        txn, 
        &tmp_cursor1, 
3326
        DB_SERIALIZABLE
3327 3328 3329 3330 3331 3332 3333
        );
    if (error) { goto cleanup; }

    error = db->cursor(
        db, 
        txn, 
        &tmp_cursor2,
3334
        DB_SERIALIZABLE
3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404
        );
    if (error) { goto cleanup; }

    
    error = tmp_cursor1->c_get(
        tmp_cursor1, 
        &key1, 
        &val, 
        DB_NEXT
        );
    if (error == DB_NOTFOUND) {
        *is_unique = true;
        error = 0;
        goto cleanup;
    }
    else if (error) { goto cleanup; }
    error = tmp_cursor2->c_get(
        tmp_cursor2, 
        &key2, 
        &val, 
        DB_NEXT
        );
    if (error) { goto cleanup; }

    error = tmp_cursor2->c_get(
        tmp_cursor2, 
        &key2, 
        &val, 
        DB_NEXT
        );
    if (error == DB_NOTFOUND) {
        *is_unique = true;
        error = 0;
        goto cleanup;
    }
    else if (error) { goto cleanup; }

    while (error != DB_NOTFOUND) {
        bool has_null1;
        bool has_null2;
        int cmp;
        place_key_into_mysql_buff(
            key_info,
            table->record[0], 
            (uchar *) key1.data + 1
            );
        place_key_into_mysql_buff(
            key_info,
            table->record[1], 
            (uchar *) key2.data + 1
            );
        
        create_dbt_key_for_lookup(
            &packed_key1,
            key_info,
            key_buff,
            table->record[0],
            &has_null1
            );
        create_dbt_key_for_lookup(
            &packed_key2,
            key_info,
            key_buff2,
            table->record[1],
            &has_null2
            );

        if (!has_null1 && !has_null2) {
            cmp = tokudb_prefix_cmp_dbt_key(db, &packed_key1, &packed_key2);
            if (cmp == 0) {
3405 3406 3407 3408 3409 3410
                memcpy(key_buff, key1.data, key1.size);
                place_key_into_mysql_buff(
                    key_info,
                    table->record[0], 
                    (uchar *) key_buff + 1
                    );
3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429
                *is_unique = false;
                break;
            }
        }

        error = tmp_cursor1->c_get(
            tmp_cursor1, 
            &key1, 
            &val, 
            DB_NEXT
            );
        if (error) { goto cleanup; }
        error = tmp_cursor2->c_get(
            tmp_cursor2, 
            &key2, 
            &val, 
            DB_NEXT
            );
        if (error && (error != DB_NOTFOUND)) { goto cleanup; }
3430 3431

        cnt++;
3432 3433 3434 3435
        if ((cnt % 10000) == 0) {
            sprintf(
                status_msg, 
                "Verifying index uniqueness: Checked %llu of %llu rows in key-%s.", 
3436
                (long long unsigned) cnt, 
3437 3438 3439
                share->rows, 
                key_info->name);
            thd_proc_info(thd, status_msg);
3440 3441 3442 3443 3444 3445
            if (thd->killed) {
                my_error(ER_QUERY_INTERRUPTED, MYF(0));
                error = ER_QUERY_INTERRUPTED;
                goto cleanup;
            }
        }
3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461
    }

    error = 0;

cleanup:
    if (tmp_cursor1) {
        tmp_cursor1->c_close(tmp_cursor1);
        tmp_cursor1 = NULL;
    }
    if (tmp_cursor2) {
        tmp_cursor2->c_close(tmp_cursor2);
        tmp_cursor2 = NULL;
    }
    return error;
}

3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494
int ha_tokudb::is_val_unique(bool* is_unique, uchar* record, KEY* key_info, uint dict_index, DB_TXN* txn) {
    DBT key;
    int error = 0;
    bool has_null;
    DBC* tmp_cursor = NULL;
    struct index_read_info ir_info;
    struct smart_dbt_info info;
    bzero((void *)&key, sizeof(key));
    info.ha = this;
    info.buf = NULL;
    info.keynr = dict_index;

    ir_info.smart_dbt_info = info;
    
    create_dbt_key_for_lookup(
        &key,
        key_info,
        key_buff3,
        record,
        &has_null
        );
    ir_info.orig_key = &key;

    if (has_null) {
        error = 0;
        *is_unique = true;
        goto cleanup;
    }
    
    error = share->key_file[dict_index]->cursor(
        share->key_file[dict_index], 
        txn, 
        &tmp_cursor, 
3495
        DB_SERIALIZABLE
3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539
        );
    if (error) { goto cleanup; }

    error = tmp_cursor->c_getf_set_range(
        tmp_cursor, 
        0, 
        &key, 
        smart_dbt_callback_lookup, 
        &ir_info
        );
    if (error == DB_NOTFOUND) {
        *is_unique = true;
        error = 0;
        goto cleanup;
    }
    else if (error) {
        goto cleanup;
    }
    if (ir_info.cmp) {
        *is_unique = true;
    }
    else {
        *is_unique = false;
    }
    error = 0;

cleanup:
    if (tmp_cursor) {
        int r = tmp_cursor->c_close(tmp_cursor);
        assert(r==0);
        tmp_cursor = NULL;
    }
    return error;
}

int ha_tokudb::do_uniqueness_checks(uchar* record, DB_TXN* txn, THD* thd) {
    int error;
    //
    // first do uniqueness checks
    //
    if (share->has_unique_keys && !thd_test_options(thd, OPTION_RELAXED_UNIQUE_CHECKS)) {
        for (uint keynr = 0; keynr < table_share->keys; keynr++) {
            bool is_unique_key = table->key_info[keynr].flags & HA_NOSAME;
            bool is_unique = false;
3540 3541 3542 3543 3544 3545
            //
            // don't need to do check for primary key
            //
            if (keynr == primary_key) {
                continue;
            }
3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567
            if (!is_unique_key) {
                continue;
            }
            //
            // if unique key, check uniqueness constraint
            // but, we do not need to check it if the key has a null
            // and we do not need to check it if unique_checks is off
            //
            error = is_val_unique(&is_unique, record, &table->key_info[keynr], keynr, txn);
            if (error) { goto cleanup; }
            if (!is_unique) {
                error = DB_KEYEXIST;
                last_dup_key = keynr;
                goto cleanup;
            }
        }
    }    
    error = 0;
cleanup:
    return error;
}

3568
void ha_tokudb::test_row_packing(uchar* record, DBT* pk_key, DBT* pk_val) {
3569 3570 3571 3572 3573 3574 3575 3576 3577 3578
    int error;
    DBT row, key;
    //
    // variables for testing key packing, only used in some debug modes
    //
    uchar* tmp_pk_key_data = NULL;
    uchar* tmp_pk_val_data = NULL;
    DBT tmp_pk_key;
    DBT tmp_pk_val;
    bool has_null;
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    int cmp;
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    bzero(&tmp_pk_key, sizeof(DBT));
    bzero(&tmp_pk_val, sizeof(DBT));

    //
    //use for testing the packing of keys
    //
    tmp_pk_key_data = (uchar *)my_malloc(pk_key->size, MYF(MY_WME));
    assert(tmp_pk_key_data);
    tmp_pk_val_data = (uchar *)my_malloc(pk_val->size, MYF(MY_WME));
    assert(tmp_pk_val_data);
    memcpy(tmp_pk_key_data, pk_key->data, pk_key->size);
    memcpy(tmp_pk_val_data, pk_val->data, pk_val->size);
    tmp_pk_key.data = tmp_pk_key_data;
    tmp_pk_key.size = pk_key->size;
    tmp_pk_val.data = tmp_pk_val_data;
    tmp_pk_val.size = pk_val->size;

    for (uint keynr = 0; keynr < table_share->keys; keynr++) {
        u_int32_t tmp_num_bytes = 0;
        uchar* row_desc = NULL;
        u_int32_t desc_size = 0;
        
        if (keynr == primary_key) {
            continue;
        }

        create_dbt_key_from_table(&key, keynr, mult_key_buff[keynr], record, &has_null); 

        //
        // TEST
        //
3612
        row_desc = (uchar *)share->key_file[keynr]->descriptor->dbt.data;
3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630
        row_desc += (*(u_int32_t *)row_desc);
        desc_size = (*(u_int32_t *)row_desc) - 4;
        row_desc += 4;
        tmp_num_bytes = pack_key_from_desc(
            key_buff3,
            row_desc,
            desc_size,
            &tmp_pk_key,
            &tmp_pk_val
            );
        assert(tmp_num_bytes == key.size);
        cmp = memcmp(key_buff3,mult_key_buff[keynr],tmp_num_bytes);
        assert(cmp == 0);

        //
        // test key packing of clustering keys
        //
        if (table->key_info[keynr].flags & HA_CLUSTERING) {
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            error = pack_row(&row, (const uchar *) record, keynr);
3632
            assert(error == 0);
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            uchar* tmp_buff = NULL;
            tmp_buff = (uchar *)my_malloc(alloced_rec_buff_length,MYF(MY_WME));
            assert(tmp_buff);
3636
            row_desc = (uchar *)share->key_file[keynr]->descriptor->dbt.data;
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            row_desc += (*(u_int32_t *)row_desc);
            row_desc += (*(u_int32_t *)row_desc);
            desc_size = (*(u_int32_t *)row_desc) - 4;
            row_desc += 4;
            tmp_num_bytes = pack_clustering_val_from_desc(
                tmp_buff,
                row_desc,
                desc_size,
                &tmp_pk_val
                );
            assert(tmp_num_bytes == row.size);
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3648
            cmp = memcmp(tmp_buff,rec_buff,tmp_num_bytes);
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            assert(cmp == 0);
            my_free(tmp_buff,MYF(MY_ALLOW_ZERO_PTR));
        }
    }

3654 3655 3656 3657
    //
    // copy stuff back out
    //
    error = pack_row(pk_val, (const uchar *) record, primary_key);
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    assert(pk_val->size == tmp_pk_val.size);
    cmp = memcmp(pk_val->data, tmp_pk_val_data, pk_val->size);    
    assert( cmp == 0);
3661

3662 3663 3664 3665
    my_free(tmp_pk_key_data,MYF(MY_ALLOW_ZERO_PTR));
    my_free(tmp_pk_val_data,MYF(MY_ALLOW_ZERO_PTR));
}

3666 3667 3668
//
// set the put flags for the main dictionary
//
3669 3670 3671 3672 3673 3674 3675
void ha_tokudb::set_main_dict_put_flags(
    THD* thd, 
    u_int32_t* put_flags, 
    bool no_overwrite_no_error_allowed
    ) 
{
    u_int32_t old_prelock_flags = (*put_flags)&(DB_PRELOCKED_FILE_READ);
3676 3677
    uint curr_num_DBs = table->s->keys + test(hidden_primary_key);
    bool in_hot_index = share->num_DBs > curr_num_DBs;
3678
    //
3679
    // optimization for "REPLACE INTO..." (and "INSERT IGNORE") command
3680
    // if the command is "REPLACE INTO" and the only table
3681 3682
    // is the main table (or all indexes are a subset of the pk), 
    // then we can simply insert the element
3683 3684 3685
    // with DB_YESOVERWRITE. If the element does not exist,
    // it will act as a normal insert, and if it does exist, it 
    // will act as a replace, which is exactly what REPLACE INTO is supposed
3686
    // to do. We cannot do this if otherwise, because then we lose
3687 3688
    // consistency between indexes
    //
3689
    if (hidden_primary_key){
3690
        *put_flags = old_prelock_flags;
3691 3692
    }
    else if (thd_test_options(thd, OPTION_RELAXED_UNIQUE_CHECKS) && 
3693
        !is_replace_into(thd) && 
3694 3695
        !is_insert_ignore(thd)
        ) 
3696
    {
3697
        *put_flags = old_prelock_flags;
3698
    }
3699
    else if (do_ignore_flag_optimization(thd,table,share->replace_into_fast) && 
3700
        is_replace_into(thd)  && !in_hot_index
3701
        ) 
3702
    {
3703
        *put_flags = old_prelock_flags;
3704
    }
3705
    else if (do_ignore_flag_optimization(thd,table,share->replace_into_fast) && 
3706
        is_insert_ignore(thd) && no_overwrite_no_error_allowed && !in_hot_index
3707
        ) 
3708
    {
3709
        *put_flags = DB_NOOVERWRITE_NO_ERROR|old_prelock_flags;
3710 3711 3712
    }
    else 
    {
3713
        *put_flags = DB_NOOVERWRITE|old_prelock_flags;
3714
    }
3715 3716 3717 3718
}

int ha_tokudb::insert_row_to_main_dictionary(uchar* record, DBT* pk_key, DBT* pk_val, DB_TXN* txn) {
    int error = 0;
3719
    u_int32_t put_flags = mult_put_flags[primary_key];
3720 3721 3722 3723 3724 3725
    THD *thd = ha_thd();
    uint curr_num_DBs = table->s->keys + test(hidden_primary_key);
    ulonglong wait_lock_time = get_write_lock_wait_time(thd);

    assert(curr_num_DBs == 1);
    
3726
    set_main_dict_put_flags(thd, &put_flags, true);
3727

3728
    lockretryN(wait_lock_time){
3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744
        error = share->file->put(
            share->file, 
            txn, 
            pk_key,
            pk_val, 
            put_flags
            );
        lockretry_wait;
    }

    if (error) {
        last_dup_key = primary_key;
        goto cleanup;
    }

cleanup:
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3745 3746 3747
    return error;
}

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3748
int ha_tokudb::insert_rows_to_dictionaries_mult(DBT* pk_key, DBT* pk_val, DB_TXN* txn, THD* thd) {
3749
    int error = 0;
3750
    uint curr_num_DBs = share->num_DBs;
3751
    ulonglong wait_lock_time = get_write_lock_wait_time(thd);
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Zardosht Kasheff committed
3752

3753
    set_main_dict_put_flags(thd, &mult_put_flags[primary_key], false);
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3754
    
3755 3756 3757
    lockretryN(wait_lock_time){
        error = db_env->put_multiple(
            db_env, 
3758
            share->key_file[primary_key], 
3759 3760 3761 3762 3763 3764 3765
            txn, 
            pk_key, 
            pk_val,
            curr_num_DBs, 
            share->key_file, 
            mult_key_dbt,
            mult_rec_dbt,
3766
            mult_put_flags
3767 3768 3769
            );
        lockretry_wait;
    }
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3770

3771 3772 3773 3774 3775 3776
    //
    // We break if we hit an error, unless it is a dup key error
    // and MySQL told us to ignore duplicate key errors
    //
    if (error) {
        last_dup_key = primary_key;
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3777 3778 3779
    }
    return error;
}
3780

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3781 3782 3783 3784 3785 3786 3787 3788
//
// Stores a row in the table, called when handling an INSERT query
// Parameters:
//      [in]    record - a row in MySQL format
// Returns:
//      0 on success
//      error otherwise
//
3789
int ha_tokudb::write_row(uchar * record) {
3790
    TOKUDB_DBUG_ENTER("ha_tokudb::write_row");
3791
    DBT row, prim_key;
3792
    int error;
3793
    THD *thd = ha_thd();
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3794
    bool has_null;
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3795 3796
    DB_TXN* sub_trans = NULL;
    DB_TXN* txn = NULL;
3797
    tokudb_trx_data *trx = NULL;
3798
    uint curr_num_DBs;
3799
    bool create_sub_trans = false;
3800

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3801 3802 3803 3804
    //
    // some crap that needs to be done because MySQL does not properly abstract
    // this work away from us, namely filling in auto increment and setting auto timestamp
    //
3805
    statistic_increment(table->in_use->status_var.ha_write_count, &LOCK_status);
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3806
    if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT) {
3807
        table->timestamp_field->set_time();
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3808 3809
    }
    if (table->next_number_field && record == table->record[0]) {
3810
        update_auto_increment();
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3811
    }
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3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822

    //
    // check to see if some value for the auto increment column that is bigger
    // than anything else til now is being used. If so, update the metadata to reflect it
    // the goal here is we never want to have a dup key error due to a bad increment
    // of the auto inc field.
    //
    if (share->has_auto_inc && record == table->record[0]) {
        pthread_mutex_lock(&share->mutex);
        ulonglong curr_auto_inc = retrieve_auto_increment(
            table->field[share->ai_field_index]->key_type(), 
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3823
            field_offset(table->field[share->ai_field_index], table),
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3824 3825 3826
            record
            );
        if (curr_auto_inc > share->last_auto_increment) {
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3827
            share->last_auto_increment = curr_auto_inc;
3828 3829
            if (delay_updating_ai_metadata) {
                ai_metadata_update_required = true;
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3830
            }
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3831 3832 3833 3834
            else {
                update_max_auto_inc(share->status_block, share->last_auto_increment);
            }
         }
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3835 3836 3837
        pthread_mutex_unlock(&share->mutex);
    }

3838 3839 3840
    //
    // grab reader lock on numDBs_lock
    //
3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851
    if (!num_DBs_locked_in_bulk) {
        rw_rdlock(&share->num_DBs_lock);
    }
    else {
        lock_count++;
        if (lock_count >= 2000) {
            rw_unlock(&share->num_DBs_lock);
            rw_rdlock(&share->num_DBs_lock);
            lock_count = 0;
        }
    }
3852
    curr_num_DBs = share->num_DBs;
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3853 3854 3855 3856
    
    if (hidden_primary_key) {
        get_auto_primary_key(current_ident);
    }
3857

3858 3859 3860
    if (table_share->blob_fields) {
        if (fix_rec_buff_for_blob(max_row_length(record))) {
            error = HA_ERR_OUT_OF_MEM;
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3861 3862 3863
            goto cleanup;
        }
    }
3864

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3865 3866
    create_dbt_key_from_table(&prim_key, primary_key, primary_key_buff, record, &has_null);
    if ((error = pack_row(&row, (const uchar *) record, primary_key))){
3867
        goto cleanup;
3868 3869
    }

3870
    create_sub_trans = (using_ignore && !(do_ignore_flag_optimization(thd,table,share->replace_into_fast)));
3871
    if (create_sub_trans) {
3872
        error = db_env->txn_begin(db_env, transaction, &sub_trans, DB_INHERIT_ISOLATION);
3873 3874 3875
        if (error) {
            goto cleanup;
        }
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3876
    }
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3877
    
3878
    txn = create_sub_trans ? sub_trans : transaction;    
3879

3880
    handle_rec_buff_for_hot_index();
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3881
    //
3882
    // make sure the buffers for the rows are big enough
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3883
    //
3884
    fix_mult_rec_buff();
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3885

3886
    if (tokudb_debug & TOKUDB_DEBUG_CHECK_KEY) {
3887
        test_row_packing(record,&prim_key,&row);
3888
    }
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3889

3890 3891 3892 3893 3894 3895
    if (loader) {
        error = loader->put(loader, &prim_key, &row);
        if (error) {
            abort_loader = true;
            goto cleanup;
        }
3896 3897
    }
    else {
3898 3899 3900 3901 3902 3903 3904
        if (curr_num_DBs == 1) {
            error = insert_row_to_main_dictionary(record,&prim_key, &row, txn);
            if (error) { goto cleanup; }
        }
        else {
            error = do_uniqueness_checks(record, txn, thd);
            if (error) { goto cleanup; }
3905

3906 3907 3908
            error = insert_rows_to_dictionaries_mult(&prim_key, &row, txn, thd);
            if (error) { goto cleanup; }
        }
3909
    }
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3910

3911
    trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
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3912 3913
    if (!error) {
        added_rows++;
3914 3915
        trx->stmt_progress.inserted++;
        track_progress(thd);
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3916 3917
    }
cleanup:
3918 3919 3920
    if (!num_DBs_locked_in_bulk) {
       rw_unlock(&share->num_DBs_lock);
    }
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3921
    if (error == DB_KEYEXIST) {
3922
        error = HA_ERR_FOUND_DUPP_KEY;
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3923
    }
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3924 3925 3926 3927 3928
    if (sub_trans) {
        // no point in recording error value of abort.
        // nothing we can do about it anyway and it is not what
        // we want to return.
        if (error) {
3929
            abort_txn(sub_trans);
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3930 3931
        }
        else {
3932
            commit_txn(sub_trans, DB_TXN_NOSYNC);
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3933 3934
        }
    }
3935
    TOKUDB_DBUG_RETURN(error);
3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955
}

/* Compare if a key in a row has changed */
int ha_tokudb::key_cmp(uint keynr, const uchar * old_row, const uchar * new_row) {
    KEY_PART_INFO *key_part = table->key_info[keynr].key_part;
    KEY_PART_INFO *end = key_part + table->key_info[keynr].key_parts;

    for (; key_part != end; key_part++) {
        if (key_part->null_bit) {
            if ((old_row[key_part->null_offset] & key_part->null_bit) != (new_row[key_part->null_offset] & key_part->null_bit))
                return 1;
        }
        if (key_part->key_part_flag & (HA_BLOB_PART | HA_VAR_LENGTH_PART)) {

            if (key_part->field->cmp_binary((uchar *) (old_row + key_part->offset), (uchar *) (new_row + key_part->offset), (ulong) key_part->length))
                return 1;
        } else {
            if (memcmp(old_row + key_part->offset, new_row + key_part->offset, key_part->length))
                return 1;
        }
3956
    }
3957
    return 0;
3958 3959
}

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3960 3961 3962 3963 3964 3965 3966 3967 3968
//
// Updates a row in the table, called when handling an UPDATE query
// Parameters:
//      [in]    old_row - row to be updated, in MySQL format
//      [in]    new_row - new row, in MySQL format
// Returns:
//      0 on success
//      error otherwise
//
3969
int ha_tokudb::update_row(const uchar * old_row, uchar * new_row) {
3970
    TOKUDB_DBUG_ENTER("update_row");
3971
    DBT prim_key, old_prim_key, prim_row, old_prim_row;
3972 3973
    int error;
    bool primary_key_changed;
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3974 3975
    bool has_null;
    THD* thd = ha_thd();
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3976 3977
    DB_TXN* sub_trans = NULL;
    DB_TXN* txn = NULL;
3978
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
3979
    uint curr_num_DBs;
3980
    ulonglong wait_lock_time = get_write_lock_wait_time(thd);
3981 3982

    LINT_INIT(error);
3983 3984 3985
    bzero((void *) &prim_key, sizeof(prim_key));
    bzero((void *) &old_prim_key, sizeof(old_prim_key));
    bzero((void *) &prim_row, sizeof(prim_row));
3986
    bzero((void *) &old_prim_row, sizeof(old_prim_row));
3987 3988


3989
    statistic_increment(table->in_use->status_var.ha_update_count, &LOCK_status);
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Zardosht Kasheff committed
3990
    if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE) {
3991
        table->timestamp_field->set_time();
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3992
    }
3993

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3994 3995 3996 3997 3998 3999 4000 4001 4002 4003
    //
    // check to see if some value for the auto increment column that is bigger
    // than anything else til now is being used. If so, update the metadata to reflect it
    // the goal here is we never want to have a dup key error due to a bad increment
    // of the auto inc field.
    //
    if (share->has_auto_inc && new_row == table->record[0]) {
        pthread_mutex_lock(&share->mutex);
        ulonglong curr_auto_inc = retrieve_auto_increment(
            table->field[share->ai_field_index]->key_type(), 
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4004
            field_offset(table->field[share->ai_field_index], table),
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4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015
            new_row
            );
        if (curr_auto_inc > share->last_auto_increment) {
            error = update_max_auto_inc(share->status_block, curr_auto_inc);
            if (!error) {
                share->last_auto_increment = curr_auto_inc;
            }
        }
        pthread_mutex_unlock(&share->mutex);
    }

4016 4017 4018 4019 4020 4021
    //
    // grab reader lock on numDBs_lock
    //
    rw_rdlock(&share->num_DBs_lock);
    curr_num_DBs = share->num_DBs;

4022 4023 4024 4025 4026
    if (using_ignore) {
        error = db_env->txn_begin(db_env, transaction, &sub_trans, DB_INHERIT_ISOLATION);
        if (error) {
            goto cleanup;
        }
4027
    }
4028
    txn = using_ignore ? sub_trans : transaction;
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4029 4030


4031 4032 4033 4034 4035 4036
    if (hidden_primary_key) {
        primary_key_changed = 0;
        bzero((void *) &prim_key, sizeof(prim_key));
        prim_key.data = (void *) current_ident;
        prim_key.size = TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH;
        old_prim_key = prim_key;
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4037 4038
    } 
    else {
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4039
        create_dbt_key_from_table(&prim_key, primary_key, key_buff, new_row, &has_null);
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4040
        if ((primary_key_changed = key_cmp(primary_key, old_row, new_row))) {
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4041
            create_dbt_key_from_table(&old_prim_key, primary_key, primary_key_buff, old_row, &has_null);
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4042 4043
        }
        else {
4044
            old_prim_key = prim_key;
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4045
        }
4046 4047
    }

4048 4049 4050 4051 4052
    //
    // do uniqueness checks
    //
    if (share->has_unique_keys && !thd_test_options(thd, OPTION_RELAXED_UNIQUE_CHECKS)) {
        for (uint keynr = 0; keynr < table_share->keys; keynr++) {
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4053
            bool is_unique_key = table->key_info[keynr].flags & HA_NOSAME;
4054 4055
            if (keynr == primary_key) {
                continue;
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4056
            }
4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067
            if (is_unique_key) {
                bool key_changed = key_cmp(keynr, old_row, new_row);
                if (key_changed) {
                    bool is_unique;
                    error = is_val_unique(&is_unique, new_row, &table->key_info[keynr], keynr, txn);
                    if (error) goto cleanup;
                    if (!is_unique) {
                        error = DB_KEYEXIST;
                        last_dup_key = keynr;
                        goto cleanup;
                    }
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4068
                }
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4069
            }
4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080
        }
    }
    
    if (table_share->blob_fields) {
        if (fix_rec_buff_for_blob(max_row_length(new_row))) {
            error = HA_ERR_OUT_OF_MEM;
            goto cleanup;
        }
        if (fix_rec_update_buff_for_blob(max_row_length(old_row))) {
            error = HA_ERR_OUT_OF_MEM;
            goto cleanup;
4081 4082
        }
    }
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4083

4084 4085 4086 4087 4088 4089
    error = pack_row(&prim_row, new_row, primary_key);
    if (error) { goto cleanup; }

    error = pack_old_row_for_update(&old_prim_row, old_row, primary_key);
    if (error) { goto cleanup; }

4090 4091 4092 4093 4094
    //
    // make sure the buffers for the rows are big enough
    //
    fix_mult_rec_buff();

4095
    set_main_dict_put_flags(thd, &mult_put_flags[primary_key], false);
4096
    handle_rec_buff_for_hot_index();
4097
    lockretryN(wait_lock_time){
4098
        error = db_env->update_multiple(
4099
            db_env, 
4100 4101 4102 4103
            share->key_file[primary_key], 
            txn,
            &old_prim_key, 
            &old_prim_row,
4104 4105
            &prim_key, 
            &prim_row,
4106 4107 4108 4109 4110 4111
            curr_num_DBs, 
            share->key_file,
            mult_put_flags,
            2*curr_num_DBs, 
            mult_key_dbt,
            curr_num_DBs, 
4112
            mult_rec_dbt
4113 4114
            );
        lockretry_wait;
4115
    }
4116 4117 4118 4119
    if (error == DB_KEYEXIST) {
        last_dup_key = primary_key;
    }    
    else if (!error) {
4120 4121
        trx->stmt_progress.updated++;
        track_progress(thd);
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4122
    }
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4125
cleanup:
4126
    rw_unlock(&share->num_DBs_lock);
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4127
    if (error == DB_KEYEXIST) {
4128
        error = HA_ERR_FOUND_DUPP_KEY;
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4129
    }
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    if (sub_trans) {
        // no point in recording error value of abort.
        // nothing we can do about it anyway and it is not what
        // we want to return.
        if (error) {
4135
            abort_txn(sub_trans);
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        }
        else {
4138
            commit_txn(sub_trans, DB_TXN_NOSYNC);
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        }
    }
4141
    TOKUDB_DBUG_RETURN(error);
4142 4143
}

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4144
//
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4145
// Deletes a row in the table, called when handling a DELETE query
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// Parameters:
//      [in]    record - row to be deleted, in MySQL format
// Returns:
//      0 on success
//      error otherwise
//
4152
int ha_tokudb::delete_row(const uchar * record) {
4153
    TOKUDB_DBUG_ENTER("ha_tokudb::delete_row");
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4154
    int error = ENOSYS;
4155
    DBT row, prim_key;
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4156
    bool has_null;
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4157
    THD* thd = ha_thd();
4158
    ulonglong wait_lock_time = get_write_lock_wait_time(thd);
4159
    uint curr_num_DBs;
4160
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);;
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4161

4162 4163
    statistic_increment(table->in_use->status_var.ha_delete_count, &LOCK_status);

4164 4165 4166 4167 4168 4169
    //
    // grab reader lock on numDBs_lock
    //
    rw_rdlock(&share->num_DBs_lock);
    curr_num_DBs = share->num_DBs;

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4170
    create_dbt_key_from_table(&prim_key, primary_key, key_buff, record, &has_null);
4171 4172 4173 4174 4175
    if (table_share->blob_fields) {
        if (fix_rec_buff_for_blob(max_row_length(record))) {
            error = HA_ERR_OUT_OF_MEM;
            goto cleanup;
        }
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4176
    }
4177 4178 4179 4180 4181 4182
    if ((error = pack_row(&row, (const uchar *) record, primary_key))){
        goto cleanup;
    }
    lockretryN(wait_lock_time){
        error = db_env->del_multiple(
            db_env, 
4183
            share->key_file[primary_key], 
4184 4185 4186 4187 4188 4189
            transaction, 
            &prim_key, 
            &row,
            curr_num_DBs, 
            share->key_file, 
            mult_key_dbt,
4190
            mult_del_flags
4191 4192 4193 4194
            );
        lockretry_wait;
    }

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    if (error) {
        DBUG_PRINT("error", ("Got error %d", error));
4197
    }
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4198
    else {
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4199
        deleted_rows++;
4200 4201
        trx->stmt_progress.deleted++;
        track_progress(thd);
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4202
    }
4203
cleanup:
4204
    rw_unlock(&share->num_DBs_lock);
4205
    TOKUDB_DBUG_RETURN(error);
4206 4207
}

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//
// takes as input table->read_set and table->write_set
// and puts list of field indexes that need to be read in
// unpack_row in the member variables fixed_cols_for_query
// and var_cols_for_query
//
void ha_tokudb::set_query_columns(uint keynr) {
    u_int32_t curr_fixed_col_index = 0;
    u_int32_t curr_var_col_index = 0;
    read_key = false;
    read_blobs = false;
    //
    // i know this is probably confusing and will need to be explained better
    //
    uint key_index = 0;

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4224
    if (keynr == primary_key || keynr == MAX_KEY) {
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        key_index = primary_key;
    }
    else {
        key_index = (table->key_info[keynr].flags & HA_CLUSTERING ? keynr : primary_key);
    }
    for (uint i = 0; i < table_share->fields; i++) {
        if (bitmap_is_set(table->read_set,i) || 
            bitmap_is_set(table->write_set,i)
            ) 
        {
4235
            if (bitmap_is_set(&share->kc_info.key_filters[key_index],i)) {
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                read_key = true;
            }
            else {
                //
                // if fixed field length
                //
4242
                if (share->kc_info.field_lengths[i] != 0) {
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                    //
                    // save the offset into the list
                    //
                    fixed_cols_for_query[curr_fixed_col_index] = i;
                    curr_fixed_col_index++;
                }
                //
                // varchar or varbinary
                //
4252
                else if (share->kc_info.length_bytes[i] != 0) {
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                    var_cols_for_query[curr_var_col_index] = i;
                    curr_var_col_index++;
                }
                //
                // it is a blob
                //
                else {
                    read_blobs = true;
                }
            }
        }
    }
    num_fixed_cols_for_query = curr_fixed_col_index;
    num_var_cols_for_query = curr_var_col_index;
}

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4269
void ha_tokudb::column_bitmaps_signal() {
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    //
    // if we have max number of indexes, then MAX_KEY == primary_key
    //
    if (active_index != MAX_KEY || active_index == primary_key) {
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        set_query_columns(active_index);
    }
}
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4277

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//
// Notification that a scan of entire secondary table is about
// to take place. Will pre acquire table read lock
// Returns:
//      0 on success
//      error otherwise
//
int ha_tokudb::prepare_index_scan() {
4286
    int error = 0;
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4287
    DB* db = share->key_file[active_index];
4288
    HANDLE_INVALID_CURSOR();
4289
    lockretryN(read_lock_wait_time){
4290
        error = cursor->c_pre_acquire_range_lock(
4291 4292
            cursor, 
            db->dbt_neg_infty(),  
4293
            db->dbt_pos_infty()
4294 4295 4296
            );
        lockretry_wait;
    }
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    if (error) { last_cursor_error = error; goto cleanup; }

    range_lock_grabbed = true;
    error = 0;
cleanup:
    return error;
}


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//
// Notification that a range query getting all elements that equal a key
//  to take place. Will pre acquire read lock
// Returns:
//      0 on success
//      error otherwise
//
int ha_tokudb::prepare_index_key_scan( const uchar * key, uint key_len ) {
    int error = 0;
    DBT start_key, end_key;
4316
    HANDLE_INVALID_CURSOR();
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4317
    pack_key(&start_key, active_index, key_buff, key, key_len, COL_NEG_INF);
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4318
    pack_key(&end_key, active_index, key_buff2, key, key_len, COL_POS_INF);
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4319

4320
    lockretryN(read_lock_wait_time){
4321
        error = cursor->c_pre_acquire_range_lock(
4322
            cursor, 
4323
            &start_key, 
4324
            &end_key 
4325 4326 4327
            );
        lockretry_wait;            
    }
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    if (error){ 
        goto cleanup; 
    }

    range_lock_grabbed = true;
    error = 0;
cleanup:
    if (error) {
        last_cursor_error = error;
        //
        // cursor should be initialized here, but in case it is not, we still check
        //
        if (cursor) {
4341 4342
            int r = cursor->c_close(cursor);
            assert(r==0);
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            cursor = NULL;
        }
    }
    return error;
}



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//
// Initializes local cursor on DB with index keynr
// Parameters:
//          keynr - key (index) number
//          sorted - 1 if result MUST be sorted according to index
// Returns:
//      0 on success
//      error otherwise
//
4360
int ha_tokudb::index_init(uint keynr, bool sorted) {
4361
    TOKUDB_DBUG_ENTER("ha_tokudb::index_init %p %d", this, keynr);
4362
    int error;
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4363
    THD* thd = ha_thd(); 
4364
    DBUG_PRINT("enter", ("table: '%s'  key: %d", table_share->table_name.str, keynr));
4365
    read_lock_wait_time = get_read_lock_wait_time(ha_thd());
4366 4367 4368 4369 4370 4371 4372

    /*
       Under some very rare conditions (like full joins) we may already have
       an active cursor at this point
     */
    if (cursor) {
        DBUG_PRINT("note", ("Closing active cursor"));
4373 4374
        int r = cursor->c_close(cursor);
        assert(r==0);
4375 4376
    }
    active_index = keynr;
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4377
    last_cursor_error = 0;
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4378
    range_lock_grabbed = false;
4379
    DBUG_ASSERT(keynr <= table->s->keys);
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4380
    DBUG_ASSERT(share->key_file[keynr]);
4381
    cursor_flags = get_cursor_isolation_flags(lock.type, thd);
4382 4383
    if (use_write_locks)
        cursor_flags |= DB_RMW;
4384 4385
    if ((error = share->key_file[keynr]->cursor(share->key_file[keynr], transaction, &cursor, cursor_flags))) {
        if (error == TOKUDB_MVCC_DICTIONARY_TOO_NEW) {
4386
            error = HA_ERR_TABLE_DEF_CHANGED;
4387 4388
            my_error(ER_TABLE_DEF_CHANGED, MYF(0));
        }
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        if (error == DB_LOCK_NOTGRANTED) {
            error = HA_ERR_LOCK_WAIT_TIMEOUT;
            my_error(ER_LOCK_WAIT_TIMEOUT, MYF(0));
        }
4393
        table->status = STATUS_NOT_FOUND;
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4394
        last_cursor_error = error;
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4395
        cursor = NULL;             // Safety
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4396
        goto exit;
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4397
    }
4398
    bzero((void *) &last_key, sizeof(last_key));
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    if (thd_sql_command(thd) == SQLCOM_SELECT) {
        set_query_columns(keynr);
        unpack_entire_row = false;
    }
    else {
        unpack_entire_row = true;
    }
    error = 0;
exit:
4409
    TOKUDB_DBUG_RETURN(error);
4410 4411
}

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//
// closes the local cursor
//
4415
int ha_tokudb::index_end() {
4416
    TOKUDB_DBUG_ENTER("ha_tokudb::index_end %p", this);
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4417
    range_lock_grabbed = false;
4418 4419
    if (cursor) {
        DBUG_PRINT("enter", ("table: '%s'", table_share->table_name.str));
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4420 4421
        int r = cursor->c_close(cursor);
        assert(r==0);
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4422
        cursor = NULL;
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4423
        last_cursor_error = 0;
4424
    }
4425
    active_index = MAX_KEY;
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    //
    // reset query variables
    //
    unpack_entire_row = true;
    read_blobs = true;
    read_key = true;
    num_fixed_cols_for_query = 0;
    num_var_cols_for_query = 0;
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4435
    TOKUDB_DBUG_RETURN(0);
4436 4437
}

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int ha_tokudb::handle_cursor_error(int error, int err_to_return, uint keynr) {
    TOKUDB_DBUG_ENTER("ha_tokudb::handle_cursor_error");
4441
    if (error) {
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4442 4443 4444
        if (error == DB_LOCK_NOTGRANTED) {
            error = HA_ERR_LOCK_WAIT_TIMEOUT;
        }
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4445
        last_cursor_error = error;
4446
        table->status = STATUS_NOT_FOUND;
4447 4448
        int r = cursor->c_close(cursor);
        assert(r==0);
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4449
        cursor = NULL;
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4450
        if (error == DB_NOTFOUND) {
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4451
            error = err_to_return;
4452
            if ((share->key_file[keynr]->cursor(share->key_file[keynr], transaction, &cursor, cursor_flags))) {
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                cursor = NULL;             // Safety
            }
        }
4456
    }
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    TOKUDB_DBUG_RETURN(error);
}


//
// Helper function for read_row and smart_dbt_callback_xxx functions
// When using a hidden primary key, upon reading a row, 
// we set the current_ident field to whatever the primary key we retrieved
// was
//
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4467
void ha_tokudb::extract_hidden_primary_key(uint keynr, DBT const *found_key) {
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4468
    //
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4469
    // extract hidden primary key to current_ident
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4470 4471
    //
    if (hidden_primary_key) {
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        if (keynr == primary_key) {
            memcpy_fixed(current_ident, (char *) found_key->data, TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH);
        }
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        //
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        // if secondary key, hidden primary key is at end of found_key
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        //
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        else {
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            memcpy_fixed(
                current_ident, 
                (char *) found_key->data + found_key->size - TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH, 
                TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH
                );
        }
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4485
    }
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}

4488

4489
int ha_tokudb::read_row_callback (uchar * buf, uint keynr, DBT const *row, DBT const *found_key) {
4490
    assert(keynr == primary_key);
4491
    return unpack_row(buf, row,found_key, keynr);
4492 4493
}

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//
// Reads the contents of row and found_key, DBT's retrieved from the DB associated to keynr, into buf
// This function assumes that we are using a covering index, as a result, if keynr is the primary key,
// we do not read row into buf
// Parameters:
//      [out]   buf - buffer for the row, in MySQL format
//              keynr - index into key_file that represents DB we are currently operating on.
//      [in]    row - the row that has been read from the preceding DB call
//      [in]    found_key - key used to retrieve the row
//
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4504
void ha_tokudb::read_key_only(uchar * buf, uint keynr, DBT const *found_key) {
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    TOKUDB_DBUG_ENTER("ha_tokudb::read_key_only");
    table->status = 0;
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    //
    // only case when we do not unpack the key is if we are dealing with the main dictionary
    // of a table with a hidden primary key
    //
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    if (!(hidden_primary_key && keynr == primary_key)) {
        unpack_key(buf, found_key, keynr);
    }
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    DBUG_VOID_RETURN;
}

//
// Helper function used to try to retrieve the entire row
// If keynr is associated with the main table, reads contents of found_key and row into buf, otherwise,
// makes copy of primary key and saves it to last_key. This can later be used to retrieve the entire row
// Parameters:
//      [out]   buf - buffer for the row, in MySQL format
//              keynr - index into key_file that represents DB we are currently operating on.
//      [in]    row - the row that has been read from the preceding DB call
//      [in]    found_key - key used to retrieve the row
//
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int ha_tokudb::read_primary_key(uchar * buf, uint keynr, DBT const *row, DBT const *found_key) {
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4528
    TOKUDB_DBUG_ENTER("ha_tokudb::read_primary_key");
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4529
    int error = 0;
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4530
    table->status = 0;
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    //
    // case where we read from secondary table that is not clustered
    //
    if (keynr != primary_key && !(table->key_info[keynr].flags & HA_CLUSTERING)) {
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4535
        bool has_null;
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        //
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        // create a DBT that has the same data as row, this is inefficient
        // extract_hidden_primary_key MUST have been called before this
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        //
        bzero((void *) &last_key, sizeof(last_key));
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        if (!hidden_primary_key) {
            unpack_key(buf, found_key, keynr);
        }
        create_dbt_key_from_table(
            &last_key, 
            primary_key,
            key_buff,
            buf,
            &has_null
            );
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4551
    }
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    //
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4553
    // else read from clustered/primary key
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    //
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    else {
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        error = unpack_row(buf, row, found_key, keynr);
        if (error) { goto exit; }
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    }
    if (found_key) { DBUG_DUMP("read row key", (uchar *) found_key->data, found_key->size); }
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    error = 0;
exit:
    TOKUDB_DBUG_RETURN(error);
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}

//
// This function reads an entire row into buf. This function also assumes that
// the key needed to retrieve the row is stored in the member variable last_key
// Parameters:
//      [out]   buf - buffer for the row, in MySQL format
// Returns:
//      0 on success, error otherwise
//
int ha_tokudb::read_full_row(uchar * buf) {
    TOKUDB_DBUG_ENTER("ha_tokudb::read_full_row");
4575
    int error = 0;
4576 4577 4578 4579
    struct smart_dbt_info info;
    info.ha = this;
    info.buf = buf;
    info.keynr = primary_key;
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4580
    //
4581
    // assumes key is stored in this->last_key
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4582
    //
4583
    lockretryN(read_lock_wait_time){
4584 4585 4586
        error = share->file->getf_set(
            share->file, 
            transaction, 
4587
            cursor_flags, 
4588 4589 4590 4591 4592 4593
            &last_key, 
            smart_dbt_callback_rowread_ptquery, 
            &info
            );
        lockretry_wait;
    }
4594
    if (error) {
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4595 4596 4597
        if (error == DB_LOCK_NOTGRANTED) {
            error = HA_ERR_LOCK_WAIT_TIMEOUT;
        }
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4598 4599 4600 4601
        table->status = STATUS_NOT_FOUND;
        TOKUDB_DBUG_RETURN(error == DB_NOTFOUND ? HA_ERR_CRASHED : error);
    }

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4602
    TOKUDB_DBUG_RETURN(error);
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}


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4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618
// 
// Reads the next row matching to the key, on success, advances cursor 
// Parameters: 
//      [out]   buf - buffer for the next row, in MySQL format 
//      [in]     key - key value 
//                keylen - length of key 
// Returns: 
//      0 on success 
//      HA_ERR_END_OF_FILE if not found 
//      error otherwise 
// 
int ha_tokudb::index_next_same(uchar * buf, const uchar * key, uint keylen) { 
    TOKUDB_DBUG_ENTER("ha_tokudb::index_next_same %p", this); 
4619
    int error = 0; 
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4620 4621 4622 4623 4624
    struct smart_dbt_info info; 
    DBT curr_key;
    DBT found_key;
    bool has_null;
    int cmp;
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4625
    u_int32_t flags;
4626 4627
    THD* thd = ha_thd();
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);;
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4628 4629 4630 4631 4632 4633 4634
    HANDLE_INVALID_CURSOR(); 

    statistic_increment(table->in_use->status_var.ha_read_next_count, &LOCK_status); 
    info.ha = this; 
    info.buf = buf; 
    info.keynr = active_index; 

4635
    pack_key(&curr_key, active_index, key_buff2, key, keylen, COL_ZERO);
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4636

4637
    flags = SET_PRELOCK_FLAG(0); 
4638
    lockretryN(read_lock_wait_time){
4639 4640 4641 4642
        error = cursor->c_getf_next(cursor, flags, SMART_DBT_CALLBACK, &info);
        lockretry_wait;
    }
    error = handle_cursor_error(error, HA_ERR_END_OF_FILE,active_index);
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    if (error) {
        goto cleanup;
    }
    if (!key_read && active_index != primary_key && !(table->key_info[active_index].flags & HA_CLUSTERING)) { 
        error = read_full_row(buf); 
        if (error) {
            goto cleanup;
        }
    } 
    //
    // now do the comparison
    //
    create_dbt_key_from_table(&found_key,active_index,key_buff3,buf,&has_null);
    cmp = tokudb_prefix_cmp_dbt_key(share->key_file[active_index], &curr_key, &found_key);
    if (cmp) {
        error = HA_ERR_END_OF_FILE; 
    }
4660 4661
    trx->stmt_progress.queried++;
    track_progress(thd);
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4662 4663 4664 4665 4666
 cleanup: 
    TOKUDB_DBUG_RETURN(error); 
 } 


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//
// According to InnoDB handlerton: Positions an index cursor to the index 
// specified in keynr. Fetches the row if any
// Parameters:
//      [out]       buf - buffer for the  returned row
//      [in]         key - key value, according to InnoDB, if NULL, 
//                              position cursor at start or end of index,
//                              not sure if this is done now
//                    key_len - length of key
//                    find_flag - according to InnoDB, search flags from my_base.h
// Returns:
//      0 on success
//      HA_ERR_KEY_NOT_FOUND if not found (per InnoDB), 
//          we seem to return HA_ERR_END_OF_FILE if find_flag != HA_READ_KEY_EXACT
//          TODO: investigate this for correctness
//      error otherwise
//
4684 4685
int ha_tokudb::index_read(uchar * buf, const uchar * key, uint key_len, enum ha_rkey_function find_flag) {
    TOKUDB_DBUG_ENTER("ha_tokudb::index_read %p find %d", this, find_flag);
4686
    // TOKUDB_DBUG_DUMP("key=", key, key_len);
4687
    DBT row;
4688
    DBT lookup_key;
4689
    int error = 0;    
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4690
    u_int32_t flags = 0;
4691 4692
    THD* thd = ha_thd();
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);;
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4693
    struct smart_dbt_info info;
4694
    struct index_read_info ir_info;
4695

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4696
    HANDLE_INVALID_CURSOR();
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4698 4699 4700
    table->in_use->status_var.ha_read_key_count++;
    bzero((void *) &row, sizeof(row));

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    info.ha = this;
    info.buf = buf;
    info.keynr = active_index;

4705
    ir_info.smart_dbt_info = info;
4706
    ir_info.cmp = 0;
4707

4708
    flags = SET_PRELOCK_FLAG(0);
4709
    switch (find_flag) {
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4710
    case HA_READ_KEY_EXACT: /* Find first record else error */
4711
        pack_key(&lookup_key, active_index, key_buff3, key, key_len, COL_NEG_INF);
4712
        ir_info.orig_key = &lookup_key;
4713 4714 4715 4716
        lockretryN(read_lock_wait_time){
            error = cursor->c_getf_set_range(cursor, flags, &lookup_key, SMART_DBT_IR_CALLBACK, &ir_info);
            lockretry_wait;
        }
4717 4718
        if (ir_info.cmp) {
            error = DB_NOTFOUND;
4719
        }
4720
        break;
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4721
    case HA_READ_AFTER_KEY: /* Find next rec. after key-record */
4722
        pack_key(&lookup_key, active_index, key_buff3, key, key_len, COL_POS_INF);
4723 4724 4725 4726
        lockretryN(read_lock_wait_time){
            error = cursor->c_getf_set_range(cursor, flags, &lookup_key, SMART_DBT_CALLBACK, &info);
            lockretry_wait;
        }
4727
        break;
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4728
    case HA_READ_BEFORE_KEY: /* Find next rec. before key-record */
4729
        pack_key(&lookup_key, active_index, key_buff3, key, key_len, COL_NEG_INF);
4730 4731 4732 4733
        lockretryN(read_lock_wait_time){
            error = cursor->c_getf_set_range_reverse(cursor, flags, &lookup_key, SMART_DBT_CALLBACK, &info);
            lockretry_wait;
        }
4734
        break;
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4735
    case HA_READ_KEY_OR_NEXT: /* Record or next record */
4736
        pack_key(&lookup_key, active_index, key_buff3, key, key_len, COL_NEG_INF);
4737 4738 4739 4740
        lockretryN(read_lock_wait_time){
            error = cursor->c_getf_set_range(cursor, flags, &lookup_key, SMART_DBT_CALLBACK, &info);
            lockretry_wait;
        }
4741
        break;
4742 4743 4744
    //
    // This case does not seem to ever be used, it is ok for it to be slow
    //
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4745
    case HA_READ_KEY_OR_PREV: /* Record or previous */
4746
        pack_key(&lookup_key, active_index, key_buff3, key, key_len, COL_NEG_INF);
4747
        ir_info.orig_key = &lookup_key;
4748 4749 4750 4751
        lockretryN(read_lock_wait_time){
            error = cursor->c_getf_set_range(cursor, flags, &lookup_key, SMART_DBT_IR_CALLBACK, &ir_info);
            lockretry_wait;
        }
4752
        if (error == DB_NOTFOUND) {
4753 4754
            error = cursor->c_getf_last(cursor, flags, SMART_DBT_CALLBACK, &info);
        }
4755 4756 4757
        else if (ir_info.cmp) {
            error = cursor->c_getf_prev(cursor, flags, SMART_DBT_CALLBACK, &info);
        }
4758
        break;
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4759
    case HA_READ_PREFIX_LAST_OR_PREV: /* Last or prev key with the same prefix */
4760
        pack_key(&lookup_key, active_index, key_buff3, key, key_len, COL_POS_INF);
4761 4762 4763 4764
        lockretryN(read_lock_wait_time){
            error = cursor->c_getf_set_range_reverse(cursor, flags, &lookup_key, SMART_DBT_CALLBACK, &info);
            lockretry_wait;
        }
4765
        break;
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4766
    case HA_READ_PREFIX_LAST:
4767
        pack_key(&lookup_key, active_index, key_buff3, key, key_len, COL_POS_INF);
4768
        ir_info.orig_key = &lookup_key;
4769 4770 4771 4772
        lockretryN(read_lock_wait_time){
            error = cursor->c_getf_set_range_reverse(cursor, flags, &lookup_key, SMART_DBT_IR_CALLBACK, &ir_info);
            lockretry_wait;
        }
4773 4774
        if (ir_info.cmp) {
            error = DB_NOTFOUND;
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4775 4776
        }
        break;
4777
    default:
4778
        TOKUDB_TRACE("unsupported:%d\n", find_flag);
4779
        error = HA_ERR_UNSUPPORTED;
4780
        break;
4781
    }
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4782
    error = handle_cursor_error(error,HA_ERR_KEY_NOT_FOUND,active_index);
4783
    if (!error && !key_read && active_index != primary_key && !(table->key_info[active_index].flags & HA_CLUSTERING)) {
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4784
        error = read_full_row(buf);
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4785
    }
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4786 4787 4788 4789
    
    if (error && (tokudb_debug & TOKUDB_DEBUG_ERROR)) {
        TOKUDB_TRACE("error:%d:%d\n", error, find_flag);
    }
4790 4791 4792
    trx->stmt_progress.queried++;
    track_progress(thd);

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4793
cleanup:
4794
    TOKUDB_DBUG_RETURN(error);
4795 4796
}

4797 4798


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4799 4800 4801 4802 4803 4804 4805 4806 4807
//
// Reads the next row from the active index (cursor) into buf, and advances cursor
// Parameters:
//      [out]   buf - buffer for the next row, in MySQL format
// Returns:
//      0 on success
//      HA_ERR_END_OF_FILE if not found
//      error otherwise
//
4808
int ha_tokudb::index_next(uchar * buf) {
4809
    TOKUDB_DBUG_ENTER("ha_tokudb::index_next");
4810
    int error = 0; 
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4811
    struct smart_dbt_info info;
4812
    u_int32_t flags = SET_PRELOCK_FLAG(0);
4813 4814
    THD* thd = ha_thd();
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);;
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4815
    HANDLE_INVALID_CURSOR();
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4816
    
4817
    statistic_increment(table->in_use->status_var.ha_read_next_count, &LOCK_status);
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4818 4819 4820 4821

    info.ha = this;
    info.buf = buf;
    info.keynr = active_index;
4822

4823
    lockretryN(read_lock_wait_time){
4824 4825 4826 4827
        error = cursor->c_getf_next(cursor, flags, SMART_DBT_CALLBACK, &info);
        lockretry_wait;
    }
    error = handle_cursor_error(error, HA_ERR_END_OF_FILE,active_index);
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4828 4829 4830 4831
    //
    // still need to get entire contents of the row if operation done on
    // secondary DB and it was NOT a covering index
    //
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4832
    if (!error && !key_read && (active_index != primary_key) && !(table->key_info[active_index].flags & HA_CLUSTERING) ) {
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4833 4834
        error = read_full_row(buf);
    }
4835 4836
    trx->stmt_progress.queried++;
    track_progress(thd);
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4837
cleanup:
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4838
    TOKUDB_DBUG_RETURN(error);
4839 4840
}

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4841 4842 4843 4844 4845 4846

int ha_tokudb::index_read_last(uchar * buf, const uchar * key, uint key_len) {
    return(index_read(buf, key, key_len, HA_READ_PREFIX_LAST));    
}


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4847 4848 4849 4850 4851 4852 4853 4854 4855
//
// Reads the previous row from the active index (cursor) into buf, and advances cursor
// Parameters:
//      [out]   buf - buffer for the next row, in MySQL format
// Returns:
//      0 on success
//      HA_ERR_END_OF_FILE if not found
//      error otherwise
//
4856
int ha_tokudb::index_prev(uchar * buf) {
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4857
    TOKUDB_DBUG_ENTER("ha_tokudb::index_next");
4858
    int error = 0; 
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4859
    struct smart_dbt_info info;
4860
    u_int32_t flags = SET_PRELOCK_FLAG(0);
4861 4862
    THD* thd = ha_thd();
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);;
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4863 4864 4865 4866 4867 4868 4869
    HANDLE_INVALID_CURSOR();
    
    statistic_increment(table->in_use->status_var.ha_read_next_count, &LOCK_status);

    info.ha = this;
    info.buf = buf;
    info.keynr = active_index;
4870

4871
    lockretryN(read_lock_wait_time){
4872 4873 4874 4875 4876
        error = cursor->c_getf_prev(cursor, flags, SMART_DBT_CALLBACK, &info);
        lockretry_wait;
    }
    error = handle_cursor_error(error,HA_ERR_END_OF_FILE,active_index);

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4877 4878 4879 4880
    //
    // still need to get entire contents of the row if operation done on
    // secondary DB and it was NOT a covering index
    //
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4881
    if (!error && !key_read && (active_index != primary_key) && !(table->key_info[active_index].flags & HA_CLUSTERING) ) {
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        error = read_full_row(buf);
    }
4884 4885 4886
    trx->stmt_progress.queried++;
    track_progress(thd);
    
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4887
cleanup:
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4888
    TOKUDB_DBUG_RETURN(error);
4889 4890
}

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//
// Reads the first row from the active index (cursor) into buf, and advances cursor
// Parameters:
//      [out]   buf - buffer for the next row, in MySQL format
// Returns:
//      0 on success
//      HA_ERR_END_OF_FILE if not found
//      error otherwise
//
4900
int ha_tokudb::index_first(uchar * buf) {
4901
    TOKUDB_DBUG_ENTER("ha_tokudb::index_first");
4902
    int error = 0;
4903
    struct smart_dbt_info info;
4904
    u_int32_t flags = SET_PRELOCK_FLAG(0);
4905 4906
    THD* thd = ha_thd();
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);;
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4907
    HANDLE_INVALID_CURSOR();
4908

4909
    statistic_increment(table->in_use->status_var.ha_read_first_count, &LOCK_status);
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4911 4912 4913 4914
    info.ha = this;
    info.buf = buf;
    info.keynr = active_index;

4915
    lockretryN(read_lock_wait_time){
4916 4917 4918 4919 4920
        error = cursor->c_getf_first(cursor, flags, SMART_DBT_CALLBACK, &info);
        lockretry_wait;
    }
    error = handle_cursor_error(error,HA_ERR_END_OF_FILE,active_index);

4921 4922 4923 4924 4925 4926
    //
    // still need to get entire contents of the row if operation done on
    // secondary DB and it was NOT a covering index
    //
    if (!error && !key_read && (active_index != primary_key) && !(table->key_info[active_index].flags & HA_CLUSTERING) ) {
        error = read_full_row(buf);
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4927
    }
4928 4929 4930
    trx->stmt_progress.queried++;
    track_progress(thd);
    
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4931
cleanup:
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4932
    TOKUDB_DBUG_RETURN(error);
4933 4934
}

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4935 4936 4937 4938 4939 4940 4941 4942 4943
//
// Reads the last row from the active index (cursor) into buf, and advances cursor
// Parameters:
//      [out]   buf - buffer for the next row, in MySQL format
// Returns:
//      0 on success
//      HA_ERR_END_OF_FILE if not found
//      error otherwise
//
4944
int ha_tokudb::index_last(uchar * buf) {
4945
    TOKUDB_DBUG_ENTER("ha_tokudb::index_last");
4946
    int error = 0;
4947
    struct smart_dbt_info info;
4948
    u_int32_t flags = SET_PRELOCK_FLAG(0);
4949 4950
    THD* thd = ha_thd();
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);;
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4951
    HANDLE_INVALID_CURSOR();
4952

4953
    statistic_increment(table->in_use->status_var.ha_read_last_count, &LOCK_status);
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4955 4956 4957 4958
    info.ha = this;
    info.buf = buf;
    info.keynr = active_index;

4959
    lockretryN(read_lock_wait_time){
4960 4961 4962 4963
        error = cursor->c_getf_last(cursor, flags, SMART_DBT_CALLBACK, &info);
        lockretry_wait;
    }
    error = handle_cursor_error(error,HA_ERR_END_OF_FILE,active_index);
4964 4965 4966 4967 4968 4969
    //
    // still need to get entire contents of the row if operation done on
    // secondary DB and it was NOT a covering index
    //
    if (!error && !key_read && (active_index != primary_key) && !(table->key_info[active_index].flags & HA_CLUSTERING) ) {
        error = read_full_row(buf);
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4970
    }
4971 4972 4973 4974 4975

    if (trx) {
        trx->stmt_progress.queried++;
    }
    track_progress(thd);
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4976
cleanup:
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4977
    TOKUDB_DBUG_RETURN(error);
4978 4979
}

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//
// Initialize a scan of the table (which is why index_init is called on primary_key)
// Parameters:
//          scan - unused
// Returns:
//      0 on success
//      error otherwise
//
4988
int ha_tokudb::rnd_init(bool scan) {
4989
    TOKUDB_DBUG_ENTER("ha_tokudb::rnd_init");
4990
    int error = 0;
4991
    read_lock_wait_time = get_read_lock_wait_time(ha_thd());
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4992
    range_lock_grabbed = false;
4993 4994 4995
    error = index_init(primary_key, 0);
    if (error) { goto cleanup;}

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4996 4997
    if (scan) {
        DB* db = share->key_file[primary_key];
4998
        lockretryN(read_lock_wait_time){
4999
            error = cursor->c_pre_acquire_range_lock(cursor, db->dbt_neg_infty(), db->dbt_pos_infty());
5000 5001
            lockretry_wait;
        }
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5002
        if (error) { goto cleanup; }
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5003
    }
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5004
    //
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5005
    // only want to set range_lock_grabbed to true after index_init
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    // successfully executed for two reasons:
    // 1) index_init will reset it to false anyway
    // 2) if it fails, we don't want prelocking on,
    //
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5010
    if (scan) { range_lock_grabbed = true; }
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5011
    error = 0;
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5012
cleanup:
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    if (error) { 
        index_end();
        last_cursor_error = error; 
    }
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5017
    TOKUDB_DBUG_RETURN(error);
5018 5019
}

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//
// End a scan of the table
//
5023
int ha_tokudb::rnd_end() {
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5024
    TOKUDB_DBUG_ENTER("ha_tokudb::rnd_end");
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5025
    range_lock_grabbed = false;
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5026
    TOKUDB_DBUG_RETURN(index_end());
5027 5028
}

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5029

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//
// Read the next row in a table scan
// Parameters:
//      [out]   buf - buffer for the next row, in MySQL format
// Returns:
//      0 on success
//      HA_ERR_END_OF_FILE if not found
//      error otherwise
//
5039
int ha_tokudb::rnd_next(uchar * buf) {
5040
    TOKUDB_DBUG_ENTER("ha_tokudb::ha_tokudb::rnd_next");
5041
    int error = 0;
5042
    u_int32_t flags = SET_PRELOCK_FLAG(0);
5043 5044 5045
    THD* thd = ha_thd();
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);;
    
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5046
    struct smart_dbt_info info;
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5047

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5048
    HANDLE_INVALID_CURSOR();
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5049 5050 5051 5052
    //
    // The reason we do not just call index_next is that index_next 
    // increments a different variable than we do here
    //
5053
    statistic_increment(table->in_use->status_var.ha_read_rnd_next_count, &LOCK_status);
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5054 5055 5056 5057

    info.ha = this;
    info.buf = buf;
    info.keynr = primary_key;
5058

5059
    lockretryN(read_lock_wait_time){
5060 5061 5062 5063
        error = cursor->c_getf_next(cursor, flags, SMART_DBT_CALLBACK, &info);
        lockretry_wait;
    }
    error = handle_cursor_error(error, HA_ERR_END_OF_FILE,primary_key);
5064 5065 5066

    trx->stmt_progress.queried++;
    track_progress(thd);
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5067
cleanup:
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5068
    TOKUDB_DBUG_RETURN(error);
5069 5070 5071
}


5072 5073 5074
void ha_tokudb::track_progress(THD* thd) {
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
    if (trx) {
5075
        ulonglong num_written = trx->stmt_progress.inserted + trx->stmt_progress.updated + trx->stmt_progress.deleted;
5076
        bool update_status = 
5077
            (trx->stmt_progress.queried && tokudb_read_status_frequency && (trx->stmt_progress.queried % tokudb_read_status_frequency) == 0) ||
5078
            (num_written && tokudb_write_status_frequency && (num_written % tokudb_write_status_frequency) == 0);
5079
        if (update_status) {
5080 5081 5082 5083
            char *next_status = write_status_msg;
            bool first = true;
            int r;
            if (trx->stmt_progress.queried) {
5084 5085
                r = sprintf(next_status, "Queried about %llu row%s", trx->stmt_progress.queried, trx->stmt_progress.queried == 1 ? "" : "s"); 
                assert(r >= 0);
5086 5087 5088 5089
                next_status += r;
                first = false;
            }
            if (trx->stmt_progress.inserted) {
5090 5091 5092 5093 5094 5095
                if (trx->stmt_progress.using_loader) {
                    r = sprintf(next_status, "%sFetched about %llu row%s, loading data still remains", first ? "" : ", ", trx->stmt_progress.inserted, trx->stmt_progress.inserted == 1 ? "" : "s"); 
                }
                else {
                    r = sprintf(next_status, "%sInserted about %llu row%s", first ? "" : ", ", trx->stmt_progress.inserted, trx->stmt_progress.inserted == 1 ? "" : "s"); 
                }
5096
                assert(r >= 0);
5097 5098 5099 5100
                next_status += r;
                first = false;
            }
            if (trx->stmt_progress.updated) {
5101 5102
                r = sprintf(next_status, "%sUpdated about %llu row%s", first ? "" : ", ", trx->stmt_progress.updated, trx->stmt_progress.updated == 1 ? "" : "s"); 
                assert(r >= 0);
5103 5104 5105 5106
                next_status += r;
                first = false;
            }
            if (trx->stmt_progress.deleted) {
5107 5108
                r = sprintf(next_status, "%sDeleted about %llu row%s", first ? "" : ", ", trx->stmt_progress.deleted, trx->stmt_progress.deleted == 1 ? "" : "s"); 
                assert(r >= 0);
5109 5110 5111
                next_status += r;
                first = false;
            }
5112 5113
            if (!first)
	        thd_proc_info(thd, write_status_msg);
5114 5115 5116 5117 5118
        }
    }
}


5119
DBT *ha_tokudb::get_pos(DBT * to, uchar * pos) {
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5120
    TOKUDB_DBUG_ENTER("ha_tokudb::get_pos");
5121 5122
    /* We don't need to set app_data here */
    bzero((void *) to, sizeof(*to));
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5123 5124
    to->data = pos + sizeof(u_int32_t);
    to->size = *(u_int32_t *)pos;
5125
    DBUG_DUMP("key", (const uchar *) to->data, to->size);
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5126
    DBUG_RETURN(to);
5127 5128
}

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5129
//
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5130
// Retrieves a row with based on the primary key saved in pos
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// Returns:
//      0 on success
//      HA_ERR_KEY_NOT_FOUND if not found
//      error otherwise
//
5136
int ha_tokudb::rnd_pos(uchar * buf, uchar * pos) {
5137
    TOKUDB_DBUG_ENTER("ha_tokudb::rnd_pos");
5138
    DBT db_pos;
5139
    int error = 0;
5140 5141 5142
    struct smart_dbt_info info;
    bool old_unpack_entire_row = unpack_entire_row;
    DBT* key = get_pos(&db_pos, pos); 
5143
    read_lock_wait_time = get_read_lock_wait_time(ha_thd());
5144 5145

    unpack_entire_row = true;
5146 5147
    statistic_increment(table->in_use->status_var.ha_read_rnd_count, &LOCK_status);
    active_index = MAX_KEY;
5148 5149 5150 5151 5152

    info.ha = this;
    info.buf = buf;
    info.keynr = primary_key;

5153
    lockretryN(read_lock_wait_time) {
5154
        error = share->file->getf_set(share->file, transaction, get_cursor_isolation_flags(lock.type, ha_thd()), key, smart_dbt_callback_rowread_ptquery, &info);
5155 5156 5157
        lockretry_wait;
    }

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5158
    if (error == DB_NOTFOUND) {
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        error = HA_ERR_KEY_NOT_FOUND;
        goto cleanup;
    }
cleanup:
5163
    unpack_entire_row = old_unpack_entire_row;
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5164
    TOKUDB_DBUG_RETURN(error);
5165 5166
}

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5167
int ha_tokudb::prelock_range( const key_range *start_key, const key_range *end_key) {
5168
    TOKUDB_DBUG_ENTER("ha_tokudb::prelock_range");
5169 5170

    int error = 0;
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5171 5172
    DBT start_dbt_key;
    DBT end_dbt_key;
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    uchar* start_key_buff  = key_buff2;
    uchar* end_key_buff = key_buff3;
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5175

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5176 5177 5178
    bzero((void *) &start_dbt_key, sizeof(start_dbt_key));
    bzero((void *) &end_dbt_key, sizeof(end_dbt_key));

5179
    HANDLE_INVALID_CURSOR();
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5180 5181 5182
    if (start_key) {
        switch (start_key->flag) {
        case HA_READ_AFTER_KEY:
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5183
            pack_key(&start_dbt_key, active_index, start_key_buff, start_key->key, start_key->length, COL_POS_INF);
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            break;
        default:
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5186
            pack_key(&start_dbt_key, active_index, start_key_buff, start_key->key, start_key->length, COL_NEG_INF);
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            break;
        }
    }
5190

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    if (end_key) {
        switch (end_key->flag) {
        case HA_READ_BEFORE_KEY:
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5194
            pack_key(&end_dbt_key, active_index, end_key_buff, end_key->key, end_key->length, COL_NEG_INF);
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            break;
        default:
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5197
            pack_key(&end_dbt_key, active_index, end_key_buff, end_key->key, end_key->length, COL_POS_INF);
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5198
            break;
5199
        }        
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5200 5201
    }

5202
    lockretryN(read_lock_wait_time){
5203 5204 5205 5206 5207
        error = cursor->c_pre_acquire_range_lock(
                    cursor, 
                    start_key ? &start_dbt_key : share->key_file[active_index]->dbt_neg_infty(), 
                    end_key ? &end_dbt_key : share->key_file[active_index]->dbt_pos_infty()
                    );
5208 5209
        lockretry_wait;
    }
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5210 5211 5212 5213 5214 5215
    if (error){ 
        last_cursor_error = error;
        //
        // cursor should be initialized here, but in case it is not, we still check
        //
        if (cursor) {
5216 5217
            int r = cursor->c_close(cursor);
            assert(r==0);
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5218 5219 5220 5221
            cursor = NULL;
        }
        goto cleanup; 
    }
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5222 5223 5224

cleanup:
    TOKUDB_DBUG_RETURN(error);
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Zardosht Kasheff committed
5225
}
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5226

5227 5228 5229 5230 5231 5232
//
// Prelock range if possible, start_key is leftmost, end_key is rightmost
// whether scanning forward or backward.  This function is called by MySQL
// for backward range queries (in QUICK_SELECT_DESC::get_next). 
// Forward scans use read_range_first()/read_range_next().
//
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5233
int ha_tokudb::prepare_range_scan( const key_range *start_key, const key_range *end_key) {
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5234 5235 5236 5237 5238
    int error = prelock_range(start_key, end_key);
    if (!error) {
        range_lock_grabbed = true;
    }
    return error;
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5239 5240 5241 5242 5243 5244 5245 5246
}

int ha_tokudb::read_range_first(
    const key_range *start_key,
    const key_range *end_key,
    bool eq_range, 
    bool sorted) 
{
5247
    int error = prelock_range(start_key, end_key);
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5248 5249 5250 5251 5252 5253 5254
    if (error) { goto cleanup; }
    range_lock_grabbed = true;
    
    error = handler::read_range_first(start_key, end_key, eq_range, sorted);
cleanup:
    return error;
}
5255

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5256 5257
int ha_tokudb::read_range_next()
{
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5258 5259 5260 5261
    TOKUDB_DBUG_ENTER("ha_tokudb::read_range_next");
    int error;
    error = handler::read_range_next();
    if (error) {
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5262
        range_lock_grabbed = false;
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5263 5264
    }
    TOKUDB_DBUG_RETURN(error);
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}



5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289
/*
  Set a reference to the current record in (ref,ref_length).

  SYNOPSIS
  ha_tokudb::position()
  record                      The current record buffer

  DESCRIPTION
  The BDB handler stores the primary key in (ref,ref_length).
  There is either an explicit primary key, or an implicit (hidden)
  primary key.
  During open(), 'ref_length' is calculated as the maximum primary
  key length. When an actual key is shorter than that, the rest of
  the buffer must be cleared out. The row cannot be identified, if
  garbage follows behind the end of the key. There is no length
  field for the current key, so that the whole ref_length is used
  for comparison.

  RETURN
  nothing
*/
5290
void ha_tokudb::position(const uchar * record) {
5291
    TOKUDB_DBUG_ENTER("ha_tokudb::position");
5292 5293
    DBT key;
    if (hidden_primary_key) {
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5294 5295
        DBUG_ASSERT(ref_length == (TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH + sizeof(u_int32_t)));
        memcpy_fixed(ref + sizeof(u_int32_t), current_ident, TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH);
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5296
        *(u_int32_t *)ref = TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH;
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5297 5298
    } 
    else {
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5299 5300 5301 5302 5303 5304 5305 5306 5307
        bool has_null;
        //
        // save the data
        //
        create_dbt_key_from_table(&key, primary_key, ref + sizeof(u_int32_t), record, &has_null);
        //
        // save the size of data in the first four bytes of ref
        //
        memcpy(ref, &key.size, sizeof(u_int32_t));
5308 5309 5310 5311
    }
    DBUG_VOID_RETURN;
}

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5312 5313 5314 5315 5316 5317
//
// Per InnoDB: Returns statistics information of the table to the MySQL interpreter,
// in various fields of the handle object. 
// Return:
//      0, always success
//
5318
int ha_tokudb::info(uint flag) {
5319
    TOKUDB_DBUG_ENTER("ha_tokudb::info %p %d %lld", this, flag, (long long) share->rows);
5320 5321 5322 5323
    int error;
    DB_TXN* txn = NULL;
    uint curr_num_DBs = table->s->keys + test(hidden_primary_key);
    DB_BTREE_STAT64 dict_stats;
5324 5325
    if (flag & HA_STATUS_VARIABLE) {
        // Just to get optimizations right
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5326
        stats.records = share->rows + share->rows_from_locked_table;
5327 5328 5329
        if (stats.records == 0) {
            stats.records++;
        }
5330
        stats.deleted = 0;
5331
        if (!(flag & HA_STATUS_NO_LOCK)) {
5332
            u_int64_t num_rows = 0;
5333 5334
            TOKU_DB_FRAGMENTATION_S frag_info;
            memset(&frag_info, 0, sizeof frag_info);
5335

5336 5337 5338
            error = db_env->txn_begin(db_env, NULL, &txn, DB_READ_UNCOMMITTED);
            if (error) { goto cleanup; }

5339 5340 5341 5342
            error = estimate_num_rows(share->file,&num_rows, txn);
            if (error == 0) {
                share->rows = num_rows;
                stats.records = num_rows;
5343 5344 5345
                if (stats.records == 0) {
                    stats.records++;
                }
5346 5347 5348 5349
            }
            else {
                goto cleanup;
            }
5350 5351 5352 5353 5354 5355
            error = share->file->get_fragmentation(
                share->file,
                &frag_info
                );
            if (error) { goto cleanup; }
            stats.delete_length = frag_info.unused_bytes;
5356

5357 5358 5359 5360 5361 5362
            error = share->file->stat64(
                share->file, 
                txn, 
                &dict_stats
                );
            if (error) { goto cleanup; }
5363
            
5364
            stats.data_file_length = dict_stats.bt_dsize;
5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380
            if (hidden_primary_key) {
                //
                // in this case, we have a hidden primary key, do not
                // want to report space taken up by the hidden primary key to the user
                //
                u_int64_t hpk_space = TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH*dict_stats.bt_ndata;
                stats.data_file_length = (hpk_space > stats.data_file_length) ? 0 : stats.data_file_length - hpk_space;
            }
            else {
                //
                // one infinity byte per key needs to be subtracted
                //
                u_int64_t inf_byte_space = dict_stats.bt_ndata;
                stats.data_file_length = (inf_byte_space > stats.data_file_length) ? 0 : stats.data_file_length - inf_byte_space;
            }

5381
            stats.mean_rec_length = stats.records ? (ulong)(stats.data_file_length/stats.records) : 0;
5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393
            stats.index_file_length = 0;
            for (uint i = 0; i < curr_num_DBs; i++) {
                if (i == primary_key) {
                    continue;
                }
                error = share->key_file[i]->stat64(
                    share->key_file[i], 
                    txn, 
                    &dict_stats
                    );
                if (error) { goto cleanup; }
                stats.index_file_length += dict_stats.bt_dsize;
5394 5395 5396 5397 5398 5399 5400

                error = share->file->get_fragmentation(
                    share->file,
                    &frag_info
                    );
                if (error) { goto cleanup; }
                stats.delete_length += frag_info.unused_bytes;
5401 5402
            }
        }
5403
    }
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5404
    if ((flag & HA_STATUS_CONST)) {
5405
        stats.max_data_file_length=  9223372036854775807ULL;
5406
        for (uint i = 0; i < table_share->keys; i++) {
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5407
            table->key_info[i].rec_per_key[table->key_info[i].key_parts - 1] = 0;
5408 5409 5410
        }
    }
    /* Don't return key if we got an error for the internal primary key */
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5411
    if (flag & HA_STATUS_ERRKEY && last_dup_key < table_share->keys) {
5412
        errkey = last_dup_key;
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5413
    }    
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5414
    if (flag & HA_STATUS_AUTO && table->found_next_number_field) {        
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5415 5416
        THD *thd= table->in_use;
        struct system_variables *variables= &thd->variables;
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        stats.auto_increment_value = share->last_auto_increment + variables->auto_increment_increment;
    }
5419 5420 5421
    error = 0;
cleanup:
    if (txn != NULL) {
5422
        commit_txn(txn, DB_TXN_NOSYNC);
5423 5424 5425
        txn = NULL;
    }
    TOKUDB_DBUG_RETURN(error);
5426 5427
}

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5428 5429 5430
//
//  Per InnoDB: Tells something additional to the handler about how to do things.
//
5431
int ha_tokudb::extra(enum ha_extra_function operation) {
5432
    TOKUDB_DBUG_ENTER("extra %p %d", this, operation);
5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451
    switch (operation) {
    case HA_EXTRA_RESET_STATE:
        reset();
        break;
    case HA_EXTRA_KEYREAD:
        key_read = 1;           // Query satisfied with key
        break;
    case HA_EXTRA_NO_KEYREAD:
        key_read = 0;
        break;
    case HA_EXTRA_IGNORE_DUP_KEY:
        using_ignore = 1;
        break;
    case HA_EXTRA_NO_IGNORE_DUP_KEY:
        using_ignore = 0;
        break;
    default:
        break;
    }
5452
    TOKUDB_DBUG_RETURN(0);
5453 5454 5455
}

int ha_tokudb::reset(void) {
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5456
    TOKUDB_DBUG_ENTER("ha_tokudb::reset");
5457 5458
    key_read = 0;
    using_ignore = 0;
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5459
    TOKUDB_DBUG_RETURN(0);
5460 5461
}

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//
// helper function that iterates through all DB's 
// and grabs a lock (either read or write, but not both)
// Parameters:
//      [in]    trans - transaction to be used to pre acquire the lock
//              lt - type of lock to get, either lock_read or lock_write
//  Returns:
//      0 on success
//      error otherwise
//
int ha_tokudb::acquire_table_lock (DB_TXN* trans, TABLE_LOCK_TYPE lt) {
    int error = ENOSYS;
5475 5476
    rw_rdlock(&share->num_DBs_lock);
    uint curr_num_DBs = share->num_DBs;
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    if (lt == lock_read) {
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        error = 0;
        goto cleanup;
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    }
    else if (lt == lock_write) {
5482 5483
        if (tokudb_debug & TOKUDB_DEBUG_LOCK)
            TOKUDB_TRACE("%s\n", __FUNCTION__);
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        for (uint i = 0; i < curr_num_DBs; i++) {
            DB* db = share->key_file[i];
            error = db->pre_acquire_table_lock(db, trans);
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            if (error == EINVAL) 
                TOKUDB_TRACE("%s %d db=%p trans=%p\n", __FUNCTION__, i, db, trans);
            if (error) break;
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        }
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        if (tokudb_debug & TOKUDB_DEBUG_LOCK)
            TOKUDB_TRACE("%s error=%d\n", __FUNCTION__, error);
        if (error) goto cleanup;
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    }
    else {
        error = ENOSYS;
        goto cleanup;
    }

    error = 0;
cleanup:
5502
    rw_unlock(&share->num_DBs_lock);
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    return error;
}


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int ha_tokudb::create_txn(THD* thd, tokudb_trx_data* trx) {
    int error;
    ulong tx_isolation = thd_tx_isolation(thd);
    HA_TOKU_ISO_LEVEL toku_iso_level = tx_to_toku_iso(tx_isolation);

    /* First table lock, start transaction */
5513
    if (thd_test_options(thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) && 
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         !trx->all &&
         (thd_sql_command(thd) != SQLCOM_CREATE_TABLE) &&
         (thd_sql_command(thd) != SQLCOM_DROP_TABLE) &&
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         (thd_sql_command(thd) != SQLCOM_DROP_INDEX) &&
         (thd_sql_command(thd) != SQLCOM_CREATE_INDEX) &&
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         (thd_sql_command(thd) != SQLCOM_ALTER_TABLE)) {
        /* QQQ We have to start a master transaction */
5521
        // DBUG_PRINT("trans", ("starting transaction all "));
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        if ((error = db_env->txn_begin(db_env, NULL, &trx->all, toku_iso_to_txn_flag(toku_iso_level)))) {
            trx->tokudb_lock_count--;      // We didn't get the lock
            goto cleanup;
        }
        if (tokudb_debug & TOKUDB_DEBUG_TXN) {
5527
            TOKUDB_TRACE("just created master:%p\n", trx->all);
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        }
        trx->sp_level = trx->all;
        trans_register_ha(thd, TRUE, tokudb_hton);
    }
    DBUG_PRINT("trans", ("starting transaction stmt"));
    if (trx->stmt) { 
        if (tokudb_debug & TOKUDB_DEBUG_TXN) {
            TOKUDB_TRACE("warning:stmt=%p\n", trx->stmt);
        }
    }
    u_int32_t txn_begin_flags;
5539
    if (trx->all == NULL) {
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        txn_begin_flags = toku_iso_to_txn_flag(toku_iso_level);
    }
    else {
5543
        txn_begin_flags = DB_INHERIT_ISOLATION;
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    }
    if ((error = db_env->txn_begin(db_env, trx->sp_level, &trx->stmt, txn_begin_flags))) {
        /* We leave the possible master transaction open */
        trx->tokudb_lock_count--;  // We didn't get the lock
        goto cleanup;
    }
5550
    trx->sub_sp_level = trx->stmt;
5551
    if (tokudb_debug & TOKUDB_DEBUG_TXN) {
5552
        TOKUDB_TRACE("just created stmt:%p:%p\n", trx->sp_level, trx->stmt);
5553
    }
5554
    reset_stmt_progress(&trx->stmt_progress);
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    trans_register_ha(thd, FALSE, tokudb_hton);
cleanup:
    return error;
}

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/*
  As MySQL will execute an external lock for every new table it uses
  we can use this to start the transactions.
  If we are in auto_commit mode we just need to start a transaction
  for the statement to be able to rollback the statement.
  If not, we have to start a master transaction if there doesn't exist
  one from before.
*/
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//
// Parameters:
//      [in]    thd - handle to the user thread
//              lock_type - the type of lock
// Returns:
//      0 on success
//      error otherwise
//
5577
int ha_tokudb::external_lock(THD * thd, int lock_type) {
5578 5579 5580
    TOKUDB_DBUG_ENTER("ha_tokudb::external_lock cmd=%d %d", thd_sql_command(thd), lock_type);
    if (tokudb_debug & TOKUDB_DEBUG_LOCK)
        TOKUDB_TRACE("%s cmd=%d %d\n", __FUNCTION__, thd_sql_command(thd), lock_type);
5581

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    int error = 0;
    tokudb_trx_data *trx = NULL;
    trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
5585
    if (!trx) {
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        error = create_tokudb_trx_data_instance(&trx);
        if (error) { goto cleanup; }
5588
        thd_data_set(thd, tokudb_hton->slot, trx);
5589
    }
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    if (trx->all == NULL) {
        trx->sp_level = NULL;
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    }
5593
    if (lock_type != F_UNLCK) {
5594
        is_fast_alter_running = false;
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        use_write_locks = false;
        if (get_tokudb_use_write_locks(thd) && lock_type == F_WRLCK)
            use_write_locks = true;
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        if (!trx->tokudb_lock_count++) {
            DBUG_ASSERT(trx->stmt == 0);
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            transaction = NULL;    // Safety
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            error = create_txn(thd, trx);
            if (error) {
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                goto cleanup;
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            }
        }
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        assert(thd->in_sub_stmt == 0);
        transaction = trx->sub_sp_level;
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    }
    else {
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        pthread_mutex_lock(&share->mutex);
        // hate dealing with comparison of signed vs unsigned, so doing this
        if (deleted_rows > added_rows && share->rows < (deleted_rows - added_rows)) {
            share->rows = 0;
        }
        else {
            share->rows += (added_rows - deleted_rows);
        }
        pthread_mutex_unlock(&share->mutex);
        added_rows = 0;
        deleted_rows = 0;
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        share->rows_from_locked_table = 0;
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        if (!--trx->tokudb_lock_count) {
            if (trx->stmt) {
                /*
                   F_UNLCK is done without a transaction commit / rollback.
                   This happens if the thread didn't update any rows
                   We must in this case commit the work to keep the row locks
                 */
                DBUG_PRINT("trans", ("commiting non-updating transaction"));
5630
                reset_stmt_progress(&trx->stmt_progress);
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                if (!is_fast_alter_running) {
                    commit_txn(trx->stmt, 0);
                    if (tokudb_debug & TOKUDB_DEBUG_TXN) {
                        TOKUDB_TRACE("commit:%p:%d\n", trx->stmt, error);
                    }
                    trx->stmt = NULL;
                    trx->sub_sp_level = NULL;
                }
5639 5640
            }
        }
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        transaction = NULL;
5642
        is_fast_alter_running = false;
5643
    }
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cleanup:
5645 5646
    if (tokudb_debug & TOKUDB_DEBUG_LOCK)
        TOKUDB_TRACE("%s error=%d\n", __FUNCTION__, error);
5647
    TOKUDB_DBUG_RETURN(error);
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}


/*
  When using LOCK TABLE's external_lock is only called when the actual
  TABLE LOCK is done.
  Under LOCK TABLES, each used tables will force a call to start_stmt.
*/

5657
int ha_tokudb::start_stmt(THD * thd, thr_lock_type lock_type) {
5658
    TOKUDB_DBUG_ENTER("ha_tokudb::start_stmt cmd=%d %d", thd_sql_command(thd), lock_type);
5659
    int error = 0;
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5662
    tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
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    DBUG_ASSERT(trx);
    /*
       note that trx->stmt may have been already initialized as start_stmt()
       is called for *each table* not for each storage engine,
       and there could be many bdb tables referenced in the query
     */
    if (!trx->stmt) {
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        error = create_txn(thd, trx);
        if (error) {
            goto cleanup;
        }
5674
    }
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    else {
        if (tokudb_debug & TOKUDB_DEBUG_TXN) {
            TOKUDB_TRACE("trx->stmt already existed\n");
        }
    }
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    //
    // we know we are in lock tables
    // attempt to grab a table lock
    // if fail, continue, do not return error
    // This is because a failure ok, it simply means
    // another active transaction has some locks.
    // That other transaction modify this table
    // until it is unlocked, therefore having acquire_table_lock
    // potentially grab some locks but not all is ok.
    //
    if (lock.type <= TL_READ_NO_INSERT) {
5691
        acquire_table_lock(trx->sub_sp_level,lock_read);
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    }
    else {
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        if (!(thd_sql_command(thd) == SQLCOM_CREATE_INDEX ||
            thd_sql_command(thd) == SQLCOM_ALTER_TABLE ||
            thd_sql_command(thd) == SQLCOM_DROP_INDEX ||
            thd_sql_command(thd) == SQLCOM_TRUNCATE)) {
            acquire_table_lock(trx->sub_sp_level,lock_write);
        }
5700
    }    
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    if (added_rows > deleted_rows) {
        share->rows_from_locked_table = added_rows - deleted_rows;
    }
5704 5705
    transaction = trx->sub_sp_level;
    trans_register_ha(thd, FALSE, tokudb_hton);
5706
cleanup:
5707
    TOKUDB_DBUG_RETURN(error);
5708 5709
}

5710 5711 5712 5713 5714

u_int32_t ha_tokudb::get_cursor_isolation_flags(enum thr_lock_type lock_type, THD* thd) {
    uint sql_command = thd_sql_command(thd);
    bool in_lock_tables = thd_in_lock_tables(thd);

5715 5716 5717 5718 5719 5720 5721
    //
    // following InnoDB's lead and having checksum command use a snapshot read if told
    //
    if (sql_command == SQLCOM_CHECKSUM) {
        return 0;
    }
    else if ((lock_type == TL_READ && in_lock_tables) || 
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             (lock_type == TL_READ_HIGH_PRIORITY && in_lock_tables) || 
             sql_command != SQLCOM_SELECT ||
             (sql_command == SQLCOM_SELECT && lock_type >= TL_WRITE_ALLOW_WRITE)) { // select for update 
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        return DB_SERIALIZABLE;
    }
    else {
        return 0;
    }
}

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/*
  The idea with handler::store_lock() is the following:

  The statement decided which locks we should need for the table
  for updates/deletes/inserts we get WRITE locks, for SELECT... we get
  read locks.

  Before adding the lock into the table lock handler (see thr_lock.c)
  mysqld calls store lock with the requested locks.  Store lock can now
  modify a write lock to a read lock (or some other lock), ignore the
  lock (if we don't want to use MySQL table locks at all) or add locks
  for many tables (like we do when we are using a MERGE handler).

  Tokudb DB changes all WRITE locks to TL_WRITE_ALLOW_WRITE (which
  signals that we are doing WRITES, but we are still allowing other
  reader's and writer's.

  When releasing locks, store_lock() are also called. In this case one
  usually doesn't have to do anything.

  In some exceptional cases MySQL may send a request for a TL_IGNORE;
  This means that we are requesting the same lock as last time and this
  should also be ignored. (This may happen when someone does a flush
  table when we have opened a part of the tables, in which case mysqld
  closes and reopens the tables and tries to get the same locks at last
  time).  In the future we will probably try to remove this.
*/

5760
THR_LOCK_DATA **ha_tokudb::store_lock(THD * thd, THR_LOCK_DATA ** to, enum thr_lock_type lock_type) {
5761
    TOKUDB_DBUG_ENTER("ha_tokudb::store_lock, lock_type=%d cmd=%d", lock_type, thd_sql_command(thd));
5762
    if (tokudb_debug & TOKUDB_DEBUG_LOCK) {
5763
        TOKUDB_TRACE("%s lock_type=%d cmd=%d\n", __FUNCTION__, lock_type, thd_sql_command(thd));
5764
    }
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    if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK) {
        // if creating a hot index
        if (get_create_index_online(thd) && thd_sql_command(thd)== SQLCOM_CREATE_INDEX) {
            rw_rdlock(&share->num_DBs_lock);
            if (share->num_DBs == (table->s->keys + test(hidden_primary_key))) {
                lock_type = TL_WRITE_ALLOW_WRITE;
            }
            lock.type = lock_type;
            rw_unlock(&share->num_DBs_lock);
        } else {
            // If we are not doing a LOCK TABLE, then allow multiple writers
            if ((lock_type >= TL_WRITE_CONCURRENT_INSERT && lock_type <= TL_WRITE) && 
                !thd->in_lock_tables && thd_sql_command(thd) != SQLCOM_TRUNCATE && !thd_tablespace_op(thd)) {
                lock_type = TL_WRITE_ALLOW_WRITE;
            }
            lock.type = lock_type;
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        }
5783
    }
5784
    *to++ = &lock;
5785 5786
    if (tokudb_debug & TOKUDB_DEBUG_LOCK)
        TOKUDB_TRACE("%s lock_type=%d\n", __FUNCTION__, lock_type);
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    DBUG_RETURN(to);
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}

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int toku_dbt_up(DB*,
                                 u_int32_t old_version, const DBT *old_descriptor, const DBT *old_key, const DBT *old_val,
                                 u_int32_t new_version, const DBT *new_descriptor, const DBT *new_key, const DBT *new_val) {
    assert(false);
    return 0;
}

5797
static int create_sub_table(const char *table_name, DBT* row_descriptor, DB_TXN* txn, uint32_t block_size, bool is_hot_index) {
5798
    TOKUDB_DBUG_ENTER("create_sub_table");
5799
    int error;
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    DB *file = NULL;
5801
    u_int32_t create_flags;
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5802
    
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    error = db_create(&file, db_env, 0);
    if (error) {
        DBUG_PRINT("error", ("Got error: %d when creating table", error));
        my_errno = error;
        goto exit;
    }
        
5811

5812 5813
    if (block_size != 0) {
        error = file->set_pagesize(file, block_size);
5814
        if (error != 0) {
5815
            DBUG_PRINT("error", ("Got error: %d when setting block size %u for table '%s'", error, block_size, table_name));
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            goto exit;
        }
    }
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    create_flags = DB_THREAD | DB_CREATE | DB_EXCL | (is_hot_index ? DB_IS_HOT_INDEX : 0);    
    error = file->open(file, txn, table_name, NULL, DB_BTREE, create_flags, my_umask);
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    if (error) {
        DBUG_PRINT("error", ("Got error: %d when opening table '%s'", error, table_name));
        goto exit;
    } 
5826

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    error = file->change_descriptor(file, txn, row_descriptor, (is_hot_index ? DB_IS_HOT_INDEX : 0));
    if (error) {
        DBUG_PRINT("error", ("Got error: %d when setting row descriptor for table '%s'", error, table_name));
        goto exit;
    }

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    error = 0;
exit:
5835
    if (file) {
5836 5837
        int r = file->close(file, 0);
        assert(r==0);
5838
    }
5839
    TOKUDB_DBUG_RETURN(error);
5840 5841
}

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void ha_tokudb::update_create_info(HA_CREATE_INFO* create_info) {
    if (share->has_auto_inc) {
        info(HA_STATUS_AUTO);
        create_info->auto_increment_value = stats.auto_increment_value;
    }
}

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//
5850 5851 5852 5853
// removes key name from status.tokudb.
// needed for when we are dropping indexes, so that 
// during drop table, we do not attempt to remove already dropped
// indexes because we did not keep status.tokudb in sync with list of indexes.
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//
5855
int ha_tokudb::remove_key_name_from_status(DB* status_block, char* key_name, DB_TXN* txn) {
5856
    int error;
5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875
    uchar status_key_info[FN_REFLEN + sizeof(HA_METADATA_KEY)];
    HA_METADATA_KEY md_key = hatoku_key_name;
    memcpy(status_key_info, &md_key, sizeof(HA_METADATA_KEY));
    //
    // put index name in status.tokudb
    // 
    memcpy(
        status_key_info + sizeof(HA_METADATA_KEY), 
        key_name, 
        strlen(key_name) + 1
        );
    error = remove_metadata(
        status_block,
        status_key_info,
        sizeof(HA_METADATA_KEY) + strlen(key_name) + 1,
        txn
        );
    return error;
}
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//
// writes the key name in status.tokudb, so that we may later delete or rename
// the dictionary associated with key_name
//
int ha_tokudb::write_key_name_to_status(DB* status_block, char* key_name, DB_TXN* txn) {
    int error;
    uchar status_key_info[FN_REFLEN + sizeof(HA_METADATA_KEY)];
    HA_METADATA_KEY md_key = hatoku_key_name;
    memcpy(status_key_info, &md_key, sizeof(HA_METADATA_KEY));
    //
    // put index name in status.tokudb
    // 
    memcpy(
        status_key_info + sizeof(HA_METADATA_KEY), 
        key_name, 
        strlen(key_name) + 1
        );
    error = write_metadata(
        status_block,
        status_key_info,
        sizeof(HA_METADATA_KEY) + strlen(key_name) + 1,
        NULL,
        0,
        txn
        );
    return error;
}
5904

5905 5906 5907 5908 5909
//
// some tracing moved out of ha_tokudb::create, because ::create was getting cluttered
//
void ha_tokudb::trace_create_table_info(const char *name, TABLE * form) {
    uint i;
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    //
    // tracing information about what type of table we are creating
    //
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    if (tokudb_debug & TOKUDB_DEBUG_OPEN) {
        for (i = 0; i < form->s->fields; i++) {
            Field *field = form->s->field[i];
            TOKUDB_TRACE("field:%d:%s:type=%d:flags=%x\n", i, field->field_name, field->type(), field->flags);
        }
        for (i = 0; i < form->s->keys; i++) {
            KEY *key = &form->s->key_info[i];
            TOKUDB_TRACE("key:%d:%s:%d\n", i, key->name, key->key_parts);
            uint p;
            for (p = 0; p < key->key_parts; p++) {
                KEY_PART_INFO *key_part = &key->key_part[p];
                Field *field = key_part->field;
                TOKUDB_TRACE("key:%d:%d:length=%d:%s:type=%d:flags=%x\n",
                             i, p, key_part->length, field->field_name, field->type(), field->flags);
            }
        }
    }
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}

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u_int32_t get_max_desc_size(KEY_AND_COL_INFO* kc_info, TABLE* form) {
    u_int32_t max_row_desc_buff_size;
    max_row_desc_buff_size = 2*(form->s->fields * 6)+10; // upper bound of key comparison descriptor
    max_row_desc_buff_size += get_max_secondary_key_pack_desc_size(kc_info); // upper bound for sec. key part
    max_row_desc_buff_size += get_max_clustering_val_pack_desc_size(form->s); // upper bound for clustering val part
    return max_row_desc_buff_size;
}

u_int32_t create_secondary_key_descriptor(
    uchar* buf,
    KEY* key_info,
    KEY* prim_key,
    uint hpk,
    TABLE* form,
    uint primary_key,
    u_int32_t keynr,
    KEY_AND_COL_INFO* kc_info    
    ) 
{
    uchar* ptr = NULL;

    ptr = buf;
    ptr += create_toku_key_descriptor(
        ptr,
        false,
        key_info,
        hpk,
        prim_key
        );

    ptr += create_toku_secondary_key_pack_descriptor(
        ptr,
        hpk,
        primary_key,
        form->s,
        form,
        kc_info,
        key_info,
        prim_key
        );

    ptr += create_toku_clustering_val_pack_descriptor(
        ptr,
        primary_key,
        form->s,
        kc_info,
        keynr,
        key_info->flags & HA_CLUSTERING
        );
    return ptr - buf;
}


5985 5986 5987
//
// creates dictionary for secondary index, with key description key_info, all using txn
//
5988 5989 5990 5991 5992 5993 5994 5995 5996
int ha_tokudb::create_secondary_dictionary(
    const char* name, TABLE* form, 
    KEY* key_info, 
    DB_TXN* txn, 
    KEY_AND_COL_INFO* kc_info, 
    u_int32_t keynr,
    bool is_hot_index
    ) 
{
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    int error;
    DBT row_descriptor;
    uchar* row_desc_buff = NULL;
    char* newname = NULL;
    KEY* prim_key = NULL;
    char dict_name[MAX_DICT_NAME_LEN];
6003
    u_int32_t max_row_desc_buff_size;
6004
    uint hpk= (form->s->primary_key >= MAX_KEY) ? TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH : 0;
6005
    uint32_t block_size;
6006

6007
    bzero(&row_descriptor, sizeof(row_descriptor));
6008
    
6009
    max_row_desc_buff_size = get_max_desc_size(kc_info,form);
6010 6011

    row_desc_buff = (uchar *)my_malloc(max_row_desc_buff_size, MYF(MY_WME));
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    if (row_desc_buff == NULL){ error = ENOMEM; goto cleanup;}

    newname = (char *)my_malloc(get_max_dict_name_path_length(name),MYF(MY_WME));
    if (newname == NULL){ error = ENOMEM; goto cleanup;}

    sprintf(dict_name, "key-%s", key_info->name);
    make_name(newname, name, dict_name);

    prim_key = (hpk) ? NULL : &form->s->key_info[primary_key];

    //
    // setup the row descriptor
    //
    row_descriptor.data = row_desc_buff;
6026 6027 6028
    //
    // save data necessary for key comparisons
    //
6029
    row_descriptor.size = create_secondary_key_descriptor(
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        row_desc_buff,
        key_info,
6032
        prim_key,
6033
        hpk,
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        form,
        primary_key,
        keynr,
6037
        kc_info    
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        );
    assert(row_descriptor.size <= max_row_desc_buff_size);

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    block_size = key_info->block_size << 10;
    if (block_size == 0) {
        THD* thd = ha_thd();
        block_size = get_tokudb_block_size(thd);
    }

6047
    error = create_sub_table(newname, &row_descriptor, txn, block_size, is_hot_index);
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cleanup:    
    my_free(newname, MYF(MY_ALLOW_ZERO_PTR));
    my_free(row_desc_buff, MYF(MY_ALLOW_ZERO_PTR));
    return error;
}

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u_int32_t create_main_key_descriptor(
    uchar* buf,
    KEY* prim_key,
    uint hpk,
    uint primary_key,
    TABLE* form,
    KEY_AND_COL_INFO* kc_info
    ) 
{
    uchar* ptr = buf;
    ptr += create_toku_key_descriptor(
        ptr, 
        hpk,
        prim_key,
        false,
        NULL
        );
    
    ptr += create_toku_main_key_pack_descriptor(
        ptr
        );

    ptr += create_toku_clustering_val_pack_descriptor(
        ptr,
        primary_key,
        form->s,
        kc_info,
        primary_key,
        false
        );
    return ptr - buf;
}

6088 6089 6090 6091
//
// create and close the main dictionarr with name of "name" using table form, all within
// transaction txn.
//
6092
int ha_tokudb::create_main_dictionary(const char* name, TABLE* form, DB_TXN* txn, KEY_AND_COL_INFO* kc_info) {
6093 6094 6095 6096 6097
    int error;
    DBT row_descriptor;
    uchar* row_desc_buff = NULL;
    char* newname = NULL;
    KEY* prim_key = NULL;
6098
    u_int32_t max_row_desc_buff_size;
6099
    uint hpk= (form->s->primary_key >= MAX_KEY) ? TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH : 0;
6100
    uint32_t block_size;
6101 6102

    bzero(&row_descriptor, sizeof(row_descriptor));
6103
    max_row_desc_buff_size = get_max_desc_size(kc_info, form);
6104 6105

    row_desc_buff = (uchar *)my_malloc(max_row_desc_buff_size, MYF(MY_WME));
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    if (row_desc_buff == NULL){ error = ENOMEM; goto cleanup;}

    newname = (char *)my_malloc(get_max_dict_name_path_length(name),MYF(MY_WME));
    if (newname == NULL){ error = ENOMEM; goto cleanup;}
6110

6111
    make_name(newname, name, "main");
6112 6113

    prim_key = (hpk) ? NULL : &form->s->key_info[primary_key];
6114

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    //
    // setup the row descriptor
    //
    row_descriptor.data = row_desc_buff;
6119 6120 6121
    //
    // save data necessary for key comparisons
    //
6122 6123
    row_descriptor.size = create_main_key_descriptor(
        row_desc_buff,
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6124
        prim_key,
6125
        hpk,
6126
        primary_key,
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        form,
        kc_info
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        );
    assert(row_descriptor.size <= max_row_desc_buff_size);
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6132 6133 6134 6135 6136 6137 6138 6139
    block_size = 0;
    if (prim_key)
        block_size = prim_key->block_size << 10;
    if (block_size == 0) {
        THD* thd = ha_thd();
        block_size = get_tokudb_block_size(thd);
    }

6140
    /* Create the main table that will hold the real rows */
6141
    error = create_sub_table(newname, &row_descriptor, txn, block_size, false);
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cleanup:    
    my_free(newname, MYF(MY_ALLOW_ZERO_PTR));
    my_free(row_desc_buff, MYF(MY_ALLOW_ZERO_PTR));
    return error;
}

//
// Creates a new table
// Parameters:
//      [in]    name - table name
//      [in]    form - info on table, columns and indexes
//      [in]    create_info - more info on table, CURRENTLY UNUSED
// Returns:
//      0 on success
//      error otherwise
//
int ha_tokudb::create(const char *name, TABLE * form, HA_CREATE_INFO * create_info) {
    TOKUDB_DBUG_ENTER("ha_tokudb::create");
    int error;
    DB *status_block = NULL;
    uint version;
    uint capabilities;
    DB_TXN* txn = NULL;
    char* newname = NULL;
6166
    KEY_AND_COL_INFO kc_info;
6167
    bool create_from_engine= (create_info->table_options & HA_OPTION_CREATE_FROM_ENGINE);
6168
    bzero(&kc_info, sizeof(kc_info));
6169

6170
    pthread_mutex_lock(&tokudb_meta_mutex);
6171

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    if (create_from_engine) {
        // table already exists, nothing to do
        error = 0;
        goto cleanup;
    }
    

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    newname = (char *)my_malloc(get_max_dict_name_path_length(name),MYF(MY_WME));
    if (newname == NULL){ error = ENOMEM; goto cleanup;}
6181

6182
    error = db_env->txn_begin(db_env, 0, &txn, 0);
6183
    if (error) { goto cleanup; }
6184

6185 6186
    primary_key = form->s->primary_key;
    hidden_primary_key = (primary_key  >= MAX_KEY) ? TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH : 0;
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    if (hidden_primary_key) {
        primary_key = form->s->keys;
    }
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    /* do some tracing */
    trace_create_table_info(name,form);

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    /* Create status.tokudb and save relevant metadata */
6195
    make_name(newname, name, "status");
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6197 6198 6199
    error = db_create(&status_block, db_env, 0);
    if (error) { goto cleanup; }

6200
    error = status_block->open(status_block, txn, newname, NULL, DB_BTREE, DB_CREATE | DB_EXCL, 0);
6201
    if (error) { goto cleanup; }
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6203 6204 6205
    version = HA_TOKU_VERSION;
    capabilities = HA_TOKU_CAP;
    
6206
    error = write_to_status(status_block, hatoku_new_version,&version,sizeof(version), txn);
6207
    if (error) { goto cleanup; }
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6208

6209
    error = write_to_status(status_block, hatoku_capabilities,&capabilities,sizeof(capabilities), txn);
6210 6211
    if (error) { goto cleanup; }

6212
    error = write_auto_inc_create(status_block, create_info->auto_increment_value, txn);
6213
    if (error) { goto cleanup; }
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6214

6215 6216 6217 6218 6219
    // only for tables that are not partitioned
    if (form->part_info == NULL) {
        error = write_frm_data(status_block, txn, form->s->path.str);
        if (error) { goto cleanup; }
    }
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    error = allocate_key_and_col_info(form->s, &kc_info);
    if (error) { goto cleanup; }

    error = initialize_key_and_col_info(
        form->s, 
        form,
        &kc_info,
        hidden_primary_key,
        primary_key
        );
    if (error) { goto cleanup; }
6231

6232
    error = create_main_dictionary(name, form, txn, &kc_info);
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    if (error) {
        goto cleanup;
    }

6237 6238 6239

    for (uint i = 0; i < form->s->keys; i++) {
        if (i != primary_key) {
6240
            error = create_secondary_dictionary(name, form, &form->key_info[i], txn, &kc_info, i, false);
6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252
            if (error) {
                goto cleanup;
            }

            error = write_key_name_to_status(status_block, form->s->key_info[i].name, txn);
            if (error) { goto cleanup; }
        }
    }

    error = add_table_to_metadata(name, form, txn);
    if (error) { goto cleanup; }

6253
    error = 0;
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cleanup:
    if (status_block != NULL) {
6256 6257
        int r = status_block->close(status_block, 0);
        assert(r==0);
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    }
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    free_key_and_col_info(&kc_info);
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    if (txn) {
        if (error) {
            abort_txn(txn);
        }
        else {
            commit_txn(txn,0);
        }
6267
    }
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    my_free(newname, MYF(MY_ALLOW_ZERO_PTR));
6269
    pthread_mutex_unlock(&tokudb_meta_mutex);
6270
    TOKUDB_DBUG_RETURN(error);
6271 6272
}

6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285
int ha_tokudb::discard_or_import_tablespace(my_bool discard) {
    /*
    if (discard) {
        my_errno=HA_ERR_WRONG_COMMAND;
        return my_errno;
    }
    return add_table_to_metadata(share->table_name);
    */
    my_errno=HA_ERR_WRONG_COMMAND;
    return my_errno;
}


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6286
//
6287 6288 6289 6290
// deletes from_name or renames from_name to to_name, all using transaction txn.
// is_delete specifies which we are doing
// is_key specifies if it is a secondary index (and hence a "key-" needs to be prepended) or
// if it is not a secondary index
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6291
//
6292
int ha_tokudb::delete_or_rename_dictionary( const char* from_name, const char* to_name, const char* secondary_name, bool is_key, DB_TXN* txn, bool is_delete) {
6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342
    int error;
    char dict_name[MAX_DICT_NAME_LEN];
    char* new_from_name = NULL;
    char* new_to_name = NULL;
    assert(txn);
    
    new_from_name = (char *)my_malloc(
        get_max_dict_name_path_length(from_name), 
        MYF(MY_WME)
        );
    if (new_from_name == NULL) {
        error = ENOMEM;
        goto cleanup;
    }
    if (!is_delete) {
        assert(to_name);
        new_to_name = (char *)my_malloc(
            get_max_dict_name_path_length(to_name), 
            MYF(MY_WME)
            );
        if (new_to_name == NULL) {
            error = ENOMEM;
            goto cleanup;
        }
    }
    
    if (is_key) {
        sprintf(dict_name, "key-%s", secondary_name);
        make_name(new_from_name, from_name, dict_name);
    }
    else {
        make_name(new_from_name, from_name, secondary_name);
    }
    if (!is_delete) {
        if (is_key) {
            sprintf(dict_name, "key-%s", secondary_name);
            make_name(new_to_name, to_name, dict_name);
        }
        else {
            make_name(new_to_name, to_name, secondary_name);
        }
    }

    if (is_delete) {    
        error = db_env->dbremove(db_env, txn, new_from_name, NULL, 0);
    }
    else {
        error = db_env->dbrename(db_env, txn, new_from_name, NULL, new_to_name, 0);
    }
    if (error) { goto cleanup; }
6343

6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355
cleanup:
    my_free(new_from_name, MYF(MY_ALLOW_ZERO_PTR));
    my_free(new_to_name, MYF(MY_ALLOW_ZERO_PTR));
    return error;
}


//
// deletes or renames a table. if is_delete is true, then we delete, and to_name can be NULL
// if is_delete is false, then to_name must be non-NULL, as we are renaming the table.
//
int ha_tokudb::delete_or_rename_table (const char* from_name, const char* to_name, bool is_delete) {
6356
    int error;
6357
    DB* status_db = NULL;
6358 6359 6360 6361 6362 6363
    DBC* status_cursor = NULL;
    DB_TXN* txn = NULL;
    DBT curr_key;
    DBT curr_val;
    bzero(&curr_key, sizeof(curr_key));
    bzero(&curr_val, sizeof(curr_val));
6364
    pthread_mutex_lock(&tokudb_meta_mutex);
6365

6366 6367 6368
    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) { goto cleanup; }

6369
    //
6370
    // modify metadata db
6371
    //
6372 6373
    if (is_delete) {
        error = drop_table_from_metadata(from_name, txn);
6374
    }
6375 6376
    else {
        error = rename_table_in_metadata(from_name, to_name, txn);
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6377
    }
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    if (error) { goto cleanup; }

    //
    // open status db,
    // create cursor,
    // for each name read out of there, create a db and delete or rename it
    //
    error = open_status_dictionary(&status_db, from_name, txn);
    if (error) { goto cleanup; }

    error = status_db->cursor(status_db, txn, &status_cursor, 0);
    if (error) { goto cleanup; }

    while (error != DB_NOTFOUND) {
        error = status_cursor->c_get(
            status_cursor,
            &curr_key,
            &curr_val,
            DB_NEXT
            );
        if (error && error != DB_NOTFOUND) { goto cleanup; }
        if (error == DB_NOTFOUND) { break; }

        HA_METADATA_KEY mk = *(HA_METADATA_KEY *)curr_key.data;
        if (mk != hatoku_key_name) {
            continue;
        }
        error = delete_or_rename_dictionary(from_name, to_name, (char *)((char *)curr_key.data + sizeof(HA_METADATA_KEY)), true, txn, is_delete);
        if (error) { goto cleanup; }
    }

    //
    // delete or rename main.tokudb
    //
    error = delete_or_rename_dictionary(from_name, to_name, "main", false, txn, is_delete);
    if (error) { goto cleanup; }

    error = status_cursor->c_close(status_cursor);
6416
    assert(error==0);
6417
    status_cursor = NULL;
6418
    if (error) { goto cleanup; }
6419 6420

    error = status_db->close(status_db, 0);
6421
    assert(error == 0);
6422 6423 6424 6425 6426 6427 6428 6429
    status_db = NULL;
    
    //
    // delete or rename status.tokudb
    //
    error = delete_or_rename_dictionary(from_name, to_name, "status", false, txn, is_delete);
    if (error) { goto cleanup; }

6430
    my_errno = error;
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6431
cleanup:
6432
    if (status_cursor) {
6433 6434
        int r = status_cursor->c_close(status_cursor);
        assert(r==0);
6435 6436
    }
    if (status_db) {
6437 6438
        int r = status_db->close(status_db, 0);
        assert(r==0);
6439 6440 6441 6442 6443 6444 6445 6446
    }
    if (txn) {
        if (error) {
            abort_txn(txn);
        }
        else {
            commit_txn(txn, 0);
        }
6447
    }
6448
    pthread_mutex_unlock(&tokudb_meta_mutex);
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    return error;
}


//
// Drops table
// Parameters:
//      [in]    name - name of table to be deleted
// Returns:
//      0 on success
//      error otherwise
//
int ha_tokudb::delete_table(const char *name) {
    TOKUDB_DBUG_ENTER("ha_tokudb::delete_table");
6463 6464
    int error;
    error = delete_or_rename_table(name, NULL, true);
6465
    if (error == DB_LOCK_NOTGRANTED && ((tokudb_debug & TOKUDB_DEBUG_HIDE_DDL_LOCK_ERRORS) == 0)) {
6466 6467 6468 6469 6470
        sql_print_error("Could not delete table %s because \
another transaction has accessed the table. \
To drop the table, make sure no transactions touch the table.", name);
    }
    TOKUDB_DBUG_RETURN(error);
6471 6472 6473
}


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//
// renames table from "from" to "to"
// Parameters:
//      [in]    name - old name of table
//      [in]    to - new name of table
// Returns:
//      0 on success
//      error otherwise
//
6483
int ha_tokudb::rename_table(const char *from, const char *to) {
6484
    TOKUDB_DBUG_ENTER("%s %s %s", __FUNCTION__, from, to);
6485
    int error;
6486
    error = delete_or_rename_table(from, to, false);
6487
    if (error == DB_LOCK_NOTGRANTED && ((tokudb_debug & TOKUDB_DEBUG_HIDE_DDL_LOCK_ERRORS) == 0)) {
6488 6489 6490 6491
        sql_print_error("Could not rename table from %s to %s because \
another transaction has accessed the table. \
To rename the table, make sure no transactions touch the table.", from, to);
    }
6492
    TOKUDB_DBUG_RETURN(error);
6493 6494 6495 6496
}


/*
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6497
  Returns estimate on number of seeks it will take to read through the table
6498 6499 6500
  This is to be comparable to the number returned by records_in_range so
  that we can decide if we should scan the table or use keys.
*/
6501
/// QQQ why divide by 3
6502
double ha_tokudb::scan_time() {
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6503
    TOKUDB_DBUG_ENTER("ha_tokudb::scan_time");
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6504
    double ret_val = (double)stats.records / 3;
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6505
    DBUG_RETURN(ret_val);
6506 6507
}

6508 6509
double ha_tokudb::keyread_time(uint index, uint ranges, ha_rows rows)
{
6510
  if ((table->key_info[index].flags & HA_CLUSTERING) || (index == primary_key)) {
6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527
    return read_time(index, ranges, rows);
  }
  /*
    It is assumed that we will read trough the whole key range and that all
    key blocks are half full (normally things are much better). It is also
    assumed that each time we read the next key from the index, the handler
    performs a random seek, thus the cost is proportional to the number of
    blocks read. This model does not take into account clustered indexes -
    engines that support that (e.g. InnoDB) may want to overwrite this method.
  */
  double keys_per_block= (stats.block_size/2.0/
                          (table->key_info[index].key_length +
                           ref_length) + 1);
  return (rows + keys_per_block - 1)/ keys_per_block;
}


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//
// Calculate the time it takes to read a set of ranges through an index
// This enables us to optimize reads for clustered indexes.
// Implementation pulled from InnoDB
// Parameters:
//          index - index to use
//          ranges - number of ranges
//          rows - estimated number of rows in the range
// Returns:
//      estimated time measured in disk seeks
//
double ha_tokudb::read_time(
6540 6541 6542 6543
    uint    index,
    uint    ranges,
    ha_rows rows
    )
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{
    double total_scan;
    double ret_val; 
6547
    bool is_primary = (index == primary_key);
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    bool is_clustering;
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6549

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    //
    // in case for hidden primary key, this is called
    //
    if (index >= table_share->keys) {
        ret_val = handler::read_time(index, ranges, rows);
        goto cleanup;
    }
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    is_clustering = (table->key_info[index].flags & HA_CLUSTERING);
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    //
    // if it is not the primary key, and it is not a clustering key, then return handler::read_time
    //
6564
    if (!(is_primary || is_clustering)) {
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        ret_val = handler::read_time(index, ranges, rows);
        goto cleanup;
    }

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    //
    // for primary key and for clustered keys, return a fraction of scan_time()
    //
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    total_scan = scan_time();

    if (stats.records < rows) {
6575
        ret_val = is_clustering ? total_scan + 0.00001 : total_scan;
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        goto cleanup;
    }

    //
    // one disk seek per range plus the proportional scan time of the rows
    //
    ret_val = (ranges + (double) rows / (double) stats.records * total_scan);
6583
    ret_val = is_clustering ? ret_val + 0.00001 : ret_val;
6584
    
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cleanup:
    return ret_val;
}


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6590
//
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// Estimates the number of index records in a range. In case of errors, return
//   HA_TOKUDB_RANGE_COUNT instead of HA_POS_ERROR. This was behavior
//   when we got the handlerton from MySQL.
// Parameters:
//              keynr -index to use 
//      [in]    start_key - low end of the range
//      [in]    end_key - high end of the range
// Returns:
//      0 - There are no matching keys in the given range
//      number > 0 - There are approximately number matching rows in the range
//      HA_POS_ERROR - Something is wrong with the index tree
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//
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ha_rows ha_tokudb::records_in_range(uint keynr, key_range* start_key, key_range* end_key) {
6604
    TOKUDB_DBUG_ENTER("ha_tokudb::records_in_range");
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    DBT key;
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    ha_rows ret_val = HA_TOKUDB_RANGE_COUNT;
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    DB *kfile = share->key_file[keynr];
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    u_int64_t less, equal, greater;
6609
    u_int64_t total_rows_estimate = HA_TOKUDB_RANGE_COUNT;
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    u_int64_t start_rows, end_rows, rows;
    int is_exact;
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    int error;
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    uchar inf_byte;
6614

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    //
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    // get start_rows and end_rows values so that we can estimate range
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    // when calling key_range64, the only value we can trust is the value for less
    // The reason is that the key being passed in may be a prefix of keys in the DB
    // As a result, equal may be 0 and greater may actually be equal+greater
    // So, we call key_range64 on the key, and the key that is after it.
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    //
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    if (!start_key && !end_key) {
        error = estimate_num_rows(kfile, &end_rows, transaction);
        if (error) {
            ret_val = HA_TOKUDB_RANGE_COUNT;
            goto cleanup;
        }
6628 6629
        ret_val = (end_rows <= 1) ? 1 : end_rows;
        goto cleanup;
6630
    }
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    if (start_key) {
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        inf_byte = (start_key->flag == HA_READ_KEY_EXACT) ? 
            COL_NEG_INF : COL_POS_INF;
        pack_key(
            &key, 
            keynr, 
            key_buff, 
            start_key->key, 
            start_key->length, 
            inf_byte
            ); 
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6642
        error = kfile->key_range64(
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            kfile, 
            transaction, 
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            &key,
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            &less,
            &equal,
            &greater,
            &is_exact
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            );
        if (error) {
            ret_val = HA_TOKUDB_RANGE_COUNT;
            goto cleanup;
        }
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        start_rows= less;
6656
        total_rows_estimate = less + equal + greater;
6657
    }
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    else {
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6659
        start_rows= 0;
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    }

    if (end_key) {
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        inf_byte = (end_key->flag == HA_READ_BEFORE_KEY) ?
            COL_NEG_INF : COL_POS_INF;
        pack_key(
            &key, 
            keynr, 
            key_buff, 
            end_key->key, 
            end_key->length, 
            inf_byte
            );
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6673
        error = kfile->key_range64(
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            kfile, 
            transaction, 
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            &key,
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            &less,
            &equal,
            &greater,
            &is_exact
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            );
        if (error) {
            ret_val = HA_TOKUDB_RANGE_COUNT;
            goto cleanup;
        }
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        end_rows= less;
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    }
    else {
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        //
        // first if-clause ensures that start_key is non-NULL
        //
        assert(start_key);
        end_rows = total_rows_estimate;
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    }

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    rows = (end_rows > start_rows) ? end_rows - start_rows : 1;
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6697

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    //
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    // MySQL thinks a return value of 0 means there are exactly 0 rows
    // Therefore, always return non-zero so this assumption is not made
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    //
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    ret_val = (ha_rows) (rows <= 1 ? 1 : rows);
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cleanup:
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6704
    DBUG_RETURN(ret_val);
6705 6706
}

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//
6709 6710 6711
// Initializes the auto-increment data in the local "share" object to the
// greater of two values: what's stored in the metadata or the last inserted
// auto-increment field (if auto-increment field is the first field of a key).
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//
void ha_tokudb::init_auto_increment() {
    DBT key;
    DBT value;
    int error;
    HA_METADATA_KEY key_val = hatoku_max_ai;
    bzero(&key, sizeof(key));
    bzero(&value, sizeof(value));
    key.data = &key_val;
    key.size = sizeof(key_val);
6722
    value.flags = DB_DBT_USERMEM;
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    DB_TXN* txn = NULL;

    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) {
        share->last_auto_increment = 0;    
    }
    else {
        //
        // First retrieve hatoku_max_ai, which is max value used by auto increment
        // column so far, the max value could have been auto generated (e.g. insert (NULL))
        // or it could have been manually inserted by user (e.g. insert (345))
        //
6735 6736
        value.ulen = sizeof(share->last_auto_increment);
        value.data = &share->last_auto_increment;
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        error = share->status_block->get(
            share->status_block, 
            txn, 
            &key, 
            &value, 
            0
            );
        
6745
        if (error || value.size != sizeof(share->last_auto_increment)) {
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            share->last_auto_increment = 0;
        }
6748

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        //
        // Now retrieve the initial auto increment value, as specified by create table
        // so if a user does "create table t1 (a int auto_increment, primary key (a)) auto_increment=100",
        // then the value 100 should be stored here
        //
        key_val = hatoku_ai_create_value;
6755 6756
        value.ulen = sizeof(share->auto_inc_create_value);
        value.data = &share->auto_inc_create_value;
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        error = share->status_block->get(
            share->status_block, 
            txn, 
            &key, 
            &value, 
            0
            );
        
6765
        if (error || value.size != sizeof(share->auto_inc_create_value)) {
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            share->auto_inc_create_value = 0;
        }

6769
        commit_txn(txn, 0);
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    }
    if (tokudb_debug & TOKUDB_DEBUG_AUTO_INCREMENT) {
        TOKUDB_TRACE("init auto increment:%lld\n", share->last_auto_increment);
    }
}

6776
void ha_tokudb::get_auto_increment(ulonglong offset, ulonglong increment, ulonglong nb_desired_values, ulonglong * first_value, ulonglong * nb_reserved_values) {
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6777
    TOKUDB_DBUG_ENTER("ha_tokudb::get_auto_increment");
6778 6779
    ulonglong nr;

6780
    pthread_mutex_lock(&share->mutex);
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    if (share->auto_inc_create_value > share->last_auto_increment) {
        nr = share->auto_inc_create_value;
        share->last_auto_increment = share->auto_inc_create_value;
6785
    }
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    else {
        nr = share->last_auto_increment + increment;
    }
    share->last_auto_increment = nr + (nb_desired_values - 1)*increment;
6790 6791
    if (delay_updating_ai_metadata) {
        ai_metadata_update_required = true;
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    }
    else {
        update_max_auto_inc(share->status_block, share->last_auto_increment);
    }
6796

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6797
    if (tokudb_debug & TOKUDB_DEBUG_AUTO_INCREMENT) {
6798 6799
        TOKUDB_TRACE("get_auto_increment(%lld,%lld,%lld):got:%lld:%lld\n",
                     offset, increment, nb_desired_values, nr, nb_desired_values);
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6800
    }
6801
    *first_value = nr;
6802
    *nb_reserved_values = nb_desired_values;
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6803
    pthread_mutex_unlock(&share->mutex);
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6804
    DBUG_VOID_RETURN;
6805 6806
}

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bool ha_tokudb::is_auto_inc_singleton(){
    return false;
}

6811 6812 6813 6814
//
// Internal function called by ha_tokudb::add_index and ha_tokudb::alter_table_phase2
// With a transaction, drops dictionaries associated with indexes in key_num
//
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//
// Adds indexes to the table. Takes the array of KEY passed in key_info, and creates
// DB's that will go at the end of share->key_file. THE IMPLICIT ASSUMPTION HERE is
// that the table will be modified and that these added keys will be appended to the end
// of the array table->key_info
// Parameters:
//      [in]    table_arg - table that is being modified, seems to be identical to this->table
//      [in]    key_info - array of KEY's to be added
//              num_of_keys - number of keys to be added, number of elements in key_info
//  Returns:
//      0 on success, error otherwise
//
6827 6828 6829 6830 6831 6832 6833 6834 6835 6836
int ha_tokudb::tokudb_add_index(
    TABLE *table_arg, 
    KEY *key_info, 
    uint num_of_keys, 
    DB_TXN* txn, 
    bool* inc_num_DBs,
    bool* modified_DBs
    ) 
{
    TOKUDB_DBUG_ENTER("ha_tokudb::tokudb_add_index");
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    int error;
    uint curr_index = 0;
    DBC* tmp_cursor = NULL;
    int cursor_ret_val = 0;
6841
    DBT curr_pk_key, curr_pk_val;
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6842
    THD* thd = ha_thd(); 
6843
    DB_LOADER* loader = NULL;
6844
    DB_INDEXER* indexer = NULL;
6845
    bool loader_use_puts = get_load_save_space(thd);
6846
    bool use_hot_index = (lock.type == TL_WRITE_ALLOW_WRITE);
6847
    u_int32_t loader_flags = loader_use_puts ? LOADER_USE_PUTS : 0;
6848 6849
    u_int32_t indexer_flags = 0;
    u_int32_t mult_db_flags[MAX_KEY + 1] = {0};
6850 6851
    u_int32_t mult_put_flags[MAX_KEY + 1];
    u_int32_t mult_dbt_flags[MAX_KEY + 1];
6852
    bool creating_hot_index = false;
6853 6854
    struct loader_context lc;
    memset(&lc, 0, sizeof lc);
6855 6856 6857
    lc.thd = thd;
    lc.ha = this;
    loader_error = 0;
6858
    bool rw_lock_taken = false;
6859 6860
    *inc_num_DBs = false;
    *modified_DBs = false;
6861
    for (u_int32_t i = 0; i < MAX_KEY+1; i++) {
6862
        mult_put_flags[i] = 0;
6863 6864
        mult_dbt_flags[i] = DB_DBT_REALLOC;
    }
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    //
    // number of DB files we have open currently, before add_index is executed
    //
    uint curr_num_DBs = table_arg->s->keys + test(hidden_primary_key);
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6869

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    //
    // status message to be shown in "show process list"
    //
    char status_msg[MAX_ALIAS_NAME + 200]; //buffer of 200 should be a good upper bound.
    ulonglong num_processed = 0; //variable that stores number of elements inserted thus far
6875
    read_lock_wait_time = get_read_lock_wait_time(ha_thd());
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    thd_proc_info(thd, "Adding indexes");

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    //
    // in unpack_row, MySQL passes a buffer that is this long,
    // so this length should be good enough for us as well
    //
6883 6884
    bzero((void *) &curr_pk_key, sizeof(curr_pk_key));
    bzero((void *) &curr_pk_val, sizeof(curr_pk_val));
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    //
    // The files for secondary tables are derived from the name of keys
    // If we try to add a key with the same name as an already existing key,
    // We can crash. So here we check if any of the keys added has the same
    // name of an existing key, and if so, we fail gracefully
    //
    for (uint i = 0; i < num_of_keys; i++) {
        for (uint j = 0; j < table_arg->s->keys; j++) {
            if (strcmp(key_info[i].name, table_arg->s->key_info[j].name) == 0) {
                error = HA_ERR_WRONG_COMMAND;
                goto cleanup;
            }
        }
    }
    
6901 6902
    rw_wrlock(&share->num_DBs_lock);
    rw_lock_taken = true;
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    //
    // open all the DB files and set the appropriate variables in share
    // they go to the end of share->key_file
    //
6907
    creating_hot_index = use_hot_index && num_of_keys == 1 && (key_info[0].flags & HA_NOSAME) == 0;
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    if (use_hot_index && (share->num_DBs > curr_num_DBs)) {
        //
        // already have hot index in progress, get out
        //
        error = HA_ERR_INTERNAL_ERROR;
        goto cleanup;
    }
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    curr_index = curr_num_DBs;
6916
    *modified_DBs = true;
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    for (uint i = 0; i < num_of_keys; i++, curr_index++) {
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        if (key_info[i].flags & HA_CLUSTERING) {
            set_key_filter(
6920
                &share->kc_info.key_filters[curr_index],
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                &key_info[i],
                table_arg,
                false
                );                
            if (!hidden_primary_key) {
                set_key_filter(
6927
                    &share->kc_info.key_filters[curr_index],
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                    &table_arg->key_info[primary_key],
                    table_arg,
                    false
                    );
            }

6934
            error = initialize_col_pack_info(&share->kc_info,table_arg->s,curr_index);
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            if (error) {
                goto cleanup;
            }
6938 6939

            share->rec_has_buff[curr_index] = true;
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        }


6943
        error = create_secondary_dictionary(share->table_name, table_arg, &key_info[i], txn, &share->kc_info, curr_index, creating_hot_index);
6944 6945
        if (error) { goto cleanup; }

6946
        error = open_secondary_dictionary(
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            &share->key_file[curr_index], 
            &key_info[i],
            share->table_name,
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6950
            false,
6951
            txn
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            );
        if (error) { goto cleanup; }
    }
    
6956
    if (creating_hot_index) {
6957
        share->num_DBs++;
6958
        *inc_num_DBs = true;
6959 6960 6961 6962 6963 6964 6965 6966 6967 6968 6969
        error = db_env->create_indexer(
            db_env,
            txn,
            &indexer,
            share->file,
            num_of_keys,
            &share->key_file[curr_num_DBs],
            mult_db_flags,
            indexer_flags
            );
        if (error) { goto cleanup; }
6970

6971 6972
        error = indexer->set_poll_function(indexer, ai_poll_fun, &lc);
        if (error) { goto cleanup; }
6973

6974 6975
        error = indexer->set_error_callback(indexer, loader_ai_err_fun, &lc);
        if (error) { goto cleanup; }
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6977 6978 6979 6980 6981
        rw_unlock(&share->num_DBs_lock);
        rw_lock_taken = false;
        
        error = indexer->build(indexer);
        if (error) { goto cleanup; }
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        error = indexer->close(indexer);
        if (error) { goto cleanup; }
        indexer = NULL;
6986
    }
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    else {
        rw_unlock(&share->num_DBs_lock);
        rw_lock_taken = false;
        error = db_env->create_loader(
            db_env, 
            txn, 
            &loader, 
            NULL, // no src_db needed
            num_of_keys, 
            &share->key_file[curr_num_DBs], 
            mult_put_flags,
            mult_dbt_flags,
            loader_flags
            );
        if (error) { goto cleanup; }
7002

7003 7004
        error = loader->set_poll_function(loader, poll_fun, &lc);
        if (error) { goto cleanup; }
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        error = loader->set_error_callback(loader, loader_ai_err_fun, &lc);
        if (error) { goto cleanup; }
        //
        // scan primary table, create each secondary key, add to each DB
        //    
7011
        if ((error = share->file->cursor(share->file, txn, &tmp_cursor, DB_SERIALIZABLE))) {
7012
            tmp_cursor = NULL;             // Safety
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            goto cleanup;
        }
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7015

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        //
        // grab some locks to make this go faster
        // first a global read lock on the main DB, because
        // we intend to scan the entire thing
        //
        lockretryN(read_lock_wait_time){
7022
            error = tmp_cursor->c_pre_acquire_range_lock(
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                tmp_cursor,
                share->file->dbt_neg_infty(),
                share->file->dbt_pos_infty()
                );
            lockretry_wait;
        }
7029
        if (error) { goto cleanup; }
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7030

7031
        cursor_ret_val = tmp_cursor->c_get(tmp_cursor, &curr_pk_key, &curr_pk_val, DB_NEXT | DB_PRELOCKED);
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7033 7034 7035
        while (cursor_ret_val != DB_NOTFOUND) {
            if (cursor_ret_val) {
                error = cursor_ret_val;
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                goto cleanup;
            }
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7038

7039 7040
            error = loader->put(loader, &curr_pk_key, &curr_pk_val);
            if (error) { goto cleanup; }
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7041

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            num_processed++; 

            if ((num_processed % 1000) == 0) {
                if (loader_use_puts) {
                    sprintf(status_msg, "Adding indexes: Processed %llu of about %llu rows.", num_processed, (long long unsigned) share->rows);
                }
                else {
                    sprintf(status_msg, "Adding indexes: Fetched %llu of about %llu rows, loading of data still remains.", num_processed, (long long unsigned) share->rows);
                }
                thd_proc_info(thd, status_msg);
                if (thd->killed) {
                    error = ER_ABORTING_CONNECTION;
                    goto cleanup;
                }
            }
            cursor_ret_val = tmp_cursor->c_get(tmp_cursor, &curr_pk_key, &curr_pk_val, DB_NEXT | DB_PRELOCKED);
        }
        error = tmp_cursor->c_close(tmp_cursor);
        assert(error==0);
        tmp_cursor = NULL;

        error = loader->close(loader);
        loader = NULL;
        if (error) goto cleanup;
    }
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    curr_index = curr_num_DBs;
    for (uint i = 0; i < num_of_keys; i++, curr_index++) {
        if (key_info[i].flags & HA_NOSAME) {
            bool is_unique;
            error = is_index_unique(
                &is_unique, 
                txn, 
                share->key_file[curr_index], 
                &key_info[i]
                );
            if (error) goto cleanup;
            if (!is_unique) {
                error = HA_ERR_FOUND_DUPP_KEY;
                last_dup_key = i;
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                goto cleanup;
            }
        }
    }

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    //
    // We have an accurate row count, might as well update share->rows
    //
    pthread_mutex_lock(&share->mutex);
    share->rows = num_processed;
    pthread_mutex_unlock(&share->mutex);
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    //
    // now write stuff to status.tokudb
    //
    pthread_mutex_lock(&share->mutex);
    for (uint i = 0; i < num_of_keys; i++) {
        write_key_name_to_status(share->status_block, key_info[i].name, txn);
    }
    pthread_mutex_unlock(&share->mutex);
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    error = 0;
cleanup:
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    if (rw_lock_taken) {
        rw_unlock(&share->num_DBs_lock);
        rw_lock_taken = false;
    }
7108
    if (tmp_cursor) {            
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        int r = tmp_cursor->c_close(tmp_cursor);
        assert(r==0);
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        tmp_cursor = NULL;
    }
7113
    if (loader != NULL) {
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        sprintf(status_msg, "aborting creation of indexes.");
        thd_proc_info(thd, status_msg);
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        loader->abort(loader);
    }
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    if (indexer != NULL) {
        sprintf(status_msg, "aborting creation of indexes.");
        thd_proc_info(thd, status_msg);
        indexer->abort(indexer);
    }
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    if (error == DB_LOCK_NOTGRANTED && ((tokudb_debug & TOKUDB_DEBUG_HIDE_DDL_LOCK_ERRORS) == 0)) {
        sql_print_error("Could not add indexes to table %s because \
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another transaction has accessed the table. \
To add indexes, make sure no transactions touch the table.", share->table_name);
7127
    }
7128
    TOKUDB_DBUG_RETURN(error ? error : loader_error);
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}

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//
// Internal function called by ha_tokudb::add_index and ha_tokudb::alter_table_phase2
// Closes added indexes in case of error in error path of add_index and alter_table_phase2
//
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void ha_tokudb::restore_add_index(TABLE* table_arg, uint num_of_keys, bool incremented_numDBs, bool modified_DBs) {
    uint curr_num_DBs = table_arg->s->keys + test(hidden_primary_key);
    uint curr_index = 0;

    //
    // need to restore num_DBs, and we have to do it before we close the dictionaries
    // so that there is not a window 
    //
    if (incremented_numDBs) {
        rw_wrlock(&share->num_DBs_lock);
        share->num_DBs--;
    }
    if (modified_DBs) {
        curr_index = curr_num_DBs;
        for (uint i = 0; i < num_of_keys; i++, curr_index++) {
            reset_key_and_col_info(&share->kc_info, curr_index);
        }
        curr_index = curr_num_DBs;
        for (uint i = 0; i < num_of_keys; i++, curr_index++) {
            if (share->key_file[curr_index]) {
                int r = share->key_file[curr_index]->close(
                    share->key_file[curr_index],
                    0
                    );
                assert(r==0);
                share->key_file[curr_index] = NULL;
            }
        }
    }
    if (incremented_numDBs) {
        rw_unlock(&share->num_DBs_lock);
    }
}
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int ha_tokudb::add_index(TABLE *table_arg, KEY *key_info, uint num_of_keys) {
    TOKUDB_DBUG_ENTER("ha_tokudb::add_index");
    DB_TXN* txn = NULL;
    int error;
    bool incremented_numDBs = false;
    bool modified_DBs = false;
    
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    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) { goto cleanup; }
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    error = tokudb_add_index(
        table_arg,
        key_info,
        num_of_keys,
        txn,
        &incremented_numDBs,
        &modified_DBs
        );
    if (error) { goto cleanup; }
    
cleanup:
    if (error) {
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        if (txn) {
            restore_add_index(table_arg, num_of_keys, incremented_numDBs, modified_DBs);
            abort_txn(txn);
        }
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    }
    else {
      commit_txn(txn, 0);
    }
    TOKUDB_DBUG_RETURN(error);
}

7202 7203 7204 7205
//
// Internal function called by ha_tokudb::prepare_drop_index and ha_tokudb::alter_table_phase2
// With a transaction, drops dictionaries associated with indexes in key_num
//
7206 7207
int ha_tokudb::drop_indexes(TABLE *table_arg, uint *key_num, uint num_of_keys, DB_TXN* txn) {
    TOKUDB_DBUG_ENTER("ha_tokudb::drop_indexes");
7208
    int error = 0;
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    for (uint i = 0; i < num_of_keys; i++) {
        uint curr_index = key_num[i];
        error = share->key_file[curr_index]->pre_acquire_fileops_lock(share->key_file[curr_index],txn);
        if (error != 0) {
            goto cleanup;
        }
    }
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    for (uint i = 0; i < num_of_keys; i++) {
        uint curr_index = key_num[i];
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        int r = share->key_file[curr_index]->close(share->key_file[curr_index],0);
        assert(r==0);
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        share->key_file[curr_index] = NULL;

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        error = remove_key_name_from_status(share->status_block, table_arg->key_info[curr_index].name, txn);
        if (error) { goto cleanup; }
        
        error = delete_or_rename_dictionary(share->table_name, NULL, table_arg->key_info[curr_index].name, true, txn, true);
        if (error) { goto cleanup; }
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    }
7229

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cleanup:
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    if (error == DB_LOCK_NOTGRANTED && ((tokudb_debug & TOKUDB_DEBUG_HIDE_DDL_LOCK_ERRORS) == 0)) {
        sql_print_error("Could not drop indexes from table %s because \
7233 7234
another transaction has accessed the table. \
To drop indexes, make sure no transactions touch the table.", share->table_name);
7235
    }
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    TOKUDB_DBUG_RETURN(error);
}

7239 7240 7241 7242
//
// Internal function called by ha_tokudb::prepare_drop_index and ha_tokudb::alter_table_phase2
// Restores dropped indexes in case of error in error path of prepare_drop_index and alter_table_phase2
//
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void ha_tokudb::restore_drop_indexes(TABLE *table_arg, uint *key_num, uint num_of_keys) {
    //
    // reopen closed dictionaries
    //
    for (uint i = 0; i < num_of_keys; i++) {
        int r;
        uint curr_index = key_num[i];
        if (share->key_file[curr_index] == NULL) {
            r = open_secondary_dictionary(
                &share->key_file[curr_index], 
                &table_share->key_info[curr_index],
                share->table_name,
                false, // 
                NULL
                );
            assert(!r);
        }
    }            
}
//
// Prepares to drop indexes to the table. For each value, i, in the array key_num,
// table->key_info[i] is a key that is to be dropped.
//  ***********NOTE*******************
// Although prepare_drop_index is supposed to just get the DB's ready for removal,
// and not actually do the removal, we are doing it here and not in final_drop_index
// For the flags we expose in alter_table_flags, namely xxx_NO_WRITES, this is allowed
// Changes for "future-proofing" this so that it works when we have the equivalent flags
// that are not NO_WRITES are not worth it at the moments
// Parameters:
//      [in]    table_arg - table that is being modified, seems to be identical to this->table
//      [in]    key_num - array of indexes that specify which keys of the array table->key_info
//                  are to be dropped
//              num_of_keys - size of array, key_num
//  Returns:
//      0 on success, error otherwise
//
int ha_tokudb::prepare_drop_index(TABLE *table_arg, uint *key_num, uint num_of_keys) {
    TOKUDB_DBUG_ENTER("ha_tokudb::prepare_drop_index");
    int error;
    DB_TXN* txn = NULL;

    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) { goto cleanup; }
    
    error = drop_indexes(table_arg, key_num, num_of_keys, txn);
    if (error) { goto cleanup; }

cleanup:
    if (txn) {
        if (error) {
            abort_txn(txn);
            restore_drop_indexes(table_arg, key_num, num_of_keys);
        }
        else {
            commit_txn(txn,0);
        }
    }
    TOKUDB_DBUG_RETURN(error);
}

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//  ***********NOTE*******************
// Although prepare_drop_index is supposed to just get the DB's ready for removal,
// and not actually do the removal, we are doing it here and not in final_drop_index
// For the flags we expose in alter_table_flags, namely xxx_NO_WRITES, this is allowed
// Changes for "future-proofing" this so that it works when we have the equivalent flags
// that are not NO_WRITES are not worth it at the moments, therefore, we can make
// this function just return
int ha_tokudb::final_drop_index(TABLE *table_arg) {
    TOKUDB_DBUG_ENTER("ha_tokudb::final_drop_index");
    TOKUDB_DBUG_RETURN(0);
}

7316
void ha_tokudb::print_error(int error, myf errflag) {
7317
    if (error == DB_LOCK_DEADLOCK)
7318
        error = HA_ERR_LOCK_DEADLOCK;
7319
    if (error == DB_LOCK_NOTGRANTED)
7320
        error = HA_ERR_LOCK_WAIT_TIMEOUT;
7321
#if defined(HA_ERR_DISK_FULL)
7322 7323 7324
    if (error == ENOSPC) {
        error = HA_ERR_DISK_FULL;
    }
7325
#endif
7326 7327 7328
    if (error == DB_KEYEXIST) {
        error = HA_ERR_FOUND_DUPP_KEY;
    }
7329
#if defined(HA_ALTER_ERROR)
7330 7331
    if (error == HA_ALTER_ERROR) {
        error = HA_ERR_UNSUPPORTED;
7332 7333
    }
#endif
7334 7335 7336
    handler::print_error(error, errflag);
}

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7337
#if 0 // QQQ use default
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//
// This function will probably need to be redone from scratch
// if we ever choose to implement it
//
7342
int ha_tokudb::analyze(THD * thd, HA_CHECK_OPT * check_opt) {
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    uint i;
    DB_BTREE_STAT *stat = 0;
    DB_TXN_STAT *txn_stat_ptr = 0;
    tokudb_trx_data *trx = (tokudb_trx_data *) thd->ha_data[tokudb_hton->slot];
    DBUG_ASSERT(trx);

    for (i = 0; i < table_share->keys; i++) {
        if (stat) {
            free(stat);
            stat = 0;
        }
        if ((key_file[i]->stat) (key_file[i], trx->all, (void *) &stat, 0))
            goto err;
        share->rec_per_key[i] = (stat->bt_ndata / (stat->bt_nkeys ? stat->bt_nkeys : 1));
    }
    /* A hidden primary key is not in key_file[] */
    if (hidden_primary_key) {
        if (stat) {
            free(stat);
            stat = 0;
        }
        if ((file->stat) (file, trx->all, (void *) &stat, 0))
            goto err;
    }
    pthread_mutex_lock(&share->mutex);
    share->status |= STATUS_TOKUDB_ANALYZE;        // Save status on close
    share->version++;           // Update stat in table
    pthread_mutex_unlock(&share->mutex);
    update_status(share, table);        // Write status to file
    if (stat)
        free(stat);
    return ((share->status & STATUS_TOKUDB_ANALYZE) ? HA_ADMIN_FAILED : HA_ADMIN_OK);

  err:
    if (stat)
        free(stat);
    return HA_ADMIN_FAILED;
7380
}
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7381
#endif
7382

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//
// flatten all DB's in this table, to do so, just do a full scan on every DB
//
7386
int ha_tokudb::optimize(THD * thd, HA_CHECK_OPT * check_opt) {
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7387
    TOKUDB_DBUG_ENTER("ha_tokudb::optimize");
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    int error;
    DBC* tmp_cursor = NULL;
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    tokudb_trx_data *trx = NULL;
    DB_TXN* txn = NULL;
    bool do_commit = false;
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7393
    uint curr_num_DBs = table->s->keys + test(hidden_primary_key);
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    trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
    if (trx == NULL) {
        error = HA_ERR_UNSUPPORTED;
        goto cleanup;
    }

    //
    // optimize may be called without a valid transaction, so we have to do this
    // in order to get a valid transaction
    // this is a bit hacky, but it is the best we have right now
    //
7406
    txn = trx->sub_sp_level ? trx->sub_sp_level : trx->sp_level;
7407 7408
    if (txn == NULL) { 
        error = db_env->txn_begin(db_env, NULL, &txn, DB_READ_UNCOMMITTED);
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        if (error) {
            goto cleanup;
        }
        do_commit = true;
    }
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    //
    // for each DB, scan through entire table and do nothing
    //
    for (uint i = 0; i < curr_num_DBs; i++) {
7419 7420 7421 7422
        error = share->key_file[i]->optimize(share->key_file[i]);
        if (error) {
            goto cleanup;
        }
7423 7424
        error = share->key_file[i]->cursor(share->key_file[i], txn, &tmp_cursor, 0);
        if (error) {
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            tmp_cursor = NULL;
            goto cleanup;
        }
        while (error != DB_NOTFOUND) {
7429
            error = tmp_cursor->c_getf_next(tmp_cursor, DB_PRELOCKED, smart_dbt_do_nothing, NULL);
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            if (error && error != DB_NOTFOUND) {
                goto cleanup;
            }
        }
7434 7435
        error = tmp_cursor->c_close(tmp_cursor);
        assert(error==0);
7436
        tmp_cursor = NULL;
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    }

    error = 0;
cleanup:
7441
    if (tmp_cursor) {
7442 7443
        int r = tmp_cursor->c_close(tmp_cursor);
        assert(r==0);
7444 7445
        tmp_cursor = NULL;
    }
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7446
    if (do_commit) {
7447
        commit_txn(txn, 0);
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    }
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    TOKUDB_DBUG_RETURN(error);
7450 7451
}

7452 7453 7454 7455 7456 7457 7458 7459 7460 7461
//
// truncate's dictionary associated with keynr index using transaction txn
// does so by deleting and then recreating the dictionary in the context
// of a transaction
//
int ha_tokudb::truncate_dictionary( uint keynr, DB_TXN* txn ) {
    int error;
    bool is_pk = (keynr == primary_key);
    
    error = share->key_file[keynr]->close(share->key_file[keynr], 0);
7462
    assert(error == 0);
7463 7464 7465 7466 7467 7468 7469 7470 7471

    share->key_file[keynr] = NULL;
    if (is_pk) { share->file = NULL; }

    if (is_pk) {
        error = delete_or_rename_dictionary(
            share->table_name, 
            NULL,
            "main", 
7472
            false, //is_key
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            txn,
            true // is a delete
            );
        if (error) { goto cleanup; }
    }
    else {
        error = delete_or_rename_dictionary(
            share->table_name, 
            NULL,
            table_share->key_info[keynr].name, 
7483
            true, //is_key
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            txn,
            true // is a delete
            );
        if (error) { goto cleanup; }
    }

    if (is_pk) {
7491
        error = create_main_dictionary(share->table_name, table, txn, &share->kc_info);
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    }
    else {
        error = create_secondary_dictionary(
            share->table_name, 
            table, 
            &table_share->key_info[keynr], 
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            txn,
            &share->kc_info,
7500 7501
            keynr,
            false
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            );
    }
    if (error) { goto cleanup; }

cleanup:
    return error;
}

7510 7511 7512 7513 7514 7515 7516 7517 7518

//
// for 5.5
//
int ha_tokudb::truncate() {
    return delete_all_rows();
}


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// delete all rows from a table
//
// effects: delete all of the rows in the main dictionary and all of the
// indices.  this must be atomic, so we use the statement transaction
// for all of the truncate operations.
// locks:  if we have an exclusive table write lock, all of the concurrency
// issues go away.
// returns: 0 if success

int ha_tokudb::delete_all_rows() {
    TOKUDB_DBUG_ENTER("delete_all_rows");
    int error = 0;
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    uint curr_num_DBs = 0;
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    DB_TXN* txn = NULL;

    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) { goto cleanup; }
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    if (thd_sql_command(ha_thd()) != SQLCOM_TRUNCATE) {
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        share->try_table_lock = true;
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        error = HA_ERR_WRONG_COMMAND;
        goto cleanup;
    }

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    curr_num_DBs = table->s->keys + test(hidden_primary_key);
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    for (uint i = 0; i < curr_num_DBs; i++) {
        error = share->key_file[i]->pre_acquire_fileops_lock(
            share->key_file[i], 
            txn
            );
        if (error) { goto cleanup; }
    }
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    for (uint i = 0; i < curr_num_DBs; i++) {
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        error = truncate_dictionary(i, txn);
        if (error) { goto cleanup; }
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    }

    // zap the row count
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    if (error == 0) {
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        share->rows = 0;
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    }
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    share->try_table_lock = true;
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cleanup:
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    if (txn) {
        if (error) {
            abort_txn(txn);
        }
        else {
            commit_txn(txn,0);
        }
    }

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            if (error == DB_LOCK_NOTGRANTED && ((tokudb_debug & TOKUDB_DEBUG_HIDE_DDL_LOCK_ERRORS) == 0)) {
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                sql_print_error("Could not truncate table %s because \
another transaction has accessed the table. \
To truncate the table, make sure no transactions touch the table.", share->table_name);
            }
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    //
    // regardless of errors, need to reopen the DB's
    //    
    for (uint i = 0; i < curr_num_DBs; i++) {
        int r = 0;
        if (share->key_file[i] == NULL) {
            if (i != primary_key) {
                r = open_secondary_dictionary(
                    &share->key_file[i], 
                    &table_share->key_info[i],
                    share->table_name,
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                    false, // 
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                    NULL
                    );
                assert(!r);
            }
            else {
                r = open_main_dictionary(
                    share->table_name, 
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                    false, 
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                    NULL
                    );
                assert(!r);
            }
        }
    }
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    TOKUDB_DBUG_RETURN(error);
}

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void ha_tokudb::set_loader_error(int err) {
    loader_error = err;
}
void ha_tokudb::set_dup_value_for_pk(DBT* key) {
    assert(!hidden_primary_key);
    unpack_key(table->record[0],key,primary_key);
    last_dup_key = primary_key;
}
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//
// MySQL sets the null_bit as a number that you can bit-wise AND a byte to
// to evaluate whether a field is NULL or not. This value is a power of 2, from
// 2^0 to 2^7. We return the position of the bit within the byte, which is
// lg null_bit
//
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inline u_int32_t get_null_bit_position(u_int32_t null_bit) {
    u_int32_t retval = 0;
    switch(null_bit) {
    case (1):
        retval = 0;
        break;
    case (2):
        retval = 1;
        break;
    case (4):
        retval = 2;
        break;
    case (8):
        retval = 3;
        break;
    case (16):
        retval = 4;
        break;
    case (32):
        retval = 5;
        break;
    case (64):
        retval = 6;
        break;
    case (128):
        retval = 7;
        break;        
    default:
        assert(false);
    }
    return retval;
}

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//
// checks whether the bit at index pos in data is set or not
//
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inline bool is_overall_null_position_set(uchar* data, u_int32_t pos) {
    u_int32_t offset = pos/8;
    uchar remainder = pos%8; 
    uchar null_bit = 1<<remainder;
    return ((data[offset] & null_bit) != 0);
}

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//
// sets the bit at index pos in data to 1 if is_null, 0 otherwise
// 
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inline void set_overall_null_position(uchar* data, u_int32_t pos, bool is_null) {
    u_int32_t offset = pos/8;
    uchar remainder = pos%8;
    uchar null_bit = 1<<remainder;
    if (is_null) {
        data[offset] |= null_bit;
    }
    else {
        data[offset] &= ~null_bit;
    }
}

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//
// returns the index of the null bit of field. 
//
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inline u_int32_t get_overall_null_bit_position(TABLE* table, Field* field) {
    u_int32_t offset = get_null_offset(table, field);
    u_int32_t null_bit = field->null_bit;
    return offset*8 + get_null_bit_position(null_bit);
}


bool are_null_bits_in_order(TABLE* table) {
    u_int32_t curr_null_pos = 0;
    bool first = true;
    bool retval = true;
    for (uint i = 0; i < table->s->fields; i++) {
        Field* curr_field = table->field[i];
        bool nullable = (curr_field->null_bit != 0);
        if (nullable) {
            u_int32_t pos = get_overall_null_bit_position(
                table,
                curr_field
                );
            if (!first && pos != curr_null_pos+1){
                retval = false;
                break;
            }
            first = false;
            curr_null_pos = pos;
        }
    }
    return retval;
}

u_int32_t get_first_null_bit_pos(TABLE* table) {
    u_int32_t table_pos = 0;
    for (uint i = 0; i < table->s->fields; i++) {
        Field* curr_field = table->field[i];
        bool nullable = (curr_field->null_bit != 0);
        if (nullable) {
            table_pos = get_overall_null_bit_position(
                table,
                curr_field
                );
            break;
        }
    }
    return table_pos;
}

bool is_column_default_null(TABLE* src_table, u_int32_t field_index) {
    Field* curr_field = src_table->field[field_index];
    bool is_null_default = false;
    bool nullable = curr_field->null_bit != 0;
    if (nullable) {
        u_int32_t null_bit_position = get_overall_null_bit_position(src_table, curr_field);
        is_null_default = is_overall_null_position_set(
            src_table->s->default_values,
            null_bit_position
            );
    }
    return is_null_default;
}

bool columns_have_default_null_blobs(
    u_int32_t* changed_columns,
    u_int32_t num_changed_columns,
    TABLE* table 
) {
    bool retval = true;
    for (u_int32_t i = 0; i < num_changed_columns; i++) {
        Field* curr_field = table->field[changed_columns[i]];
        TOKU_TYPE field_type = mysql_to_toku_type (curr_field);
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        if (field_type == toku_type_blob && !is_column_default_null(table,changed_columns[i])) {
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            retval = false;
            break;
        }
    }
    return retval;
}

bool tables_have_same_keys(TABLE* table, TABLE* altered_table, bool print_error) {
    bool retval;
    if (table->s->keys != altered_table->s->keys) {
        if (print_error) {
            sql_print_error("tables have different number of keys");
        }
        retval = false;
        goto cleanup;
    }
    if (table->s->primary_key != altered_table->s->primary_key) {
        if (print_error) {
            sql_print_error(
                "Tables have different primary keys, %d %d", 
                table->s->primary_key,
                altered_table->s->primary_key
                );
        }
        retval = false;
        goto cleanup;
    }
    for (u_int32_t i=0; i < table->s->keys; i++) {
        KEY* curr_orig_key = &table->key_info[i];
        KEY* curr_altered_key = &altered_table->key_info[i];
        if (strcmp(curr_orig_key->name, curr_altered_key->name)) {
            if (print_error) {
                sql_print_error(
                    "key %d has different name, %s %s", 
                    i, 
                    curr_orig_key->name,
                    curr_altered_key->name
                    );
            }
            retval = false;
            goto cleanup;
        }
        if (((curr_orig_key->flags & HA_CLUSTERING) == 0) != ((curr_altered_key->flags & HA_CLUSTERING) == 0)) {
            if (print_error) {
                sql_print_error(
                    "keys disagree on if they are clustering, %d, %d",
                    curr_orig_key->key_parts,
                    curr_altered_key->key_parts
                    );
            }
            retval = false;
            goto cleanup;
        }
        if (((curr_orig_key->flags & HA_NOSAME) == 0) != ((curr_altered_key->flags & HA_NOSAME) == 0)) {
            if (print_error) {
                sql_print_error(
                    "keys disagree on if they are unique, %d, %d",
                    curr_orig_key->key_parts,
                    curr_altered_key->key_parts
                    );
            }
            retval = false;
            goto cleanup;
        }
        if (curr_orig_key->key_parts != curr_altered_key->key_parts) {
            if (print_error) {
                sql_print_error(
                    "keys have different number of parts, %d, %d",
                    curr_orig_key->key_parts,
                    curr_altered_key->key_parts
                    );
            }
            retval = false;
            goto cleanup;
        }
        //
        // now verify that each field in the key is the same
        //
        for (u_int32_t j = 0; j < curr_orig_key->key_parts; j++) {
            KEY_PART_INFO* curr_orig_part = &curr_orig_key->key_part[j];
            KEY_PART_INFO* curr_altered_part = &curr_altered_key->key_part[j];
            Field* curr_orig_field = curr_orig_part->field;
            Field* curr_altered_field = curr_altered_part->field;
            if (curr_orig_part->length != curr_altered_part->length) {
                if (print_error) {
                    sql_print_error(
                        "Key %s has different length at index %d", 
                        curr_orig_key->name, 
                        j
                        );
                }
                retval = false;
                goto cleanup;
            }
            if (!are_two_fields_same(curr_orig_field,curr_altered_field)) {
                if (print_error) {
                    sql_print_error(
                        "Key %s has different field at index %d", 
                        curr_orig_key->name, 
                        j
                        );
                }
                retval = false;
                goto cleanup;
            }
        }
    }

    retval = true;
cleanup:
    return retval;
}

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#if defined(HA_GENERAL_ONLINE)

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void ha_tokudb::print_alter_info(
    TABLE *altered_table,
    HA_CREATE_INFO *create_info,
    HA_ALTER_FLAGS *alter_flags,
    uint table_changes
    )
{
    printf("***are keys of two tables same? %d\n", tables_have_same_keys(table,altered_table,false));
    printf("***alter flags set ***\n");
    for (uint i = 0; i < HA_MAX_ALTER_FLAGS; i++) {
      if (alter_flags->is_set(i)) {
        printf("flag: %d\n", i);
      }
    }
    //
    // everyone calculates data by doing some default_values - record[0], but I do not see why
    // that is necessary
    //
    printf("******\n");
    printf("***orig table***\n");
    for (uint i = 0; i < table->s->fields; i++) {
      //
      // make sure to use table->field, and NOT table->s->field
      //
      Field* curr_field = table->field[i];
      uint null_offset = get_null_offset(table, curr_field);
      printf(
          "name: %s, nullable: %d, null_offset: %d, is_null_field: %d, is_null %d, \n", 
          curr_field->field_name, 
          curr_field->null_bit,
          null_offset,
          (curr_field->null_ptr != NULL),
          (curr_field->null_ptr != NULL) ? table->s->default_values[null_offset] & curr_field->null_bit : 0xffffffff
          );
    }
    printf("******\n");
    printf("***altered table***\n");
    for (uint i = 0; i < altered_table->s->fields; i++) {
      Field* curr_field = altered_table->field[i];
      uint null_offset = get_null_offset(altered_table, curr_field);
      printf(
         "name: %s, nullable: %d, null_offset: %d, is_null_field: %d, is_null %d, \n", 
         curr_field->field_name, 
         curr_field->null_bit,
         null_offset,
         (curr_field->null_ptr != NULL),
         (curr_field->null_ptr != NULL) ? altered_table->s->default_values[null_offset] & curr_field->null_bit : 0xffffffff
         );
    }
    printf("******\n");
}


int find_changed_columns(
    u_int32_t* changed_columns,
    u_int32_t* num_changed_columns,
    TABLE* smaller_table, 
    TABLE* bigger_table
    ) 
{
    uint curr_new_col_index = 0;
    uint i = 0;
    int retval;
    u_int32_t curr_num_changed_columns=0;
    assert(bigger_table->s->fields > smaller_table->s->fields);
    for (i = 0; i < smaller_table->s->fields; i++, curr_new_col_index++) {
        if (curr_new_col_index >= bigger_table->s->fields) {
            sql_print_error("error in determining changed columns");
            retval = 1;
            goto cleanup;
        }
        Field* curr_field_in_new = bigger_table->field[curr_new_col_index];
        Field* curr_field_in_orig = smaller_table->field[i];
        while (!fields_have_same_name(curr_field_in_orig, curr_field_in_new)) {
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            changed_columns[curr_num_changed_columns] = curr_new_col_index;
            curr_num_changed_columns++;
            curr_new_col_index++;
            curr_field_in_new = bigger_table->field[curr_new_col_index];
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            if (curr_new_col_index >= bigger_table->s->fields) {
                sql_print_error("error in determining changed columns");
                retval = 1;
                goto cleanup;
            }
        }
        // at this point, curr_field_in_orig and curr_field_in_new should be the same, let's verify
        // make sure the two fields that have the same name are ok
        if (!are_two_fields_same(curr_field_in_orig, curr_field_in_new)) {
            sql_print_error(
                "Two fields that were supposedly the same are not: \
                %s in original, %s in new", 
                curr_field_in_orig->field_name,
                curr_field_in_new->field_name
                );
            retval = 1;
            goto cleanup;
        }
    }
    for (i = curr_new_col_index; i < bigger_table->s->fields; i++) {
        changed_columns[curr_num_changed_columns] = i;
        curr_num_changed_columns++;
    }
    *num_changed_columns = curr_num_changed_columns;
    retval = 0;
cleanup:
    return retval;
}

int ha_tokudb::check_if_supported_alter(TABLE *altered_table,
    HA_CREATE_INFO *create_info,
    HA_ALTER_FLAGS *alter_flags,
    uint table_changes)
{
    TOKUDB_DBUG_ENTER("check_if_supported_alter");
    int retval;
    THD* thd = ha_thd(); 
    bool keys_same = tables_have_same_keys(table,altered_table, false);


    if (tokudb_debug & TOKUDB_DEBUG_ALTER_TABLE_INFO) {
        print_alter_info(altered_table, create_info, alter_flags, table_changes);
    }
    bool has_added_columns = alter_flags->is_set(HA_ADD_COLUMN);
    bool has_dropped_columns = alter_flags->is_set(HA_DROP_COLUMN);
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    //
    // We do not check for changes to foreign keys or primary keys. They are not supported
    // Changing the primary key implies changing keys in all dictionaries. that is why we don't
    // try to make it fast
    //
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    bool has_indexing_changes = alter_flags->is_set(HA_DROP_INDEX) || 
                                alter_flags->is_set(HA_DROP_UNIQUE_INDEX) ||
                                alter_flags->is_set(HA_ADD_INDEX) ||
                                alter_flags->is_set(HA_ADD_UNIQUE_INDEX);
    bool has_non_indexing_changes = false;
    bool has_non_dropped_changes = false;
    bool has_non_added_changes = false;
    for (uint i = 0; i < HA_MAX_ALTER_FLAGS; i++) {
        if (i == HA_DROP_INDEX ||
            i == HA_DROP_UNIQUE_INDEX ||
            i == HA_ADD_INDEX ||
            i == HA_ADD_UNIQUE_INDEX)
        {
            continue;
        }
        if (alter_flags->is_set(i)) {
            has_non_indexing_changes = true;
            break;
        }
    }
    for (uint i = 0; i < HA_MAX_ALTER_FLAGS; i++) {
        if (i == HA_DROP_COLUMN) {
            continue;
        }
        if (keys_same && 
            (i == HA_ALTER_INDEX || i == HA_ALTER_UNIQUE_INDEX || i == HA_ALTER_PK_INDEX)) {
            continue;
        }
        if (alter_flags->is_set(i)) {
            has_non_dropped_changes = true;
            break;
        }
    }
    for (uint i = 0; i < HA_MAX_ALTER_FLAGS; i++) {
        if (i == HA_ADD_COLUMN) {
            continue;
        }
        if (keys_same && 
            (i == HA_ALTER_INDEX || i == HA_ALTER_UNIQUE_INDEX || i == HA_ALTER_PK_INDEX)) {
            continue;
        }
        if (alter_flags->is_set(i)) {
            has_non_added_changes = true;
            break;
        }
    }

    if (tokudb_debug & TOKUDB_DEBUG_ALTER_TABLE_INFO) {
        printf("has indexing changes %d, has non indexing changes %d\n", has_indexing_changes, has_non_indexing_changes);
    }
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#ifdef MARIADB_BASE_VERSION
#if MYSQL_VERSION_ID >= 50203
    if (table->s->vfields || altered_table->s->vfields) {
      retval = HA_ALTER_ERROR;
      goto cleanup;
    }
#endif
#endif
8053 8054 8055 8056 8057 8058 8059 8060 8061 8062 8063 8064 8065 8066 8067 8068 8069 8070 8071 8072 8073 8074 8075 8076 8077 8078 8079 8080 8081 8082 8083 8084 8085 8086 8087 8088 8089 8090 8091 8092 8093 8094 8095 8096 8097 8098 8099 8100 8101 8102 8103 8104 8105 8106 8107 8108 8109 8110 8111 8112 8113 8114 8115 8116 8117 8118 8119 8120 8121 8122 8123 8124 8125 8126 8127 8128 8129 8130 8131 8132 8133 8134 8135 8136 8137 8138 8139 8140 8141 8142 8143 8144 8145 8146 8147 8148 8149 8150 8151 8152 8153 8154 8155 8156 8157 8158 8159 8160 8161 8162 8163 8164 8165 8166 8167 8168 8169 8170 8171 8172 8173 8174 8175 8176 8177 8178 8179 8180 8181 8182 8183 8184 8185 8186 8187 8188 8189 8190 8191 8192 8193 8194 8195 8196 8197 8198 8199 8200 8201 8202 8203 8204 8205 8206 8207 8208 8209 8210 8211 8212 8213 8214 8215 8216 8217 8218 8219 8220 8221 8222 8223 8224 8225 8226 8227 8228 8229 8230 8231 8232 8233 8234 8235 8236 8237 8238 8239 8240 8241 8242 8243 8244 8245 8246 8247 8248 8249 8250 8251 8252 8253 8254 8255 8256 8257 8258 8259 8260 8261 8262 8263 8264 8265 8266 8267 8268 8269 8270 8271 8272 8273 8274 8275 8276 8277 8278 8279 8280 8281 8282 8283 8284 8285 8286 8287 8288 8289 8290 8291 8292 8293 8294 8295 8296 8297 8298 8299 8300 8301 8302 8303 8304 8305 8306 8307 8308 8309 8310 8311 8312 8313 8314 8315 8316 8317 8318 8319 8320 8321 8322 8323 8324 8325 8326 8327 8328 8329 8330 8331 8332 8333 8334 8335 8336 8337 8338 8339 8340 8341 8342 8343 8344 8345 8346 8347 8348 8349 8350 8351 8352 8353 8354 8355 8356 8357 8358 8359 8360 8361 8362 8363 8364 8365 8366 8367 8368 8369 8370 8371 8372 8373 8374 8375 8376 8377 8378 8379 8380 8381 8382 8383 8384 8385 8386 8387 8388 8389 8390 8391 8392 8393 8394 8395 8396 8397 8398 8399 8400 8401 8402 8403 8404 8405 8406 8407 8408 8409 8410 8411 8412 8413 8414 8415 8416 8417 8418 8419 8420 8421 8422 8423 8424 8425 8426 8427 8428 8429 8430 8431 8432 8433 8434 8435 8436 8437 8438 8439 8440 8441 8442 8443 8444 8445 8446 8447 8448 8449 8450 8451 8452 8453 8454 8455 8456 8457 8458 8459 8460 8461 8462 8463 8464 8465 8466 8467 8468 8469 8470 8471 8472 8473 8474 8475 8476 8477 8478 8479 8480 8481 8482 8483 8484 8485 8486 8487 8488 8489 8490 8491 8492 8493 8494 8495 8496 8497 8498 8499 8500 8501 8502 8503 8504 8505 8506 8507 8508 8509 8510 8511 8512 8513 8514 8515 8516 8517 8518 8519 8520 8521 8522 8523 8524 8525 8526 8527 8528 8529 8530 8531 8532 8533 8534 8535 8536 8537 8538 8539 8540 8541 8542 8543 8544 8545 8546 8547 8548 8549 8550 8551 8552 8553 8554 8555 8556 8557 8558 8559 8560 8561 8562 8563 8564 8565 8566 8567 8568 8569 8570 8571 8572 8573 8574 8575 8576 8577 8578 8579 8580 8581 8582 8583 8584 8585 8586 8587 8588 8589 8590 8591 8592 8593 8594 8595 8596 8597 8598 8599 8600 8601 8602 8603 8604 8605 8606 8607 8608 8609 8610 8611 8612 8613 8614 8615 8616 8617 8618 8619 8620 8621 8622 8623 8624 8625 8626 8627 8628 8629 8630 8631 8632 8633 8634 8635 8636 8637 8638 8639 8640 8641 8642 8643 8644 8645 8646 8647 8648 8649 8650 8651 8652 8653 8654 8655 8656 8657 8658 8659 8660 8661 8662 8663 8664 8665 8666 8667 8668 8669 8670 8671 8672 8673 8674 8675 8676 8677 8678 8679 8680 8681 8682 8683 8684 8685 8686 8687 8688 8689 8690 8691 8692 8693 8694 8695 8696 8697 8698 8699 8700 8701 8702 8703 8704 8705 8706 8707 8708 8709 8710 8711 8712 8713 8714 8715 8716 8717 8718 8719 8720 8721 8722 8723 8724 8725 8726 8727 8728 8729 8730 8731 8732 8733 8734 8735 8736 8737 8738 8739 8740 8741 8742 8743 8744 8745 8746 8747 8748 8749 8750 8751 8752 8753 8754 8755 8756
    if (table->s->tmp_table != NO_TMP_TABLE) {
      retval = (get_disable_slow_alter(thd)) ? HA_ALTER_ERROR : HA_ALTER_NOT_SUPPORTED;
      goto cleanup;
    }
    if (!(are_null_bits_in_order(table) && 
          are_null_bits_in_order(altered_table)
          )
       ) 
    {
        sql_print_error("Problems parsing null bits of the original and altered table");
        retval = (get_disable_slow_alter(thd)) ? HA_ALTER_ERROR : HA_ALTER_NOT_SUPPORTED;
        goto cleanup;
    }
    if (has_added_columns && !has_non_added_changes) {
        u_int32_t added_columns[altered_table->s->fields];
        u_int32_t num_added_columns = 0;
        int r = find_changed_columns(
            added_columns,
            &num_added_columns,
            table,
            altered_table
            );
        if (r) {
            retval = (get_disable_slow_alter(thd)) ? HA_ALTER_ERROR : HA_ALTER_NOT_SUPPORTED;
            goto cleanup;
        }
        if (!columns_have_default_null_blobs(
            added_columns,
            num_added_columns,
            altered_table
            )) 
        {
            sql_print_error("unexpectedly, an added column has a non-null default");
            retval = HA_ALTER_ERROR;
            goto cleanup;
        }
        if (tokudb_debug & TOKUDB_DEBUG_ALTER_TABLE_INFO) {
            for (u_int32_t i = 0; i < num_added_columns; i++) {
                u_int32_t curr_added_index = added_columns[i];
                Field* curr_added_field = altered_table->field[curr_added_index];
                printf(
                    "Added column: index %d, name %s\n", 
                    curr_added_index, 
                    curr_added_field->field_name
                    );
            }
        }
    }
    if (has_dropped_columns && !has_non_dropped_changes) {
        u_int32_t dropped_columns[table->s->fields];
        u_int32_t num_dropped_columns = 0;
        int r = find_changed_columns(
            dropped_columns,
            &num_dropped_columns,
            altered_table,
            table
            );
        if (r) {
            retval = (get_disable_slow_alter(thd)) ? HA_ALTER_ERROR : HA_ALTER_NOT_SUPPORTED;
            goto cleanup;
        }
        if (tokudb_debug & TOKUDB_DEBUG_ALTER_TABLE_INFO) {
            for (u_int32_t i = 0; i < num_dropped_columns; i++) {
                u_int32_t curr_dropped_index = dropped_columns[i];
                Field* curr_dropped_field = table->field[curr_dropped_index];
                printf(
                    "Dropped column: index %d, name %s\n", 
                    curr_dropped_index, 
                    curr_dropped_field->field_name
                    );
            }
        }
    }
    
    if (has_indexing_changes && !has_non_indexing_changes) {
        retval = HA_ALTER_SUPPORTED_WAIT_LOCK;
    }
    else if (has_dropped_columns && !has_non_dropped_changes) {
        retval = HA_ALTER_SUPPORTED_WAIT_LOCK;
    }
    else if (has_added_columns && !has_non_added_changes) {
        retval = HA_ALTER_SUPPORTED_WAIT_LOCK;
    }
    else { 
        retval = (get_disable_slow_alter(thd)) ? HA_ALTER_ERROR : HA_ALTER_NOT_SUPPORTED;
    }
cleanup:
    DBUG_RETURN(retval);
}

#define UP_COL_ADD_OR_DROP 0

#define COL_DROP 0xaa
#define COL_ADD 0xbb

#define COL_FIXED 0xcc
#define COL_VAR 0xdd
#define COL_BLOB 0xee



#define STATIC_ROW_MUTATOR_SIZE 1+8+2+8+8+8

/*
how much space do I need for the mutators?
static stuff first:
1 - UP_COL_ADD_OR_DROP
8 - old null, new null
2 - old num_offset, new num_offset
8 - old fixed_field size, new fixed_field_size
8 - old and new length of offsets
8 - old and new starting null bit position
TOTAL: 27

dynamic stuff:
4 - number of columns
for each column:
1 - add or drop
1 - is nullable
4 - if nullable, position
1 - if add, whether default is null or not
1 - if fixed, var, or not
 for fixed, entire default
 for var, 4 bytes length, then entire default
 for blob, nothing
So, an upperbound is 4 + num_fields(12) + all default stuff

static blob stuff:
4 - num blobs
1 byte for each num blobs in old table
So, an upperbound is 4 + kc_info->num_blobs

dynamic blob stuff:
for each blob added:
1 - state if we are adding or dropping
4 - blob index
if add, 1 len bytes
 at most, 4 0's
So, upperbound is num_blobs(1+4+1+4) = num_columns*10
*/
u_int32_t fill_static_row_mutator(
    uchar* buf, 
    TABLE* orig_table,
    TABLE* altered_table,
    KEY_AND_COL_INFO* orig_kc_info,
    KEY_AND_COL_INFO* altered_kc_info,
    u_int32_t keynr
    ) 
{
    //
    // start packing extra
    //
    uchar* pos = buf;
    // says what the operation is
    pos[0] = UP_COL_ADD_OR_DROP;
    pos++;
    
    //
    // null byte information
    //
    memcpy(pos, &orig_table->s->null_bytes, sizeof(orig_table->s->null_bytes));
    pos += sizeof(orig_table->s->null_bytes);
    memcpy(pos, &altered_table->s->null_bytes, sizeof(orig_table->s->null_bytes));
    pos += sizeof(altered_table->s->null_bytes);
    
    //
    // num_offset_bytes
    //
    assert(orig_kc_info->num_offset_bytes <= 2);
    pos[0] = orig_kc_info->num_offset_bytes;
    pos++;
    assert(altered_kc_info->num_offset_bytes <= 2);
    pos[0] = altered_kc_info->num_offset_bytes;
    pos++;
    
    //
    // size of fixed fields
    //
    u_int32_t fixed_field_size = orig_kc_info->mcp_info[keynr].fixed_field_size;
    memcpy(pos, &fixed_field_size, sizeof(fixed_field_size));
    pos += sizeof(fixed_field_size);
    fixed_field_size = altered_kc_info->mcp_info[keynr].fixed_field_size;
    memcpy(pos, &fixed_field_size, sizeof(fixed_field_size));
    pos += sizeof(fixed_field_size);
    
    //
    // length of offsets
    //
    u_int32_t len_of_offsets = orig_kc_info->mcp_info[keynr].len_of_offsets;
    memcpy(pos, &len_of_offsets, sizeof(len_of_offsets));
    pos += sizeof(len_of_offsets);
    len_of_offsets = altered_kc_info->mcp_info[keynr].len_of_offsets;
    memcpy(pos, &len_of_offsets, sizeof(len_of_offsets));
    pos += sizeof(len_of_offsets);

    u_int32_t orig_start_null_pos = get_first_null_bit_pos(orig_table);
    memcpy(pos, &orig_start_null_pos, sizeof(orig_start_null_pos));
    pos += sizeof(orig_start_null_pos);
    u_int32_t altered_start_null_pos = get_first_null_bit_pos(altered_table);
    memcpy(pos, &altered_start_null_pos, sizeof(altered_start_null_pos));
    pos += sizeof(altered_start_null_pos);

    assert((pos-buf) == STATIC_ROW_MUTATOR_SIZE);
    return pos - buf;
}


u_int32_t fill_dynamic_row_mutator(
    uchar* buf,
    u_int32_t* columns, 
    u_int32_t num_columns,
    TABLE* src_table,
    KEY_AND_COL_INFO* src_kc_info,
    u_int32_t keynr,
    bool is_add,
    bool* out_has_blobs
    ) 
{
    uchar* pos = buf;
    bool has_blobs = false;
    u_int32_t cols = num_columns;
    memcpy(pos, &cols, sizeof(cols));
    pos += sizeof(cols);
    for (u_int32_t i = 0; i < num_columns; i++) {
        u_int32_t curr_index = columns[i];
        Field* curr_field = src_table->field[curr_index];
    
        pos[0] = is_add ? COL_ADD : COL_DROP;
        pos++;
        //
        // NULL bit information
        //
        bool is_null_default = false;
        bool nullable = curr_field->null_bit != 0;
        if (!nullable) {
            pos[0] = 0;
            pos++;
        }
        else {
            pos[0] = 1;
            pos++;
            // write position of null byte that is to be removed
            u_int32_t null_bit_position = get_overall_null_bit_position(src_table, curr_field);
            memcpy(pos, &null_bit_position, sizeof(null_bit_position));
            pos += sizeof(null_bit_position);
            //
            // if adding a column, write the value of the default null_bit
            //
            if (is_add) {
                is_null_default = is_overall_null_position_set(
                    src_table->s->default_values,
                    null_bit_position
                    );
                pos[0] = is_null_default ? 1 : 0;
                pos++;
            }
        }
        if (src_kc_info->field_lengths[curr_index] != 0) {
            // we have a fixed field being dropped
            // store the offset and the number of bytes
            pos[0] = COL_FIXED;
            pos++;
            //store the offset
            u_int32_t fixed_field_offset = src_kc_info->cp_info[keynr][curr_index].col_pack_val;
            memcpy(pos, &fixed_field_offset, sizeof(fixed_field_offset));
            pos += sizeof(fixed_field_offset);
            //store the number of bytes
            u_int32_t num_bytes = src_kc_info->field_lengths[curr_index];
            memcpy(pos, &num_bytes, sizeof(num_bytes));
            pos += sizeof(num_bytes);
            if (is_add && !is_null_default) {
                uint curr_field_offset = field_offset(curr_field, src_table);
                memcpy(
                    pos, 
                    src_table->s->default_values + curr_field_offset, 
                    num_bytes
                    );
                pos += num_bytes;
            }
        }
        else if (src_kc_info->length_bytes[curr_index] != 0) {
            pos[0] = COL_VAR;
            pos++;
            //store the index of the variable column
            u_int32_t var_field_index = src_kc_info->cp_info[keynr][curr_index].col_pack_val;
            memcpy(pos, &var_field_index, sizeof(var_field_index));
            pos += sizeof(var_field_index);
            if (is_add && !is_null_default) {
                uint curr_field_offset = field_offset(curr_field, src_table);
                u_int32_t len_bytes = src_kc_info->length_bytes[curr_index];
                u_int32_t data_length = get_var_data_length(
                    src_table->s->default_values + curr_field_offset,
                    len_bytes
                    );
                memcpy(pos, &data_length, sizeof(data_length));
                pos += sizeof(data_length);
                memcpy(
                    pos, 
                    src_table->s->default_values + curr_field_offset + len_bytes,
                    data_length
                    );
                pos += data_length;
            }
        }
        else {
            pos[0] = COL_BLOB;
            pos++;
            has_blobs = true;
        }
    }
    *out_has_blobs = has_blobs;
    return pos-buf;
}


u_int32_t fill_static_blob_row_mutator(
    uchar* buf,
    TABLE* src_table,
    KEY_AND_COL_INFO* src_kc_info
    ) 
{
    uchar* pos = buf;
    // copy number of blobs
    memcpy(pos, &src_kc_info->num_blobs, sizeof(src_kc_info->num_blobs));
    pos += sizeof(src_kc_info->num_blobs);
    // copy length bytes for each blob
    for (u_int32_t i = 0; i < src_kc_info->num_blobs; i++) {
        u_int32_t curr_field_index = src_kc_info->blob_fields[i]; 
        Field* field = src_table->field[curr_field_index];
        u_int32_t len_bytes = field->row_pack_length();
        assert(len_bytes <= 4);
        pos[0] = len_bytes;
        pos++;
    }
    
    return pos-buf;
}

u_int32_t fill_dynamic_blob_row_mutator(
    uchar* buf,
    u_int32_t* columns, 
    u_int32_t num_columns,
    TABLE* src_table,
    KEY_AND_COL_INFO* src_kc_info,
    bool is_add
    ) 
{
    uchar* pos = buf;
    for (u_int32_t i = 0; i < num_columns; i++) {
        u_int32_t curr_field_index = columns[i];
        Field* curr_field = src_table->field[curr_field_index];
        if (src_kc_info->field_lengths[curr_field_index] == 0 && 
            src_kc_info->length_bytes[curr_field_index]== 0
            ) 
        {
            // find out which blob it is
            u_int32_t blob_index = src_kc_info->num_blobs;
            for (u_int32_t j = 0; j < src_kc_info->num_blobs; j++) {
                if (curr_field_index  == src_kc_info->blob_fields[j]) {
                    blob_index = j;
                    break;
                }
            }
            // assert we found blob in list
            assert(blob_index < src_kc_info->num_blobs);
            pos[0] = is_add ? COL_ADD : COL_DROP;
            pos++;
            memcpy(pos, &blob_index, sizeof(blob_index));
            pos += sizeof(blob_index);
            if (is_add) {
                bool is_null_default = is_column_default_null(
                    src_table,
                    curr_field_index
                    );

                u_int32_t len_bytes = curr_field->row_pack_length();
                assert(len_bytes <= 4);
                pos[0] = len_bytes;
                pos++;

                if (is_null_default) {
                    // create a zero length blob field that can be directly copied in
                    bzero(pos,len_bytes);
                    pos += len_bytes;
                }
                else {
                    // in future, if is_null_default can be 0, we will have a default value placed here
                    // for now, in MySQL, we can only have blob fields that are null by default
                    // in check_if_supported_alter, we verify that all blob fields have null by default,
                    // so, we can assert this here.
                    assert(is_null_default);
                }
            }
        }
        else {
            // not a blob, continue
            continue;
        }
    }
    return pos-buf;
}

// TODO: carefully review to make sure that the right information is used
// TODO: namely, when do we get stuff from share->kc_info and when we get
// TODO: it from altered_kc_info, and when is keynr associated with the right thing
u_int32_t ha_tokudb::fill_row_mutator(
    uchar* buf, 
    u_int32_t* columns, 
    u_int32_t num_columns,
    TABLE* altered_table,
    KEY_AND_COL_INFO* altered_kc_info,
    u_int32_t keynr,
    bool is_add
    ) 
{
    if (tokudb_debug & TOKUDB_DEBUG_ALTER_TABLE_INFO) {
        printf("*****some info:*************\n");
        printf(
            "old things: num_null_bytes %d, num_offset_bytes %d, fixed_field_size %d, fixed_field_size %d\n",
            table->s->null_bytes,
            share->kc_info.num_offset_bytes,
            share->kc_info.mcp_info[keynr].fixed_field_size,
            share->kc_info.mcp_info[keynr].len_of_offsets
            );
        printf(
            "new things: num_null_bytes %d, num_offset_bytes %d, fixed_field_size %d, fixed_field_size %d\n",
            altered_table->s->null_bytes,
            altered_kc_info->num_offset_bytes,
            altered_kc_info->mcp_info[keynr].fixed_field_size,
            altered_kc_info->mcp_info[keynr].len_of_offsets
            );
        printf("****************************\n");
    }
    uchar* pos = buf;
    bool has_blobs = false;
    pos += fill_static_row_mutator(
        pos,
        table,
        altered_table,
        &share->kc_info,
        altered_kc_info,
        keynr
        );
    
    if (is_add) {
        pos += fill_dynamic_row_mutator(
            pos,
            columns,
            num_columns,
            altered_table,
            altered_kc_info,
            keynr,
            is_add,
            &has_blobs
            );
    }
    else {
        pos += fill_dynamic_row_mutator(
            pos,
            columns,
            num_columns,
            table,
            &share->kc_info,
            keynr,
            is_add,
            &has_blobs
            );
    }
    if (has_blobs) {
        pos += fill_static_blob_row_mutator(
            pos,
            table,
            &share->kc_info
            );
        if (is_add) {
            pos += fill_dynamic_blob_row_mutator(
                pos,
                columns,
                num_columns,
                altered_table,
                altered_kc_info,
                is_add
                );
        }
        else {
            pos += fill_dynamic_blob_row_mutator(
                pos,
                columns,
                num_columns,
                table,
                &share->kc_info,
                is_add
                );
        }
    }
    return pos-buf;
}

int ha_tokudb::alter_table_phase2(
    THD *thd,
    TABLE *altered_table,
    HA_CREATE_INFO *create_info,
    HA_ALTER_INFO *alter_info,
    HA_ALTER_FLAGS *alter_flags
    )
{
    TOKUDB_DBUG_ENTER("ha_tokudb::alter_table_phase2");
    int error;
    DB_TXN* txn = NULL;
    bool incremented_numDBs = false;
    bool modified_DBs = false;
    bool has_dropped_columns = alter_flags->is_set(HA_DROP_COLUMN);
    bool has_added_columns = alter_flags->is_set(HA_ADD_COLUMN);
    KEY_AND_COL_INFO altered_kc_info;
    bzero(&altered_kc_info, sizeof(altered_kc_info));
    u_int32_t max_new_desc_size = 0;
    uchar* row_desc_buff = NULL;
    uchar* column_extra = NULL; 
    bool dropping_indexes = alter_info->index_drop_count > 0 && !tables_have_same_keys(table,altered_table,false);
    bool adding_indexes = alter_info->index_add_count > 0 && !tables_have_same_keys(table,altered_table,false);
    tokudb_trx_data* trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);

    is_fast_alter_running = true;

    if (!trx || 
        (trx->all != NULL) || 
        (trx->sp_level != NULL) ||
        (trx->stmt == NULL) ||
        (trx->sub_sp_level != trx->stmt)
       )
    {
      error = HA_ERR_UNSUPPORTED;
      goto cleanup;
    }
    txn = trx->stmt;

    error = allocate_key_and_col_info(altered_table->s, &altered_kc_info);
    if (error) { goto cleanup; }

    max_new_desc_size = get_max_desc_size(&altered_kc_info, altered_table);
    row_desc_buff = (uchar *)my_malloc(max_new_desc_size, MYF(MY_WME));
    if (row_desc_buff == NULL){ error = ENOMEM; goto cleanup;}

    // drop indexes
    if (dropping_indexes) {
        error = drop_indexes(table, alter_info->index_drop_buffer, alter_info->index_drop_count, txn);
        if (error) { goto cleanup; }
    }

    // add indexes
    if (adding_indexes) {
        KEY           *key_info;
        KEY           *key;
        uint          *idx_p;
        uint          *idx_end_p;
        KEY_PART_INFO *key_part;
        KEY_PART_INFO *part_end;
        /* The add_index() method takes an array of KEY structs. */
        key_info= (KEY*) thd->alloc(sizeof(KEY) * alter_info->index_add_count);
        key= key_info;
        for (idx_p= alter_info->index_add_buffer, idx_end_p= idx_p + alter_info->index_add_count;
             idx_p < idx_end_p;
             idx_p++, key++)
        {
          /* Copy the KEY struct. */
          *key= alter_info->key_info_buffer[*idx_p];
          /* Fix the key parts. */
          part_end= key->key_part + key->key_parts;
          for (key_part= key->key_part; key_part < part_end; key_part++)
            key_part->field = table->field[key_part->fieldnr];
        }
        error = tokudb_add_index(
            table, 
            key_info,
            alter_info->index_add_count,
            txn,
            &incremented_numDBs,
            &modified_DBs
            );
        if (error) { 
            // hack for now, in case of duplicate key error, 
            // because at the moment we cannot display the right key
            // information to the user, so that he knows potentially what went
            // wrong.
            last_dup_key = MAX_KEY;
            goto cleanup;
        }
    }

    if (has_dropped_columns || has_added_columns) {
        DBT column_dbt;
        bzero(&column_dbt, sizeof(DBT));
        u_int32_t max_column_extra_size;
        u_int32_t num_column_extra;
        u_int32_t columns[table->s->fields + altered_table->s->fields]; // set size such that we know it is big enough for both cases
        u_int32_t num_columns = 0;
        u_int32_t curr_num_DBs = table->s->keys + test(hidden_primary_key);
        memset(columns, 0, sizeof(columns));

        if (has_added_columns && has_dropped_columns) {
            error = HA_ERR_UNSUPPORTED;
            goto cleanup;
        }
        if (!tables_have_same_keys(table, altered_table, true)) {
            error = HA_ERR_UNSUPPORTED;
            goto cleanup;
        }

        error = initialize_key_and_col_info(
            altered_table->s, 
            altered_table,
            &altered_kc_info,
            hidden_primary_key,
            primary_key
            );
        if (error) { goto cleanup; }

        // generate the array of columns
        if (has_dropped_columns) {
            find_changed_columns(
                columns,
                &num_columns,
                altered_table,
                table
                );
        }
        if (has_added_columns) {
            find_changed_columns(
                columns,
                &num_columns,
                table,
                altered_table
                );
        }
        max_column_extra_size = 
            STATIC_ROW_MUTATOR_SIZE + //max static row_mutator
            4 + num_columns*(1+1+4+1+1+4) + altered_table->s->reclength + // max dynamic row_mutator
            (4 + share->kc_info.num_blobs) + // max static blob size
            (num_columns*(1+4+1+4)); // max dynamic blob size
        column_extra = (uchar *)my_malloc(max_column_extra_size, MYF(MY_WME));
        if (column_extra == NULL) { error = ENOMEM; goto cleanup; }

        for (u_int32_t i = 0; i < curr_num_DBs; i++) {
            DBT row_descriptor;
            bzero(&row_descriptor, sizeof(row_descriptor));
            KEY* prim_key = (hidden_primary_key) ? NULL : &altered_table->s->key_info[primary_key];
            KEY* key_info = &altered_table->key_info[i];
            if (i == primary_key) {
                row_descriptor.size = create_main_key_descriptor(
                    row_desc_buff,
                    prim_key,
                    hidden_primary_key,
                    primary_key,
                    altered_table,
                    &altered_kc_info
                    );
                    row_descriptor.data = row_desc_buff;
            }
            else {
                row_descriptor.size = create_secondary_key_descriptor(
                    row_desc_buff,
                    key_info,
                    prim_key,
                    hidden_primary_key,
                    altered_table,
                    primary_key,
                    i,
                    &altered_kc_info
                    );
                row_descriptor.data = row_desc_buff;
            }
            error = share->key_file[i]->change_descriptor(
                share->key_file[i],
                txn,
                &row_descriptor,
                0
                );
            if (error) { goto cleanup; }
            
            if (i == primary_key || table_share->key_info[i].flags & HA_CLUSTERING) {
                num_column_extra = fill_row_mutator(
                    column_extra,
                    columns,
                    num_columns,
                    altered_table,
                    &altered_kc_info,
                    i,
                    has_added_columns // true if adding columns, otherwise is a drop
                    );
                
                column_dbt.data = column_extra;
                column_dbt.size = num_column_extra;
                DBUG_ASSERT(num_column_extra <= max_column_extra_size);
                
                error = share->key_file[i]->update_broadcast(
                    share->key_file[i],
                    txn,
                    &column_dbt,
                    DB_IS_RESETTING_OP
                    );
                if (error) { goto cleanup; }
            }
        }
    }
8757 8758 8759 8760 8761 8762 8763

    // update frm file    
    // only for tables that are not partitioned
    if (altered_table->part_info == NULL) {
        error = write_frm_data(share->status_block, txn, altered_table->s->path.str);
        if (error) { goto cleanup; }
    }    
8764 8765 8766 8767 8768 8769 8770 8771 8772 8773 8774 8775 8776 8777 8778 8779 8780 8781 8782 8783 8784 8785 8786 8787 8788 8789 8790 8791 8792 8793 8794 8795 8796 8797 8798 8799 8800 8801 8802 8803 8804 8805 8806 8807 8808 8809 8810 8811 8812 8813 8814 8815 8816 8817 8818 8819 8820 8821 8822 8823 8824 8825 8826 8827 8828 8829 8830 8831 8832 8833 8834 8835 8836 8837 8838 8839 8840 8841 8842 8843 8844 8845 8846 8847 8848 8849 8850 8851 8852 8853 8854 8855 8856 8857 8858 8859 8860 8861 8862 8863 8864 8865 8866 8867 8868 8869 8870 8871 8872 8873 8874 8875 8876 8877 8878 8879 8880 8881 8882 8883 8884 8885 8886 8887 8888 8889 8890 8891 8892 8893 8894 8895 8896 8897 8898 8899 8900 8901 8902 8903 8904 8905 8906 8907 8908 8909 8910 8911 8912 8913 8914 8915 8916 8917 8918 8919 8920 8921 8922 8923 8924 8925 8926 8927 8928 8929 8930 8931 8932 8933 8934 8935 8936 8937 8938 8939 8940 8941 8942 8943 8944 8945 8946 8947 8948 8949 8950 8951 8952 8953 8954 8955 8956 8957 8958 8959 8960 8961 8962 8963 8964 8965 8966 8967 8968 8969 8970 8971 8972 8973 8974 8975 8976 8977 8978 8979 8980 8981 8982 8983 8984 8985 8986 8987 8988 8989 8990 8991 8992 8993 8994 8995 8996 8997 8998 8999 9000 9001 9002 9003 9004 9005 9006 9007 9008 9009 9010 9011 9012 9013 9014 9015 9016 9017 9018 9019 9020 9021 9022 9023 9024 9025 9026 9027 9028 9029 9030 9031 9032 9033 9034 9035 9036 9037 9038 9039 9040 9041 9042 9043 9044 9045 9046 9047 9048 9049 9050 9051 9052 9053 9054 9055 9056 9057 9058 9059 9060 9061 9062 9063 9064 9065 9066 9067 9068 9069 9070 9071 9072 9073 9074 9075 9076 9077 9078 9079 9080 9081 9082 9083 9084 9085 9086 9087 9088 9089 9090 9091 9092 9093 9094 9095 9096 9097 9098 9099 9100 9101 9102 9103 9104 9105 9106 9107 9108 9109 9110 9111 9112 9113 9114 9115 9116 9117 9118 9119 9120 9121 9122 9123 9124 9125 9126 9127 9128 9129 9130 9131 9132 9133 9134 9135 9136 9137 9138 9139 9140 9141 9142 9143 9144 9145 9146 9147 9148 9149 9150 9151 9152 9153 9154 9155 9156 9157 9158 9159 9160 9161 9162 9163 9164 9165 9166 9167 9168 9169 9170 9171 9172 9173 9174 9175 9176 9177 9178 9179 9180 9181 9182 9183 9184 9185 9186 9187 9188 9189 9190 9191 9192 9193 9194 9195 9196 9197 9198 9199 9200 9201 9202 9203 9204 9205 9206 9207 9208 9209 9210 9211 9212 9213 9214 9215 9216 9217 9218 9219 9220 9221 9222 9223 9224 9225 9226 9227 9228 9229 9230 9231 9232 9233 9234 9235 9236 9237 9238 9239 9240 9241 9242 9243 9244 9245 9246 9247 9248 9249 9250 9251 9252 9253 9254 9255 9256 9257 9258 9259 9260 9261 9262 9263 9264 9265 9266 9267 9268 9269 9270 9271 9272 9273 9274 9275 9276 9277 9278 9279 9280 9281 9282 9283 9284 9285 9286 9287 9288 9289 9290 9291 9292 9293 9294 9295 9296 9297
    if (thd->killed) {
        error = ER_ABORTING_CONNECTION;
        goto cleanup;
    }

    error = 0;    
cleanup:
    free_key_and_col_info(&altered_kc_info);
    my_free(row_desc_buff, MYF(MY_ALLOW_ZERO_PTR));
    my_free(column_extra, MYF(MY_ALLOW_ZERO_PTR));
    if (txn) {
        if (error) {
            if (adding_indexes) {
                restore_add_index(table, alter_info->index_add_count, incremented_numDBs, modified_DBs);
            }
            abort_txn(txn);
            trx->stmt = NULL;
            trx->sub_sp_level = NULL;
            if (dropping_indexes) {
                restore_drop_indexes(table, alter_info->index_drop_buffer, alter_info->index_drop_count);
            }
        }
    }
    TOKUDB_DBUG_RETURN(error);
}

inline void copy_null_bits(
    u_int32_t start_old_pos,
    u_int32_t start_new_pos,
    u_int32_t num_bits,
    uchar* old_null_bytes,
    uchar* new_null_bytes
    ) 
{
    for (u_int32_t i = 0; i < num_bits; i++) {
        u_int32_t curr_old_pos = i + start_old_pos;
        u_int32_t curr_new_pos = i + start_new_pos;
        // copy over old null bytes
        if (is_overall_null_position_set(old_null_bytes,curr_old_pos)) {
            set_overall_null_position(new_null_bytes,curr_new_pos,true);
        }
        else {
            set_overall_null_position(new_null_bytes,curr_new_pos,false);
        }
    }
}

inline void copy_var_fields(
    u_int32_t start_old_num_var_field, //index of var fields that we should start writing
    u_int32_t num_var_fields, // number of var fields to copy
    uchar* old_var_field_offset_ptr, //static ptr to where offset bytes begin in old row
    uchar old_num_offset_bytes, //number of offset bytes used in old row
    uchar* start_new_var_field_data_ptr, // where the new var data should be written
    uchar* start_new_var_field_offset_ptr, // where the new var offsets should be written
    uchar* new_var_field_data_ptr, // pointer to beginning of var fields in new row
    uchar* old_var_field_data_ptr, // pointer to beginning of var fields in old row
    u_int32_t new_num_offset_bytes, // number of offset bytes used in new row
    u_int32_t* num_data_bytes_written,
    u_int32_t* num_offset_bytes_written
    ) 
{
    uchar* curr_new_var_field_data_ptr = start_new_var_field_data_ptr;
    uchar* curr_new_var_field_offset_ptr = start_new_var_field_offset_ptr;
    for (u_int32_t i = 0; i < num_var_fields; i++) {
        u_int32_t field_len;
        u_int32_t start_read_offset;
        u_int32_t curr_old = i + start_old_num_var_field;
        uchar* data_to_copy = NULL;
        // get the length and pointer to data that needs to be copied
        get_var_field_info(
            &field_len, 
            &start_read_offset, 
            curr_old, 
            old_var_field_offset_ptr, 
            old_num_offset_bytes
            );
        data_to_copy = old_var_field_data_ptr + start_read_offset;
        // now need to copy field_len bytes starting from data_to_copy
        curr_new_var_field_data_ptr = write_var_field(
            curr_new_var_field_offset_ptr,
            curr_new_var_field_data_ptr,
            new_var_field_data_ptr,
            data_to_copy,
            field_len,
            new_num_offset_bytes
            );
        curr_new_var_field_offset_ptr += new_num_offset_bytes;
    }
    *num_data_bytes_written = (u_int32_t)(curr_new_var_field_data_ptr - start_new_var_field_data_ptr);
    *num_offset_bytes_written = (u_int32_t)(curr_new_var_field_offset_ptr - start_new_var_field_offset_ptr);
}

inline u_int32_t copy_toku_blob(uchar* to_ptr, uchar* from_ptr, u_int32_t len_bytes, bool skip) {
    u_int32_t length = 0;
    if (!skip) {
        memcpy(to_ptr, from_ptr, len_bytes);
    }
    length = get_blob_field_len(from_ptr,len_bytes);
    if (!skip) {
        memcpy(to_ptr + len_bytes, from_ptr + len_bytes, length);
    }
    return (length + len_bytes);
}

int tokudb_update_fun(
    DB* db,
    const DBT *key,
    const DBT *old_val, 
    const DBT *extra,
    void (*set_val)(const DBT *new_val, void *set_extra),
    void *set_extra
    ) 
{
    u_int32_t max_num_bytes;
    u_int32_t num_columns;
    DBT new_val;
    u_int32_t num_bytes_left;
    u_int32_t num_var_fields_to_copy;
    u_int32_t num_data_bytes_written = 0;
    u_int32_t num_offset_bytes_written = 0;
    int error;
    bzero(&new_val, sizeof(DBT));
    uchar operation;
    uchar* new_val_data = NULL;
    uchar* extra_pos = NULL;
    uchar* extra_pos_start = NULL;
    //
    // info for pointers into rows
    //
    u_int32_t old_num_null_bytes;
    u_int32_t new_num_null_bytes;
    uchar old_num_offset_bytes;
    uchar new_num_offset_bytes;
    u_int32_t old_fixed_field_size;
    u_int32_t new_fixed_field_size;
    u_int32_t old_len_of_offsets;
    u_int32_t new_len_of_offsets;

    uchar* old_fixed_field_ptr = NULL;
    uchar* new_fixed_field_ptr = NULL;
    u_int32_t curr_old_fixed_offset;
    u_int32_t curr_new_fixed_offset;

    uchar* old_null_bytes = NULL;
    uchar* new_null_bytes = NULL;
    u_int32_t curr_old_null_pos;
    u_int32_t curr_new_null_pos;    
    u_int32_t old_null_bits_left;
    u_int32_t new_null_bits_left;
    u_int32_t overall_null_bits_left;

    u_int32_t old_num_var_fields;
    u_int32_t new_num_var_fields;
    u_int32_t curr_old_num_var_field;
    u_int32_t curr_new_num_var_field;
    uchar* old_var_field_offset_ptr = NULL;
    uchar* new_var_field_offset_ptr = NULL;
    uchar* curr_new_var_field_offset_ptr = NULL;
    uchar* old_var_field_data_ptr = NULL;
    uchar* new_var_field_data_ptr = NULL;
    uchar* curr_new_var_field_data_ptr = NULL;

    u_int32_t start_blob_offset;
    uchar* start_blob_ptr;
    u_int32_t num_blob_bytes;

    // came across a delete, nothing to update
    if (old_val == NULL) {
        error = 0;
        goto cleanup;
    }

    extra_pos_start = (uchar *)extra->data;
    extra_pos = (uchar *)extra->data;

    operation = extra_pos[0];
    extra_pos++;
    assert(operation == UP_COL_ADD_OR_DROP);

    memcpy(&old_num_null_bytes, extra_pos, sizeof(u_int32_t));
    extra_pos += sizeof(u_int32_t);
    memcpy(&new_num_null_bytes, extra_pos, sizeof(u_int32_t));
    extra_pos += sizeof(u_int32_t);

    old_num_offset_bytes = extra_pos[0];
    extra_pos++;
    new_num_offset_bytes = extra_pos[0];
    extra_pos++;

    memcpy(&old_fixed_field_size, extra_pos, sizeof(u_int32_t));
    extra_pos += sizeof(u_int32_t);
    memcpy(&new_fixed_field_size, extra_pos, sizeof(u_int32_t));
    extra_pos += sizeof(u_int32_t);

    memcpy(&old_len_of_offsets, extra_pos, sizeof(u_int32_t));
    extra_pos += sizeof(u_int32_t);
    memcpy(&new_len_of_offsets, extra_pos, sizeof(u_int32_t));
    extra_pos += sizeof(u_int32_t);

    max_num_bytes = old_val->size + extra->size + new_len_of_offsets + new_fixed_field_size;
    new_val_data = (uchar *)my_malloc(
        max_num_bytes, 
        MYF(MY_FAE)
        );
    if (new_val_data == NULL) { goto cleanup; }

    old_fixed_field_ptr = (uchar *) old_val->data;
    old_fixed_field_ptr += old_num_null_bytes;
    new_fixed_field_ptr = new_val_data + new_num_null_bytes;
    curr_old_fixed_offset = 0;
    curr_new_fixed_offset = 0;

    old_num_var_fields = old_len_of_offsets/old_num_offset_bytes;
    new_num_var_fields = new_len_of_offsets/new_num_offset_bytes;
    // following fields will change as we write the variable data
    old_var_field_offset_ptr = old_fixed_field_ptr + old_fixed_field_size;
    new_var_field_offset_ptr = new_fixed_field_ptr + new_fixed_field_size;
    old_var_field_data_ptr = old_var_field_offset_ptr + old_len_of_offsets;
    new_var_field_data_ptr = new_var_field_offset_ptr + new_len_of_offsets;
    curr_new_var_field_offset_ptr = new_var_field_offset_ptr;
    curr_new_var_field_data_ptr = new_var_field_data_ptr;
    curr_old_num_var_field = 0;
    curr_new_num_var_field = 0;

    old_null_bytes = (uchar *)old_val->data;
    new_null_bytes = new_val_data;

    
    memcpy(&curr_old_null_pos, extra_pos, sizeof(u_int32_t));
    extra_pos += sizeof(u_int32_t);
    memcpy(&curr_new_null_pos, extra_pos, sizeof(u_int32_t));
    extra_pos += sizeof(u_int32_t);

    memcpy(&num_columns, extra_pos, sizeof(num_columns));
    extra_pos += sizeof(num_columns);
    
    //
    // now go through and apply the change into new_val_data
    //
    for (u_int32_t i = 0; i < num_columns; i++) {
        uchar op_type = extra_pos[0];
        bool is_null_default = false;
        extra_pos++;

        assert(op_type == COL_DROP || op_type == COL_ADD);
        bool nullable = (extra_pos[0] != 0);
        extra_pos++;
        if (nullable) {
            u_int32_t null_bit_position;
            memcpy(&null_bit_position, extra_pos, sizeof(u_int32_t));
            extra_pos += sizeof(u_int32_t);
            u_int32_t num_bits;
            if (op_type == COL_DROP) {
                assert(curr_old_null_pos <= null_bit_position);
                num_bits = null_bit_position - curr_old_null_pos;
            }
            else {
                assert(curr_new_null_pos <= null_bit_position);
                num_bits = null_bit_position - curr_new_null_pos;
            }
            copy_null_bits(
                curr_old_null_pos,
                curr_new_null_pos,
                num_bits,
                old_null_bytes,
                new_null_bytes
                );
            // update the positions
            curr_new_null_pos += num_bits;
            curr_old_null_pos += num_bits;
            if (op_type == COL_DROP) {
                curr_old_null_pos++; // account for dropped column
            }
            else {
                is_null_default = (extra_pos[0] != 0);
                extra_pos++;
                set_overall_null_position(
                    new_null_bytes,
                    null_bit_position,
                    is_null_default
                    );
                curr_new_null_pos++; //account for added column
            }
        }
        uchar col_type = extra_pos[0];
        extra_pos++;
        if (col_type == COL_FIXED) {
            u_int32_t col_offset;
            u_int32_t col_size;
            u_int32_t num_bytes_to_copy;
            memcpy(&col_offset, extra_pos, sizeof(u_int32_t));
            extra_pos += sizeof(u_int32_t);
            memcpy(&col_size, extra_pos, sizeof(u_int32_t));
            extra_pos += sizeof(u_int32_t);

            if (op_type == COL_DROP) {
                num_bytes_to_copy = col_offset - curr_old_fixed_offset;
            }
            else {
                num_bytes_to_copy = col_offset - curr_new_fixed_offset;
            }
            memcpy(
                new_fixed_field_ptr + curr_new_fixed_offset,
                old_fixed_field_ptr + curr_old_fixed_offset, 
                num_bytes_to_copy
                );
            curr_old_fixed_offset += num_bytes_to_copy;
            curr_new_fixed_offset += num_bytes_to_copy;
            if (op_type == COL_DROP) {
                // move old_fixed_offset val to skip OVER column that is being dropped
                curr_old_fixed_offset += col_size;
            }
            else {
                if (is_null_default) {
                    // copy zeroes
                    bzero(new_fixed_field_ptr + curr_new_fixed_offset, col_size);
                }
                else {
                    // copy data from extra_pos into new row
                    memcpy(
                        new_fixed_field_ptr + curr_new_fixed_offset,
                        extra_pos,
                        col_size
                        );
                    extra_pos += col_size;
                }
                curr_new_fixed_offset += col_size;
            }
            
        }
        else if (col_type == COL_VAR) {
            u_int32_t var_col_index;
            memcpy(&var_col_index, extra_pos, sizeof(u_int32_t));
            extra_pos += sizeof(u_int32_t);
            if (op_type == COL_DROP) {
                num_var_fields_to_copy = var_col_index - curr_old_num_var_field;
            }
            else {
                num_var_fields_to_copy = var_col_index - curr_new_num_var_field;
            }
            copy_var_fields(
                curr_old_num_var_field,
                num_var_fields_to_copy,
                old_var_field_offset_ptr,
                old_num_offset_bytes,
                curr_new_var_field_data_ptr,
                curr_new_var_field_offset_ptr,
                new_var_field_data_ptr, // pointer to beginning of var fields in new row
                old_var_field_data_ptr, // pointer to beginning of var fields in old row
                new_num_offset_bytes, // number of offset bytes used in new row
                &num_data_bytes_written,
                &num_offset_bytes_written
                );
            curr_new_var_field_data_ptr += num_data_bytes_written;
            curr_new_var_field_offset_ptr += num_offset_bytes_written;
            curr_new_num_var_field += num_var_fields_to_copy;
            curr_old_num_var_field += num_var_fields_to_copy;
            if (op_type == COL_DROP) {
                curr_old_num_var_field++; // skip over dropped field
            }
            else {
                if (is_null_default) {
                    curr_new_var_field_data_ptr = write_var_field(
                        curr_new_var_field_offset_ptr,
                        curr_new_var_field_data_ptr,
                        new_var_field_data_ptr,
                        NULL, //copying no data
                        0, //copying 0 bytes
                        new_num_offset_bytes
                        );
                    curr_new_var_field_offset_ptr += new_num_offset_bytes;
                }
                else {
                    u_int32_t data_length;
                    memcpy(&data_length, extra_pos, sizeof(data_length));
                    extra_pos += sizeof(data_length);
                    curr_new_var_field_data_ptr = write_var_field(
                        curr_new_var_field_offset_ptr,
                        curr_new_var_field_data_ptr,
                        new_var_field_data_ptr,
                        extra_pos, //copying data from mutator
                        data_length, //copying data_length bytes
                        new_num_offset_bytes
                        );
                    extra_pos += data_length;
                    curr_new_var_field_offset_ptr += new_num_offset_bytes;
                }
                curr_new_num_var_field++; //account for added column
            }
        }
        else if (col_type == COL_BLOB) {
            // handle blob data later
            continue;
        }
        else {
            assert(false);
        }
    }
    // finish copying the null stuff
    old_null_bits_left = 8*old_num_null_bytes - curr_old_null_pos;
    new_null_bits_left = 8*new_num_null_bytes - curr_new_null_pos;
    overall_null_bits_left = old_null_bits_left;
    set_if_smaller(overall_null_bits_left, new_null_bits_left);
    copy_null_bits(
        curr_old_null_pos,
        curr_new_null_pos,
        overall_null_bits_left,
        old_null_bytes,
        new_null_bytes
        );
    // finish copying fixed field stuff
    num_bytes_left = old_fixed_field_size - curr_old_fixed_offset;
    memcpy(
        new_fixed_field_ptr + curr_new_fixed_offset,
        old_fixed_field_ptr + curr_old_fixed_offset, 
        num_bytes_left
        );
    curr_old_fixed_offset += num_bytes_left;
    curr_new_fixed_offset += num_bytes_left;
    // sanity check
    assert(curr_new_fixed_offset == new_fixed_field_size);

    // finish copying var field stuff
    num_var_fields_to_copy = old_num_var_fields - curr_old_num_var_field;
    copy_var_fields(
        curr_old_num_var_field,
        num_var_fields_to_copy,
        old_var_field_offset_ptr,
        old_num_offset_bytes,
        curr_new_var_field_data_ptr,
        curr_new_var_field_offset_ptr,
        new_var_field_data_ptr, // pointer to beginning of var fields in new row
        old_var_field_data_ptr, // pointer to beginning of var fields in old row
        new_num_offset_bytes, // number of offset bytes used in new row
        &num_data_bytes_written,
        &num_offset_bytes_written
        );
    curr_new_var_field_offset_ptr += num_offset_bytes_written;
    curr_new_var_field_data_ptr += num_data_bytes_written;
    // sanity check
    assert(curr_new_var_field_offset_ptr == new_var_field_data_ptr);

    // start handling blobs
    get_blob_field_info(
        &start_blob_offset, 
        old_len_of_offsets,
        old_var_field_data_ptr,
        old_num_offset_bytes
        );
    start_blob_ptr = old_var_field_data_ptr + start_blob_offset;
    // if nothing else in extra, then there are no blobs to add or drop, so can copy blobs straight
    if ((extra_pos - extra_pos_start) == extra->size) {
        num_blob_bytes = old_val->size - (start_blob_ptr - old_null_bytes);
        memcpy(curr_new_var_field_data_ptr, start_blob_ptr, num_blob_bytes);
        curr_new_var_field_data_ptr += num_blob_bytes;
    }
    // else, there is blob information to process
    else {
        uchar* len_bytes = NULL;
        u_int32_t curr_old_blob = 0;
        u_int32_t curr_new_blob = 0;
        u_int32_t num_old_blobs = 0;
        uchar* curr_old_blob_ptr = start_blob_ptr;
        memcpy(&num_old_blobs, extra_pos, sizeof(num_old_blobs));
        extra_pos += sizeof(num_old_blobs);
        len_bytes = extra_pos;
        extra_pos += num_old_blobs;
        // copy over blob fields one by one
        while ((extra_pos - extra_pos_start) < extra->size) {
            uchar op_type = extra_pos[0];
            extra_pos++;
            u_int32_t num_blobs_to_copy = 0;
            u_int32_t blob_index;
            memcpy(&blob_index, extra_pos, sizeof(blob_index));
            extra_pos += sizeof(blob_index);
            assert (op_type == COL_DROP || op_type == COL_ADD);
            if (op_type == COL_DROP) {
                num_blobs_to_copy = blob_index - curr_old_blob;
            }
            else {
                num_blobs_to_copy = blob_index - curr_new_blob;
            }
            for (u_int32_t i = 0; i < num_blobs_to_copy; i++) {
                u_int32_t num_bytes_written = copy_toku_blob(
                    curr_new_var_field_data_ptr,
                    curr_old_blob_ptr,
                    len_bytes[curr_old_blob + i],
                    false
                    );
                curr_old_blob_ptr += num_bytes_written;
                curr_new_var_field_data_ptr += num_bytes_written;
            }
            curr_old_blob += num_blobs_to_copy;
            curr_new_blob += num_blobs_to_copy;
            if (op_type == COL_DROP) {
                // skip over blob in row
                u_int32_t num_bytes = copy_toku_blob(
                    NULL,
                    curr_old_blob_ptr,
                    len_bytes[curr_old_blob],
                    true
                    );
                curr_old_blob++;
                curr_old_blob_ptr += num_bytes;
            }
            else {
                // copy new data
                u_int32_t new_len_bytes = extra_pos[0];
                extra_pos++;
                u_int32_t num_bytes = copy_toku_blob(
                    curr_new_var_field_data_ptr,
                    extra_pos,
                    new_len_bytes,
                    false
                    );
                curr_new_blob++;
                curr_new_var_field_data_ptr += num_bytes;
                extra_pos += num_bytes;
            }                
        }
        num_blob_bytes = old_val->size - (curr_old_blob_ptr - old_null_bytes);
        memcpy(curr_new_var_field_data_ptr, curr_old_blob_ptr, num_blob_bytes);
        curr_new_var_field_data_ptr += num_blob_bytes;
    }
    new_val.data = new_val_data;
    new_val.size = curr_new_var_field_data_ptr - new_val_data;
    set_val(&new_val, set_extra);
    
    error = 0;
cleanup:
    my_free(new_val_data, MYF(MY_ALLOW_ZERO_PTR));
    return error;    
}

9298 9299
#endif

9300 9301 9302 9303 9304 9305 9306 9307 9308 9309 9310 9311 9312 9313
struct check_context {
    THD *thd;
};

static int
ha_tokudb_check_progress(void *extra, float progress) {
    struct check_context *context = (struct check_context *) extra;
    int result = 0;
    if (context->thd->killed)
        result = ER_ABORTING_CONNECTION;
    return result;
}

static void
9314
ha_tokudb_check_info(THD *thd, TABLE *table, const char *msg) {
9315
    if (thd->vio_ok()) {
9316 9317
        char tablename[256];
        snprintf(tablename, sizeof tablename, "%s.%s", table->s->db.str, table->s->table_name.str);
9318 9319 9320 9321 9322 9323 9324 9325 9326 9327 9328 9329 9330 9331 9332 9333 9334 9335 9336 9337 9338 9339 9340 9341 9342 9343 9344 9345 9346 9347 9348 9349 9350 9351 9352 9353 9354 9355
        thd->protocol->prepare_for_resend();
        thd->protocol->store(tablename, strlen(tablename), system_charset_info);
        thd->protocol->store("check", 5, system_charset_info);
        thd->protocol->store("info", 4, system_charset_info);
        thd->protocol->store(msg, strlen(msg), system_charset_info);
        thd->protocol->write();
    }
}

static volatile int tokudb_check_stall = 0; // debug

int
ha_tokudb::check(THD *thd, HA_CHECK_OPT *check_opt) {
    TOKUDB_DBUG_ENTER("check");
    const char *old_proc_info = thd->proc_info;
    thd_proc_info(thd, "tokudb::check");

    while (tokudb_check_stall) sleep(1); // debug

    int result = HA_ADMIN_OK;
    int r;

    int verbose = 0;
    int keep_going = 1;

    if (check_opt->flags & T_QUICK) {
        keep_going = 0;
    }
    if (check_opt->flags & T_EXTEND) {
        verbose = 1;
        keep_going = 1;
    }

    r = acquire_table_lock(transaction, lock_write);
    if (r != 0)
        result = HA_ADMIN_INTERNAL_ERROR;
    if (result == HA_ADMIN_OK) {
        uint32_t num_DBs = table_share->keys + test(hidden_primary_key);
9356 9357
        time_t now;
        char timebuf[32];
9358
        snprintf(write_status_msg, sizeof write_status_msg, "%s primary=%d num=%d", share->table_name, primary_key, num_DBs);
9359 9360 9361
        ha_tokudb_check_info(thd, table, write_status_msg);
        if (verbose) {
            now = time(0);
9362
            fprintf(stderr, "%.24s ha_tokudb::check %s\n", ctime_r(&now, timebuf), write_status_msg);
9363
        }
9364 9365 9366 9367 9368
        for (uint i = 0; i < num_DBs; i++) {
            time_t now;
            DB *db = share->key_file[i];
            const char *kname = table_share->key_info[i].name;
            if (i == primary_key)
9369
                kname = "primary"; // hidden primary key does not set name
9370
            snprintf(write_status_msg, sizeof write_status_msg, "%s key=%s %u", share->table_name, kname, i);
9371
            thd_proc_info(thd, write_status_msg);
9372 9373 9374
            ha_tokudb_check_info(thd, table, write_status_msg);
            if (verbose) {
                now = time(0);
9375
                fprintf(stderr, "%.24s ha_tokudb::check %s\n", ctime_r(&now, timebuf), write_status_msg);
9376
            }
9377 9378
            struct check_context check_context = { thd };
            r = db->verify_with_progress(db, ha_tokudb_check_progress, &check_context, verbose, keep_going);
9379
            snprintf(write_status_msg, sizeof write_status_msg, "%s key=%s %u result=%d", share->table_name, kname, i, r);
9380
            thd_proc_info(thd, write_status_msg);
9381 9382 9383
            ha_tokudb_check_info(thd, table, write_status_msg);
            if (verbose) {
                now = time(0);
9384
                fprintf(stderr, "%.24s ha_tokudb::check %s\n", ctime_r(&now, timebuf), write_status_msg);
9385
            }
9386 9387 9388 9389 9390 9391 9392
            if (result == HA_ADMIN_OK && r != 0)
                result = HA_ADMIN_CORRUPT;
        }
    }
    thd_proc_info(thd, old_proc_info);
    TOKUDB_DBUG_RETURN(result);
}