table.cc 95.7 KB
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/* Some general useful functions */

#include "mysql_priv.h"
#include <errno.h>
#include <m_ctype.h>
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#include "md5.h"
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	/* Functions defined in this file */

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void open_table_error(TABLE_SHARE *share, int error, int db_errno,
                      myf errortype, int errarg);
static int open_binary_frm(THD *thd, TABLE_SHARE *share, uchar *head,
                           File file);
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static void fix_type_pointers(const char ***array, TYPELIB *point_to_type,
			      uint types, char **names);
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static uint find_field(Field **fields, uint start, uint length);
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/* Get column name from column hash */

static byte *get_field_name(Field **buff, uint *length,
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			    my_bool not_used __attribute__((unused)))
{
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  *length= (uint) strlen((*buff)->field_name);
  return (byte*) (*buff)->field_name;
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}

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/*
  Allocate a setup TABLE_SHARE structure

  SYNOPSIS
    alloc_table_share()
    TABLE_LIST		Take database and table name from there
    key			Table cache key (db \0 table_name \0...)
    key_length		Length of key

  RETURN
    0  Error (out of memory)
    #  Share
*/

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TABLE_SHARE *alloc_table_share(TABLE_LIST *table_list, char *key,
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                               uint key_length)
{
  MEM_ROOT mem_root;
  TABLE_SHARE *share;
  char path[FN_REFLEN], normalized_path[FN_REFLEN];
  uint path_length, normalized_length;

  path_length= (uint) (strxmov(path, mysql_data_home, "/", table_list->db,
                               "/", table_list->table_name, NullS) - path);
  normalized_length= unpack_filename(normalized_path, path);

  init_sql_alloc(&mem_root, TABLE_ALLOC_BLOCK_SIZE, 0);
  if ((share= (TABLE_SHARE*) alloc_root(&mem_root,
					sizeof(*share) + key_length +
                                        path_length + normalized_length +2)))
  {
    bzero((char*) share, sizeof(*share));
    share->table_cache_key.str=    (char*) (share+1);
    share->table_cache_key.length= key_length;
    memcpy(share->table_cache_key.str, key, key_length);

    /* Use the fact the key is db/0/table_name/0 */
    share->db.str=            share->table_cache_key.str;
    share->db.length=         strlen(share->db.str);
    share->table_name.str=    share->db.str + share->db.length + 1;
    share->table_name.length= strlen(share->table_name.str);

    share->path.str= share->table_cache_key.str+ key_length;
    share->path.length= path_length;
    strmov(share->path.str, path);
    share->normalized_path.str=    share->path.str+ path_length+1;
    share->normalized_path.length= normalized_length;
    strmov(share->normalized_path.str, normalized_path);

    share->version=       refresh_version;
    share->flush_version= flush_version;

    memcpy((char*) &share->mem_root, (char*) &mem_root, sizeof(mem_root));
    pthread_mutex_init(&share->mutex, MY_MUTEX_INIT_FAST);
    pthread_cond_init(&share->cond, NULL);
  }
  return share;
}


/*
  Initialize share for temporary tables

  SYNOPSIS
    init_tmp_table_share()
    share	Share to fill
    key		Table_cache_key, as generated from create_table_def_key.
		must start with db name.    
    key_length	Length of key
    table_name	Table name
    path	Path to file (possible in lower case) without .frm

  NOTES
    This is different from alloc_table_share() because temporary tables
    don't have to be shared between threads or put into the table def
    cache, so we can do some things notable simpler and faster

    If table is not put in thd->temporary_tables (happens only when
    one uses OPEN TEMPORARY) then one can specify 'db' as key and
    use key_length= 0 as neither table_cache_key or key_length will be used).
*/

void init_tmp_table_share(TABLE_SHARE *share, const char *key,
                          uint key_length, const char *table_name,
                          const char *path)
{
  DBUG_ENTER("init_tmp_table_share");

  bzero((char*) share, sizeof(*share));
  init_sql_alloc(&share->mem_root, TABLE_ALLOC_BLOCK_SIZE, 0);
  share->tmp_table=  	         INTERNAL_TMP_TABLE;
  share->db.str=                 (char*) key;
  share->db.length=		 strlen(key);
  share->table_cache_key.str=    (char*) key;
  share->table_cache_key.length= key_length;
  share->table_name.str=         (char*) table_name;
  share->table_name.length=      strlen(table_name);
  share->path.str=               (char*) path;
  share->normalized_path.str=    (char*) path;
  share->path.length= share->normalized_path.length= strlen(path);
  share->frm_version= 		 FRM_VER_TRUE_VARCHAR;

  DBUG_VOID_RETURN;
}


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/*
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  Free table share and memory used by it

  SYNOPSIS
    free_table_share()
    share		Table share

  NOTES
    share->mutex must be locked when we come here if it's not a temp table
*/

void free_table_share(TABLE_SHARE *share)
{
  MEM_ROOT mem_root;
  DBUG_ENTER("free_table_share");
  DBUG_PRINT("enter", ("table: %s.%s", share->db.str, share->table_name.str));
  DBUG_ASSERT(share->ref_count == 0);

  /*
    If someone is waiting for this to be deleted, inform it about this.
    Don't do a delete until we know that no one is refering to this anymore.
  */
  if (share->tmp_table == NO_TMP_TABLE)
  {
    /* share->mutex is locked in release_table_share() */
    while (share->waiting_on_cond)
    {
      pthread_cond_broadcast(&share->cond);
      pthread_cond_wait(&share->cond, &share->mutex);
    }
    /* No thread refers to this anymore */
    pthread_mutex_unlock(&share->mutex);
    pthread_mutex_destroy(&share->mutex);
    pthread_cond_destroy(&share->cond);
  }
  hash_free(&share->name_hash);

  /* We must copy mem_root from share because share is allocated through it */
  memcpy((char*) &mem_root, (char*) &share->mem_root, sizeof(mem_root));
  free_root(&mem_root, MYF(0));                 // Free's share
  DBUG_VOID_RETURN;
}
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/*
  Read table definition from a binary / text based .frm file
  
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  SYNOPSIS
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  open_table_def()
  thd		Thread handler
  share		Fill this with table definition
  db_flags	Bit mask of the following flags: OPEN_VIEW
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  NOTES
    This function is called when the table definition is not cached in
    table_def_cache
    The data is returned in 'share', which is alloced by
    alloc_table_share().. The code assumes that share is initialized.
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  RETURN VALUES
   0	ok
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   1	Error (see open_table_error)
   2    Error (see open_table_error)
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   3    Wrong data in .frm file
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   4    Error (see open_table_error)
   5    Error (see open_table_error: charset unavailable)
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   6    Unknown .frm version
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*/
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int open_table_def(THD *thd, TABLE_SHARE *share, uint db_flags)
{
  int error, table_type;
  bool error_given;
  File file;
  uchar head[288], *disk_buff;
  char	path[FN_REFLEN];
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  MEM_ROOT **root_ptr, *old_root;
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  DBUG_ENTER("open_table_def");
  DBUG_PRINT("enter", ("name: '%s.%s'",share->db.str, share->table_name.str));
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  error= 1;
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  error_given= 0;
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  disk_buff= NULL;
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  strxmov(path, share->normalized_path.str, reg_ext, NullS);
  if ((file= my_open(path, O_RDONLY | O_SHARE, MYF(0))) < 0)
    goto err_not_open;
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  error= 4;
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  if (my_read(file,(byte*) head, 64, MYF(MY_NABP)))
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    goto err;
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  if (head[0] == (uchar) 254 && head[1] == 1)
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  {
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    if (head[2] == FRM_VER || head[2] == FRM_VER+1 ||
        (head[2] >= FRM_VER+3 && head[2] <= FRM_VER+4))
      table_type= 1;
    else
    {
      error= 6;                                 // Unkown .frm version
      goto err;
    }
  }
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  else if (memcmp(head, STRING_WITH_LEN("TYPE=")) == 0)
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  {
    error= 5;
    if (memcmp(head+5,"VIEW",4) == 0)
    {
      share->is_view= 1;
      if (db_flags & OPEN_VIEW)
        error= 0;
    }
    goto err;
  }
  else
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    goto err;
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  /* No handling of text based files yet */
  if (table_type == 1)
  {
    root_ptr= my_pthread_getspecific_ptr(MEM_ROOT**, THR_MALLOC);
    old_root= *root_ptr;
    *root_ptr= &share->mem_root;
    error= open_binary_frm(thd, share, head, file);
    *root_ptr= old_root;

    /*
      We can't mark all tables in 'mysql' database as system since we don't
      allow to lock such tables for writing with any other tables (even with
      other system tables) and some privilege tables need this.
    */
    if (share->db.length == 5 &&
        !my_strcasecmp(system_charset_info, share->db.str, "mysql") &&
        !my_strcasecmp(system_charset_info, share->table_name.str, "proc"))
      share->system_table= 1;
    error_given= 1;
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  }

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  if (!error)
    thd->status_var.opened_shares++;
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err:
  my_close(file, MYF(MY_WME));
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err_not_open:
  if (error && !error_given)
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  {
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    share->error= error;
    open_table_error(share, error, (share->open_errno= my_errno), 0);
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  }
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  DBUG_RETURN(error);
}


/*
  Read data from a binary .frm file from MySQL 3.23 - 5.0 into TABLE_SHARE
*/

static int open_binary_frm(THD *thd, TABLE_SHARE *share, uchar *head,
                           File file)
{
  int error, errarg= 0;
  uint new_frm_ver, field_pack_length, new_field_pack_flag;
  uint interval_count, interval_parts, read_length, int_length;
  uint db_create_options, keys, key_parts, n_length;
  uint key_info_length, com_length, null_bit_pos;
  uint extra_rec_buf_length;
  uint i,j;
  bool use_hash;
  char *keynames, *record, *names, *comment_pos;
  uchar *disk_buff, *strpos, *null_flags, *null_pos;
  ulong pos, record_offset, *rec_per_key, rec_buff_length;
  handler *handler_file= 0;
  KEY	*keyinfo;
  KEY_PART_INFO *key_part;
  SQL_CRYPT *crypted=0;
  Field  **field_ptr, *reg_field;
  const char **interval_array;
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  enum legacy_db_type legacy_db_type;
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  DBUG_ENTER("open_binary_frm");

  new_field_pack_flag= head[27];
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  new_frm_ver= (head[2] - FRM_VER);
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  field_pack_length= new_frm_ver < 2 ? 11 : 17;
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  disk_buff= 0;
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  error= 3;
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  if (!(pos=get_form_pos(file,head,(TYPELIB*) 0)))
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    goto err;                                   /* purecov: inspected */
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  share->frm_version= head[2];
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  /*
    Check if .frm file created by MySQL 5.0. In this case we want to
    display CHAR fields as CHAR and not as VARCHAR.
    We do it this way as we want to keep the old frm version to enable
    MySQL 4.1 to read these files.
  */
  if (share->frm_version == FRM_VER_TRUE_VARCHAR -1 && head[33] == 5)
    share->frm_version= FRM_VER_TRUE_VARCHAR;

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#ifdef WITH_PARTITION_STORAGE_ENGINE
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  share->default_part_db_type= 
        ha_checktype(thd, (enum legacy_db_type) (uint) *(head+61), 0, 0);
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#endif
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  legacy_db_type= (enum legacy_db_type) (uint) *(head+3);
  share->db_type= ha_checktype(thd, legacy_db_type, 0, 0);
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  share->db_create_options= db_create_options= uint2korr(head+30);
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  share->db_options_in_use= share->db_create_options;
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  share->mysql_version= uint4korr(head+51);
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  share->null_field_first= 0;
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  if (!head[32])				// New frm file in 3.23
  {
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    share->avg_row_length= uint4korr(head+34);
    share-> row_type= (row_type) head[40];
    share->raid_type=   head[41];
    share->raid_chunks= head[42];
    share->raid_chunksize= uint4korr(head+43);
    share->table_charset= get_charset((uint) head[38],MYF(0));
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    share->null_field_first= 1;
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  }
  if (!share->table_charset)
  {
    /* unknown charset in head[38] or pre-3.23 frm */
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    if (use_mb(default_charset_info))
    {
      /* Warn that we may be changing the size of character columns */
      sql_print_warning("'%s' had no or invalid character set, "
                        "and default character set is multi-byte, "
                        "so character column sizes may have changed",
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                        share->path);
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    }
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    share->table_charset= default_charset_info;
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  }
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  share->db_record_offset= 1;
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  if (db_create_options & HA_OPTION_LONG_BLOB_PTR)
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    share->blob_ptr_size= portable_sizeof_char_ptr;
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  /* Set temporarily a good value for db_low_byte_first */
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  share->db_low_byte_first= test(legacy_db_type != DB_TYPE_ISAM);
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  error=4;
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  share->max_rows= uint4korr(head+18);
  share->min_rows= uint4korr(head+22);
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  /* Read keyinformation */
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  key_info_length= (uint) uint2korr(head+28);
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  VOID(my_seek(file,(ulong) uint2korr(head+6),MY_SEEK_SET,MYF(0)));
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  if (read_string(file,(gptr*) &disk_buff,key_info_length))
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    goto err;                                   /* purecov: inspected */
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  if (disk_buff[0] & 0x80)
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  {
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    share->keys=      keys=      (disk_buff[1] << 7) | (disk_buff[0] & 0x7f);
    share->key_parts= key_parts= uint2korr(disk_buff+2);
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  }
  else
  {
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    share->keys=      keys=      disk_buff[0];
    share->key_parts= key_parts= disk_buff[1];
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  }
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  share->keys_for_keyread.init(0);
  share->keys_in_use.init(keys);
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  n_length=keys*sizeof(KEY)+key_parts*sizeof(KEY_PART_INFO);
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  if (!(keyinfo = (KEY*) alloc_root(&share->mem_root,
				    n_length + uint2korr(disk_buff+4))))
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    goto err;                                   /* purecov: inspected */
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  bzero((char*) keyinfo,n_length);
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  share->key_info= keyinfo;
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  key_part= my_reinterpret_cast(KEY_PART_INFO*) (keyinfo+keys);
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  strpos=disk_buff+6;

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  if (!(rec_per_key= (ulong*) alloc_root(&share->mem_root,
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					 sizeof(ulong*)*key_parts)))
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    goto err;
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  for (i=0 ; i < keys ; i++, keyinfo++)
  {
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    keyinfo->table= 0;                           // Updated in open_frm
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    if (new_frm_ver >= 3)
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    {
      keyinfo->flags=	   (uint) uint2korr(strpos) ^ HA_NOSAME;
      keyinfo->key_length= (uint) uint2korr(strpos+2);
      keyinfo->key_parts=  (uint) strpos[4];
      keyinfo->algorithm=  (enum ha_key_alg) strpos[5];
      strpos+=8;
    }
    else
    {
      keyinfo->flags=	 ((uint) strpos[0]) ^ HA_NOSAME;
      keyinfo->key_length= (uint) uint2korr(strpos+1);
      keyinfo->key_parts=  (uint) strpos[3];
      keyinfo->algorithm= HA_KEY_ALG_UNDEF;
      strpos+=4;
    }
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    keyinfo->key_part=	 key_part;
    keyinfo->rec_per_key= rec_per_key;
    for (j=keyinfo->key_parts ; j-- ; key_part++)
    {
      *rec_per_key++=0;
      key_part->fieldnr=	(uint16) (uint2korr(strpos) & FIELD_NR_MASK);
      key_part->offset= (uint) uint2korr(strpos+2)-1;
      key_part->key_type=	(uint) uint2korr(strpos+5);
      // key_part->field=	(Field*) 0;	// Will be fixed later
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      if (new_frm_ver >= 1)
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      {
	key_part->key_part_flag= *(strpos+4);
	key_part->length=	(uint) uint2korr(strpos+7);
	strpos+=9;
      }
      else
      {
	key_part->length=	*(strpos+4);
	key_part->key_part_flag=0;
	if (key_part->length > 128)
	{
	  key_part->length&=127;		/* purecov: inspected */
	  key_part->key_part_flag=HA_REVERSE_SORT; /* purecov: inspected */
	}
	strpos+=7;
      }
      key_part->store_length=key_part->length;
    }
  }
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  keynames=(char*) key_part;
  strpos+= (strmov(keynames, (char *) strpos) - keynames)+1;
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  share->reclength = uint2korr((head+16));
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  if (*(head+26) == 1)
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    share->system= 1;				/* one-record-database */
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#ifdef HAVE_CRYPTED_FRM
  else if (*(head+26) == 2)
  {
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    crypted= get_crypt_for_frm();
    share->crypted= 1;
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  }
#endif

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  record_offset= (ulong) (uint2korr(head+6)+
                          ((uint2korr(head+14) == 0xffff ?
                            uint4korr(head+47) : uint2korr(head+14))));
 
  if ((n_length= uint2korr(head+55)))
  {
    /* Read extra data segment */
    char *buff, *next_chunk, *buff_end;
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    DBUG_PRINT("info", ("extra segment size is %u bytes", n_length));
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    if (!(next_chunk= buff= my_malloc(n_length, MYF(MY_WME))))
      goto err;
    if (my_pread(file, (byte*)buff, n_length, record_offset + share->reclength,
                 MYF(MY_NABP)))
    {
      my_free(buff, MYF(0));
      goto err;
    }
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    share->connect_string.length= uint2korr(buff);
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    if (! (share->connect_string.str= strmake_root(&share->mem_root,
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            next_chunk + 2, share->connect_string.length)))
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    {
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      my_free(buff, MYF(0));
      goto err;
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    }
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    next_chunk+= share->connect_string.length + 2;
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    buff_end= buff + n_length;
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    if (next_chunk + 2 < buff_end)
    {
      uint str_db_type_length= uint2korr(next_chunk);
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      LEX_STRING name= { next_chunk + 2, str_db_type_length };
      handlerton *tmp_db_type= ha_resolve_by_name(thd, &name);
      if (tmp_db_type != NULL)
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      {
        share->db_type= tmp_db_type;
        DBUG_PRINT("info", ("setting dbtype to '%.*s' (%d)",
                            str_db_type_length, next_chunk + 2,
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                            ha_legacy_type(share->db_type)));
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      }
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#ifdef WITH_PARTITION_STORAGE_ENGINE
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      else
      {
        if (!strncmp(next_chunk + 2, "partition", str_db_type_length))
        {
          /* Use partition handler */
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          share->db_type= &partition_hton;
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          DBUG_PRINT("info", ("setting dbtype to '%.*s' (%d)",
                              str_db_type_length, next_chunk + 2,
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                              ha_legacy_type(share->db_type)));
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        }
      }
#endif
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      next_chunk+= str_db_type_length + 2;
    }
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    if (next_chunk + 4 < buff_end)
    {
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      uint32 partition_info_len = uint4korr(next_chunk);
#ifdef WITH_PARTITION_STORAGE_ENGINE
      if ((share->partition_info_len= partition_info_len))
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      {
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        if (!(share->partition_info=
              (uchar*) memdup_root(&share->mem_root, next_chunk + 4,
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                                   partition_info_len + 1)))
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        {
          my_free(buff, MYF(0));
          goto err;
        }
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	next_chunk++;
      }
#else
      if (partition_info_len)
      {
        DBUG_PRINT("info", ("WITH_PARTITION_STORAGE_ENGINE is not defined"));
        my_free(buff, MYF(0));
        goto err;
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      }
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#endif
      next_chunk+= 4 + partition_info_len;
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    }
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    keyinfo= share->key_info;
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    for (i= 0; i < keys; i++, keyinfo++)
    {
      if (keyinfo->flags & HA_USES_PARSER)
      {
        LEX_STRING parser_name;
        if (next_chunk >= buff_end)
        {
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          DBUG_PRINT("error",
                     ("fulltext key uses parser that is not defined in .frm"));
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          my_free(buff, MYF(0));
          goto err;
        }
        parser_name.str= next_chunk;
        parser_name.length= strlen(next_chunk);
        keyinfo->parser= plugin_lock(&parser_name, MYSQL_FTPARSER_PLUGIN);
        if (! keyinfo->parser)
        {
          my_free(buff, MYF(0));
          my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), parser_name.str);
          goto err;
        }
      }
    }
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    my_free(buff, MYF(0));
  }
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  error=4;
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  extra_rec_buf_length= uint2korr(head+59);
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  rec_buff_length= ALIGN_SIZE(share->reclength + 1 + extra_rec_buf_length);
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  share->rec_buff_length= rec_buff_length;
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  if (!(record= (char *) alloc_root(&share->mem_root,
                                    rec_buff_length)))
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    goto err;                                   /* purecov: inspected */
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  share->default_values= (byte *) record;
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  if (my_pread(file,(byte*) record, (uint) share->reclength,
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               record_offset, MYF(MY_NABP)))
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    goto err;                                   /* purecov: inspected */
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  VOID(my_seek(file,pos,MY_SEEK_SET,MYF(0)));
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  if (my_read(file,(byte*) head,288,MYF(MY_NABP)))
    goto err;
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#ifdef HAVE_CRYPTED_FRM
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  if (crypted)
  {
    crypted->decode((char*) head+256,288-256);
    if (sint2korr(head+284) != 0)		// Should be 0
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      goto err;                                 // Wrong password
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  }
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#endif
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  share->fields= uint2korr(head+258);
  pos= uint2korr(head+260);			/* Length of all screens */
  n_length= uint2korr(head+268);
  interval_count= uint2korr(head+270);
  interval_parts= uint2korr(head+272);
  int_length= uint2korr(head+274);
  share->null_fields= uint2korr(head+282);
  com_length= uint2korr(head+284);
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  share->comment= strdup_root(&share->mem_root, (char*) head+47);
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  DBUG_PRINT("info",("i_count: %d  i_parts: %d  index: %d  n_length: %d  int_length: %d  com_length: %d", interval_count,interval_parts, share->keys,n_length,int_length, com_length));
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  if (!(field_ptr = (Field **)
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	alloc_root(&share->mem_root,
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		   (uint) ((share->fields+1)*sizeof(Field*)+
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			   interval_count*sizeof(TYPELIB)+
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			   (share->fields+interval_parts+
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			    keys+3)*sizeof(my_string)+
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			   (n_length+int_length+com_length)))))
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    goto err;                                   /* purecov: inspected */
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  share->field= field_ptr;
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  read_length=(uint) (share->fields * field_pack_length +
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		      pos+ (uint) (n_length+int_length+com_length));
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  if (read_string(file,(gptr*) &disk_buff,read_length))
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    goto err;                                   /* purecov: inspected */
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#ifdef HAVE_CRYPTED_FRM
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  if (crypted)
  {
    crypted->decode((char*) disk_buff,read_length);
    delete crypted;
    crypted=0;
  }
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#endif
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  strpos= disk_buff+pos;

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  share->intervals= (TYPELIB*) (field_ptr+share->fields+1);
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  interval_array= (const char **) (share->intervals+interval_count);
  names= (char*) (interval_array+share->fields+interval_parts+keys+3);
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  if (!interval_count)
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    share->intervals= 0;			// For better debugging
  memcpy((char*) names, strpos+(share->fields*field_pack_length),
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	 (uint) (n_length+int_length));
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  comment_pos= names+(n_length+int_length);
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  memcpy(comment_pos, disk_buff+read_length-com_length, com_length);
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  fix_type_pointers(&interval_array, &share->fieldnames, 1, &names);
  fix_type_pointers(&interval_array, share->intervals, interval_count,
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		    &names);
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  {
    /* Set ENUM and SET lengths */
    TYPELIB *interval;
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    for (interval= share->intervals;
         interval < share->intervals + interval_count;
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         interval++)
    {
      uint count= (uint) (interval->count + 1) * sizeof(uint);
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      if (!(interval->type_lengths= (uint *) alloc_root(&share->mem_root,
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                                                        count)))
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        goto err;
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      for (count= 0; count < interval->count; count++)
        interval->type_lengths[count]= strlen(interval->type_names[count]);
      interval->type_lengths[count]= 0;
    }
  }

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  if (keynames)
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    fix_type_pointers(&interval_array, &share->keynames, 1, &keynames);
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 /* Allocate handler */
  if (!(handler_file= get_new_handler(share, thd->mem_root,
                                      share->db_type)))
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    goto err;

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  record= (char*) share->default_values-1;	/* Fieldstart = 1 */
  if (share->null_field_first)
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  {
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    null_flags= null_pos= (uchar*) record+1;
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    null_bit_pos= (db_create_options & HA_OPTION_PACK_RECORD) ? 0 : 1;
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    /*
      null_bytes below is only correct under the condition that
      there are no bit fields.  Correct values is set below after the
      table struct is initialized
    */
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    share->null_bytes= (share->null_fields + null_bit_pos + 7) / 8;
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  }
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#ifndef WE_WANT_TO_SUPPORT_VERY_OLD_FRM_FILES
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  else
  {
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    share->null_bytes= (share->null_fields+7)/8;
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    null_flags= null_pos= (uchar*) (record + 1 +share->reclength -
                                    share->null_bytes);
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    null_bit_pos= 0;
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  }
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#endif
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  use_hash= share->fields >= MAX_FIELDS_BEFORE_HASH;
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  if (use_hash)
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    use_hash= !hash_init(&share->name_hash,
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			 system_charset_info,
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			 share->fields,0,0,
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			 (hash_get_key) get_field_name,0,0);
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  for (i=0 ; i < share->fields; i++, strpos+=field_pack_length, field_ptr++)
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  {
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    uint pack_flag, interval_nr, unireg_type, recpos, field_length;
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    enum_field_types field_type;
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    CHARSET_INFO *charset=NULL;
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    Field::geometry_type geom_type= Field::GEOM_GEOMETRY;
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    LEX_STRING comment;
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    if (new_frm_ver >= 3)
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    {
      /* new frm file in 4.1 */
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      field_length= uint2korr(strpos+3);
      recpos=	    uint3korr(strpos+5);
      pack_flag=    uint2korr(strpos+8);
      unireg_type=  (uint) strpos[10];
      interval_nr=  (uint) strpos[12];
      uint comment_length=uint2korr(strpos+15);
      field_type=(enum_field_types) (uint) strpos[13];
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      /* charset and geometry_type share the same byte in frm */
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      if (field_type == FIELD_TYPE_GEOMETRY)
      {
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#ifdef HAVE_SPATIAL
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	geom_type= (Field::geometry_type) strpos[14];
	charset= &my_charset_bin;
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#else
	error= 4;  // unsupported field type
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	goto err;
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#endif
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      }
      else
      {
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        if (!strpos[14])
          charset= &my_charset_bin;
        else if (!(charset=get_charset((uint) strpos[14], MYF(0))))
        {
          error= 5; // Unknown or unavailable charset
          errarg= (int) strpos[14];
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          goto err;
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        }
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      }
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      if (!comment_length)
      {
	comment.str= (char*) "";
	comment.length=0;
      }
      else
      {
	comment.str=    (char*) comment_pos;
	comment.length= comment_length;
	comment_pos+=   comment_length;
      }
    }
    else
    {
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      field_length= (uint) strpos[3];
      recpos=	    uint2korr(strpos+4),
      pack_flag=    uint2korr(strpos+6);
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      pack_flag&=   ~FIELDFLAG_NO_DEFAULT;     // Safety for old files
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      unireg_type=  (uint) strpos[8];
      interval_nr=  (uint) strpos[10];

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      /* old frm file */
      field_type= (enum_field_types) f_packtype(pack_flag);
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      if (f_is_binary(pack_flag))
      {
        /*
          Try to choose the best 4.1 type:
          - for 4.0 "CHAR(N) BINARY" or "VARCHAR(N) BINARY" 
            try to find a binary collation for character set.
          - for other types (e.g. BLOB) just use my_charset_bin. 
        */
        if (!f_is_blob(pack_flag))
        {
          // 3.23 or 4.0 string
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          if (!(charset= get_charset_by_csname(share->table_charset->csname,
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                                               MY_CS_BINSORT, MYF(0))))
            charset= &my_charset_bin;
        }
        else
          charset= &my_charset_bin;
      }
      else
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        charset= share->table_charset;
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      bzero((char*) &comment, sizeof(comment));
    }
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    if (interval_nr && charset->mbminlen > 1)
    {
      /* Unescape UCS2 intervals from HEX notation */
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      TYPELIB *interval= share->intervals + interval_nr - 1;
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      unhex_type2(interval);
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    }
    
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#ifndef TO_BE_DELETED_ON_PRODUCTION
    if (field_type == FIELD_TYPE_NEWDECIMAL && !share->mysql_version)
    {
      /*
        Fix pack length of old decimal values from 5.0.3 -> 5.0.4
        The difference is that in the old version we stored precision
        in the .frm table while we now store the display_length
      */
      uint decimals= f_decimals(pack_flag);
      field_length= my_decimal_precision_to_length(field_length,
                                                   decimals,
                                                   f_is_dec(pack_flag) == 0);
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      sql_print_error("Found incompatible DECIMAL field '%s' in %s; "
                      "Please do \"ALTER TABLE '%s' FORCE\" to fix it!",
                      share->fieldnames.type_names[i], share->table_name.str,
                      share->table_name.str);
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      push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
                          ER_CRASHED_ON_USAGE,
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                          "Found incompatible DECIMAL field '%s' in %s; "
                          "Please do \"ALTER TABLE '%s' FORCE\" to fix it!",
                          share->fieldnames.type_names[i],
                          share->table_name.str,
                          share->table_name.str);
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      share->crashed= 1;                        // Marker for CHECK TABLE
    }
#endif

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    *field_ptr= reg_field=
      make_field(share, record+recpos,
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		 (uint32) field_length,
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		 null_pos, null_bit_pos,
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		 pack_flag,
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		 field_type,
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		 charset,
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		 geom_type,
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		 (Field::utype) MTYP_TYPENR(unireg_type),
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		 (interval_nr ?
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		  share->intervals+interval_nr-1 :
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		  (TYPELIB*) 0),
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		 share->fieldnames.type_names[i]);
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    if (!reg_field)				// Not supported field type
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    {
      error= 4;
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      goto err;			/* purecov: inspected */
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    }
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    reg_field->fieldnr= i+1;                    //Set field number
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    reg_field->field_index= i;
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    reg_field->comment=comment;
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    if (field_type == FIELD_TYPE_BIT && !f_bit_as_char(pack_flag))
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    {
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      if ((null_bit_pos+= field_length & 7) > 7)
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      {
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        null_pos++;
        null_bit_pos-= 8;
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      }
    }
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    if (!(reg_field->flags & NOT_NULL_FLAG))
    {
      if (!(null_bit_pos= (null_bit_pos + 1) & 7))
        null_pos++;
    }
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    if (f_no_default(pack_flag))
      reg_field->flags|= NO_DEFAULT_VALUE_FLAG;
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    if (reg_field->unireg_check == Field::NEXT_NUMBER)
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      share->found_next_number_field= field_ptr;
    if (share->timestamp_field == reg_field)
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      share->timestamp_field_offset= i;
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    if (use_hash)
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      (void) my_hash_insert(&share->name_hash,
                            (byte*) field_ptr); // never fail
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  }
  *field_ptr=0;					// End marker

  /* Fix key->name and key_part->field */
  if (key_parts)
  {
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    uint primary_key=(uint) (find_type((char*) primary_key_name,
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				       &share->keynames, 3) - 1);
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    uint ha_option= handler_file->table_flags();
    keyinfo= share->key_info;
    key_part= keyinfo->key_part;
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    for (uint key=0 ; key < share->keys ; key++,keyinfo++)
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    {
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      uint usable_parts= 0;
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      keyinfo->name=(char*) share->keynames.type_names[key];
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      /* Fix fulltext keys for old .frm files */
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      if (share->key_info[key].flags & HA_FULLTEXT)
	share->key_info[key].algorithm= HA_KEY_ALG_FULLTEXT;
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      if (primary_key >= MAX_KEY && (keyinfo->flags & HA_NOSAME))
      {
	/*
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	  If the UNIQUE key doesn't have NULL columns and is not a part key
	  declare this as a primary key.
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	*/
	primary_key=key;
	for (i=0 ; i < keyinfo->key_parts ;i++)
	{
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	  uint fieldnr= key_part[i].fieldnr;
	  if (!fieldnr ||
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	      share->field[fieldnr-1]->null_ptr ||
	      share->field[fieldnr-1]->key_length() !=
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	      key_part[i].length)
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	  {
	    primary_key=MAX_KEY;		// Can't be used
	    break;
	  }
	}
      }

      for (i=0 ; i < keyinfo->key_parts ; key_part++,i++)
      {
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        Field *field;
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	if (new_field_pack_flag <= 1)
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	  key_part->fieldnr= (uint16) find_field(share->field,
                                                 (uint) key_part->offset,
                                                 (uint) key_part->length);
	if (!key_part->fieldnr)
        {
          error= 4;                             // Wrong file
          goto err;
        }
        field= key_part->field= share->field[key_part->fieldnr-1];
        if (field->null_ptr)
        {
          key_part->null_offset=(uint) ((byte*) field->null_ptr -
                                        share->default_values);
          key_part->null_bit= field->null_bit;
          key_part->store_length+=HA_KEY_NULL_LENGTH;
          keyinfo->flags|=HA_NULL_PART_KEY;
          keyinfo->extra_length+= HA_KEY_NULL_LENGTH;
          keyinfo->key_length+= HA_KEY_NULL_LENGTH;
        }
        if (field->type() == FIELD_TYPE_BLOB ||
            field->real_type() == MYSQL_TYPE_VARCHAR)
        {
          if (field->type() == FIELD_TYPE_BLOB)
            key_part->key_part_flag|= HA_BLOB_PART;
          else
            key_part->key_part_flag|= HA_VAR_LENGTH_PART;
          keyinfo->extra_length+=HA_KEY_BLOB_LENGTH;
          key_part->store_length+=HA_KEY_BLOB_LENGTH;
          keyinfo->key_length+= HA_KEY_BLOB_LENGTH;
          /*
            Mark that there may be many matching values for one key
            combination ('a', 'a ', 'a  '...)
          */
          if (!(field->flags & BINARY_FLAG))
            keyinfo->flags|= HA_END_SPACE_KEY;
        }
        if (field->type() == MYSQL_TYPE_BIT)
          key_part->key_part_flag|= HA_BIT_PART;

        if (i == 0 && key != primary_key)
          field->flags |= (((keyinfo->flags & HA_NOSAME) &&
                           (keyinfo->key_parts == 1)) ?
                           UNIQUE_KEY_FLAG : MULTIPLE_KEY_FLAG);
        if (i == 0)
          field->key_start.set_bit(key);
        if (field->key_length() == key_part->length &&
            !(field->flags & BLOB_FLAG))
        {
          if (handler_file->index_flags(key, i, 0) & HA_KEYREAD_ONLY)
          {
            share->keys_for_keyread.set_bit(key);
            field->part_of_key.set_bit(key);
          }
          if (handler_file->index_flags(key, i, 1) & HA_READ_ORDER)
            field->part_of_sortkey.set_bit(key);
        }
        if (!(key_part->key_part_flag & HA_REVERSE_SORT) &&
            usable_parts == i)
          usable_parts++;			// For FILESORT
        field->flags|= PART_KEY_FLAG;
        if (key == primary_key)
        {
          field->flags|= PRI_KEY_FLAG;
          /*
            If this field is part of the primary key and all keys contains
            the primary key, then we can use any key to find this column
          */
          if (ha_option & HA_PRIMARY_KEY_IN_READ_INDEX)
            field->part_of_key= share->keys_in_use;
        }
        if (field->key_length() != key_part->length)
        {
1005
#ifndef TO_BE_DELETED_ON_PRODUCTION
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          if (field->type() == FIELD_TYPE_NEWDECIMAL)
          {
            /*
              Fix a fatal error in decimal key handling that causes crashes
              on Innodb. We fix it by reducing the key length so that
              InnoDB never gets a too big key when searching.
              This allows the end user to do an ALTER TABLE to fix the
              error.
            */
            keyinfo->key_length-= (key_part->length - field->key_length());
            key_part->store_length-= (uint16)(key_part->length -
                                              field->key_length());
            key_part->length= (uint16)field->key_length();
            sql_print_error("Found wrong key definition in %s; "
                            "Please do \"ALTER TABLE '%s' FORCE \" to fix it!",
                            share->table_name.str,
                            share->table_name.str);
            push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
                                ER_CRASHED_ON_USAGE,
                                "Found wrong key definition in %s; "
                                "Please do \"ALTER TABLE '%s' FORCE\" to fix "
                                "it!",
                                share->table_name.str,
                                share->table_name.str);
            share->crashed= 1;                // Marker for CHECK TABLE
            goto to_be_deleted;
          }
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#endif
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          key_part->key_part_flag|= HA_PART_KEY_SEG;
        }
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	to_be_deleted:

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        /*
          If the field can be NULL, don't optimize away the test
          key_part_column = expression from the WHERE clause
          as we need to test for NULL = NULL.
        */
        if (field->real_maybe_null())
          key_part->key_part_flag|= HA_PART_KEY_SEG;
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      }
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      keyinfo->usable_key_parts= usable_parts; // Filesort
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      set_if_bigger(share->max_key_length,keyinfo->key_length+
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                    keyinfo->key_parts);
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      share->total_key_length+= keyinfo->key_length;
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      /*
        MERGE tables do not have unique indexes. But every key could be
        an unique index on the underlying MyISAM table. (Bug #10400)
      */
      if ((keyinfo->flags & HA_NOSAME) ||
          (ha_option & HA_ANY_INDEX_MAY_BE_UNIQUE))
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        set_if_bigger(share->max_unique_length,keyinfo->key_length);
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    }
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    if (primary_key < MAX_KEY &&
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	(share->keys_in_use.is_set(primary_key)))
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    {
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      share->primary_key= primary_key;
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      /*
	If we are using an integer as the primary key then allow the user to
	refer to it as '_rowid'
      */
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      if (share->key_info[primary_key].key_parts == 1)
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      {
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	Field *field= share->key_info[primary_key].key_part[0].field;
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	if (field && field->result_type() == INT_RESULT)
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        {
          /* note that fieldnr here (and rowid_field_offset) starts from 1 */
	  share->rowid_field_offset= (share->key_info[primary_key].key_part[0].
                                      fieldnr);
        }
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      }
    }
    else
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      share->primary_key = MAX_KEY; // we do not have a primary key
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  }
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  else
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    share->primary_key= MAX_KEY;
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  x_free((gptr) disk_buff);
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  disk_buff=0;
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  if (new_field_pack_flag <= 1)
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  {
    /* Old file format with default as not null */
    uint null_length= (share->null_fields+7)/8;
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    bfill(share->default_values + (null_flags - (uchar*) record),
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          null_length, 255);
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  }

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  if (share->found_next_number_field)
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  {
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    /*
      We must have a table object for find_ref_key to calculate field offset
    */
    TABLE tmp_table;
    tmp_table.record[0]= share->default_values;

    reg_field= *share->found_next_number_field;
    reg_field->table= &tmp_table;
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    if ((int) (share->next_number_index= (uint)
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	       find_ref_key(share->key_info, share->keys, reg_field,
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			    &share->next_number_key_offset)) < 0)
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    {
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      reg_field->unireg_check= Field::NONE;	/* purecov: inspected */
      share->found_next_number_field= 0;
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    }
    else
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      reg_field->flags |= AUTO_INCREMENT_FLAG;
    reg_field->table= 0;
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  }

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  if (share->blob_fields)
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  {
    Field **ptr;
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    uint i, *save;
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    /* Store offsets to blob fields to find them fast */
    if (!(share->blob_field= save=
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	  (uint*) alloc_root(&share->mem_root,
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                             (uint) (share->blob_fields* sizeof(uint)))))
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      goto err;
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    for (i=0, ptr= share->field ; *ptr ; ptr++, i++)
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    {
      if ((*ptr)->flags & BLOB_FLAG)
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	(*save++)= i;
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    }
  }

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  /*
    the correct null_bytes can now be set, since bitfields have been taken
    into account
  */
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  share->null_bytes= (null_pos - (uchar*) null_flags +
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                      (null_bit_pos + 7) / 8);
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  share->last_null_bit_pos= null_bit_pos;
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  share->db_low_byte_first= handler_file->low_byte_first();
  delete handler_file;
#ifndef DBUG_OFF
  if (use_hash)
    (void) hash_check(&share->name_hash);
#endif
  DBUG_RETURN (0);

 err:
  share->error= error;
  share->open_errno= my_errno;
  share->errarg= errarg;
  x_free((gptr) disk_buff);
  delete crypted;
  delete handler_file;
  hash_free(&share->name_hash);

  open_table_error(share, error, share->open_errno, errarg);
  DBUG_RETURN(error);
} /* open_binary_frm */


/*
  Open a table based on a TABLE_SHARE

  SYNOPSIS
    open_table_from_share()
    thd			Thread handler
    share		Table definition
    alias       	Alias for table
    db_stat		open flags (for example HA_OPEN_KEYFILE|
    			HA_OPEN_RNDFILE..) can be 0 (example in
                        ha_example_table)
    prgflag   		READ_ALL etc..
    ha_open_flags	HA_OPEN_ABORT_IF_LOCKED etc..
    outparam       	result table

  RETURN VALUES
   0	ok
   1	Error (see open_table_error)
   2    Error (see open_table_error)
   3    Wrong data in .frm file
   4    Error (see open_table_error)
   5    Error (see open_table_error: charset unavailable)
   7    Table definition has changed in engine
*/

int open_table_from_share(THD *thd, TABLE_SHARE *share, const char *alias,
                          uint db_stat, uint prgflag, uint ha_open_flags,
                          TABLE *outparam)
{
  int error;
  uint records, i;
  bool error_reported= FALSE;
  byte *record;
  Field **field_ptr;
  MEM_ROOT **root_ptr, *old_root;
  DBUG_ENTER("open_table_from_share");
  DBUG_PRINT("enter",("name: '%s.%s'  form: 0x%lx", share->db.str,
                      share->table_name.str, outparam));

  error= 1;
  root_ptr= my_pthread_getspecific_ptr(MEM_ROOT**, THR_MALLOC);
  old_root= *root_ptr;
  bzero((char*) outparam, sizeof(*outparam));
  outparam->in_use= thd;
  outparam->s= share;
  outparam->db_stat= db_stat;
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  outparam->write_row_record= NULL;
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  init_sql_alloc(&outparam->mem_root, TABLE_ALLOC_BLOCK_SIZE, 0);
  *root_ptr= &outparam->mem_root;

  if (!(outparam->alias= my_strdup(alias, MYF(MY_WME))))
    goto err;
  outparam->quick_keys.init();
  outparam->used_keys.init();
  outparam->keys_in_use_for_query.init();

  /* Allocate handler */
  if (!(outparam->file= get_new_handler(share, &outparam->mem_root,
                                        share->db_type)))
    goto err;

  error= 4;
  outparam->reginfo.lock_type= TL_UNLOCK;
  outparam->current_lock= F_UNLCK;
  records=0;
  if ((db_stat & HA_OPEN_KEYFILE) || (prgflag & DELAYED_OPEN))
    records=1;
  if (prgflag & (READ_ALL+EXTRA_RECORD))
    records++;

  if (!(record= (byte*) alloc_root(&outparam->mem_root,
                                   share->rec_buff_length * records)))
    goto err;                                   /* purecov: inspected */

  if (records == 0)
  {
    /* We are probably in hard repair, and the buffers should not be used */
    outparam->record[0]= outparam->record[1]= share->default_values;
  }
  else
  {
    outparam->record[0]= record;
    if (records > 1)
      outparam->record[1]= record+ share->rec_buff_length;
    else
      outparam->record[1]= outparam->record[0];   // Safety
  }

#ifdef HAVE_purify
  /*
    We need this because when we read var-length rows, we are not updating
    bytes after end of varchar
  */
  if (records > 1)
  {
    memcpy(outparam->record[0], share->default_values, share->rec_buff_length);
    if (records > 2)
      memcpy(outparam->record[1], share->default_values,
             share->rec_buff_length);
  }
#endif

  if (!(field_ptr = (Field **) alloc_root(&outparam->mem_root,
                                          (uint) ((share->fields+1)*
                                                  sizeof(Field*)))))
    goto err;                                   /* purecov: inspected */

  outparam->field= field_ptr;

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  record= (byte*) outparam->record[0]-1;	/* Fieldstart = 1 */
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  if (share->null_field_first)
    outparam->null_flags= (uchar*) record+1;
  else
    outparam->null_flags= (uchar*) (record+ 1+ share->reclength -
                                    share->null_bytes);

  /* Setup copy of fields from share, but use the right alias and record */
  for (i=0 ; i < share->fields; i++, field_ptr++)
  {
    if (!((*field_ptr)= share->field[i]->clone(&outparam->mem_root, outparam)))
      goto err;
  }
  (*field_ptr)= 0;                              // End marker

  if (share->found_next_number_field)
    outparam->found_next_number_field=
      outparam->field[(uint) (share->found_next_number_field - share->field)];
  if (share->timestamp_field)
    outparam->timestamp_field= (Field_timestamp*) outparam->field[share->timestamp_field_offset];


  /* Fix key->name and key_part->field */
  if (share->key_parts)
  {
    KEY	*key_info, *key_info_end;
    KEY_PART_INFO *key_part;
    uint n_length;
    n_length= share->keys*sizeof(KEY) + share->key_parts*sizeof(KEY_PART_INFO);
    if (!(key_info= (KEY*) alloc_root(&outparam->mem_root, n_length)))
      goto err;
    outparam->key_info= key_info;
    key_part= (my_reinterpret_cast(KEY_PART_INFO*) (key_info+share->keys));
    
    memcpy(key_info, share->key_info, sizeof(*key_info)*share->keys);
    memcpy(key_part, share->key_info[0].key_part, (sizeof(*key_part) *
                                                   share->key_parts));

    for (key_info_end= key_info + share->keys ;
         key_info < key_info_end ;
         key_info++)
    {
      KEY_PART_INFO *key_part_end;

      key_info->table= outparam;
      key_info->key_part= key_part;

      for (key_part_end= key_part+ key_info->key_parts ;
           key_part < key_part_end ;
           key_part++)
      {
        Field *field= key_part->field= outparam->field[key_part->fieldnr-1];

        if (field->key_length() != key_part->length &&
            !(field->flags & BLOB_FLAG))
        {
          /*
            We are using only a prefix of the column as a key:
            Create a new field for the key part that matches the index
          */
          field= key_part->field=field->new_field(&outparam->mem_root,
                                                  outparam);
          field->field_length= key_part->length;
        }
      }
    }
  }

#ifdef WITH_PARTITION_STORAGE_ENGINE
  if (share->partition_info_len)
  {
    if (mysql_unpack_partition(thd, share->partition_info,
                               share->partition_info_len,
                               outparam, share->default_part_db_type))
      goto err;
    /*
      Fix the partition functions and ensure they are not constant
      functions
    */
    if (fix_partition_func(thd, share->normalized_path.str, outparam))
      goto err;
  }
#endif

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  /* The table struct is now initialized;  Open the table */
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  error= 2;
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  if (db_stat)
  {
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    int ha_err;
    if ((ha_err= (outparam->file->
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                  ha_open(outparam, share->normalized_path.str,
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                          (db_stat & HA_READ_ONLY ? O_RDONLY : O_RDWR),
                          (db_stat & HA_OPEN_TEMPORARY ? HA_OPEN_TMP_TABLE :
                           ((db_stat & HA_WAIT_IF_LOCKED) ||
                            (specialflag & SPECIAL_WAIT_IF_LOCKED)) ?
                           HA_OPEN_WAIT_IF_LOCKED :
                           (db_stat & (HA_ABORT_IF_LOCKED | HA_GET_INFO)) ?
                          HA_OPEN_ABORT_IF_LOCKED :
                           HA_OPEN_IGNORE_IF_LOCKED) | ha_open_flags))))
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    {
      /* Set a flag if the table is crashed and it can be auto. repaired */
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      share->crashed= ((ha_err == HA_ERR_CRASHED_ON_USAGE) &&
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                       outparam->file->auto_repair() &&
                       !(ha_open_flags & HA_OPEN_FOR_REPAIR));
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      if (ha_err == HA_ERR_NO_SUCH_TABLE)
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      {
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	/*
          The table did not exists in storage engine, use same error message
          as if the .frm file didn't exist
        */
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	error= 1;
	my_errno= ENOENT;
      }
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      else
      {
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        outparam->file->print_error(ha_err, MYF(0));
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        error_reported= TRUE;
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        if (ha_err == HA_ERR_TABLE_DEF_CHANGED)
          error= 7;
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      }
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      goto err;                                 /* purecov: inspected */
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    }
  }

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  *root_ptr= old_root;
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  thd->status_var.opened_tables++;
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#ifdef HAVE_REPLICATION

  /*
     This constant is used to mark that no table map version has been
     assigned.  No arithmetic is done on the value: it will be
     overwritten with a value taken from MYSQL_BIN_LOG.
  */
  share->table_map_version= ~(ulonglong)0;

  /*
    Since openfrm() can be called without any locking (for example,
    ha_create_table... functions), we do not assign a table map id
    here.  Instead we assign a value that is not used elsewhere, and
    then assign a table map id inside open_table() under the
    protection of the LOCK_open mutex.
   */
  share->table_map_id= ULONG_MAX;
#endif

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  DBUG_RETURN (0);

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 err:
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  *root_ptr= old_root;
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  if (! error_reported)
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    open_table_error(share, error, my_errno, 0);
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  delete outparam->file;
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#ifdef WITH_PARTITION_STORAGE_ENGINE
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  if (outparam->part_info)
    free_items(outparam->part_info->item_free_list);
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#endif
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  outparam->file= 0;				// For easier error checking
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  outparam->db_stat=0;
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  free_root(&outparam->mem_root, MYF(0));       // Safe to call on bzero'd root
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  my_free((char*) outparam->alias, MYF(MY_ALLOW_ZERO_PTR));
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  DBUG_RETURN (error);
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}
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	/* close a .frm file and it's tables */

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int closefrm(register TABLE *table, bool free_share)
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{
  int error=0;
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  uint idx;
  KEY *key_info;
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  DBUG_ENTER("closefrm");
  if (table->db_stat)
    error=table->file->close();
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  key_info= table->key_info;
  for (idx= table->s->keys; idx; idx--, key_info++)
  {
    if (key_info->flags & HA_USES_PARSER)
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    {
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      plugin_unlock(key_info->parser);
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      key_info->flags= 0;
    }
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  }
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  my_free((char*) table->alias, MYF(MY_ALLOW_ZERO_PTR));
  table->alias= 0;
  if (table->field)
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  {
    for (Field **ptr=table->field ; *ptr ; ptr++)
      delete *ptr;
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    table->field= 0;
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  }
  delete table->file;
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  table->file= 0;				/* For easier errorchecking */
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#ifdef WITH_PARTITION_STORAGE_ENGINE
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  if (table->part_info)
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  {
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    free_items(table->part_info->item_free_list);
    table->part_info= 0;
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  }
#endif
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  if (free_share)
  {
    if (table->s->tmp_table == NO_TMP_TABLE)
      release_table_share(table->s, RELEASE_NORMAL);
    else
      free_table_share(table->s);
  }
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  free_root(&table->mem_root, MYF(0));
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  DBUG_RETURN(error);
}


/* Deallocate temporary blob storage */

void free_blobs(register TABLE *table)
{
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  uint *ptr, *end;
  for (ptr= table->s->blob_field, end=ptr + table->s->blob_fields ;
       ptr != end ;
       ptr++)
    ((Field_blob*) table->field[*ptr])->free();
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}


	/* Find where a form starts */
	/* if formname is NullS then only formnames is read */

ulong get_form_pos(File file, uchar *head, TYPELIB *save_names)
{
  uint a_length,names,length;
  uchar *pos,*buf;
  ulong ret_value=0;
  DBUG_ENTER("get_form_pos");

  names=uint2korr(head+8);
  a_length=(names+2)*sizeof(my_string);		/* Room for two extra */

  if (!save_names)
    a_length=0;
  else
    save_names->type_names=0;			/* Clear if error */

  if (names)
  {
    length=uint2korr(head+4);
    VOID(my_seek(file,64L,MY_SEEK_SET,MYF(0)));
    if (!(buf= (uchar*) my_malloc((uint) length+a_length+names*4,
				  MYF(MY_WME))) ||
	my_read(file,(byte*) buf+a_length,(uint) (length+names*4),
		MYF(MY_NABP)))
    {						/* purecov: inspected */
      x_free((gptr) buf);			/* purecov: inspected */
      DBUG_RETURN(0L);				/* purecov: inspected */
    }
    pos= buf+a_length+length;
    ret_value=uint4korr(pos);
  }
  if (! save_names)
    my_free((gptr) buf,MYF(0));
  else if (!names)
    bzero((char*) save_names,sizeof(save_names));
  else
  {
    char *str;
    str=(char *) (buf+a_length);
    fix_type_pointers((const char ***) &buf,save_names,1,&str);
  }
  DBUG_RETURN(ret_value);
}


	/* Read string from a file with malloc */

int read_string(File file, gptr *to, uint length)
{
  DBUG_ENTER("read_string");

  x_free((gptr) *to);
  if (!(*to= (gptr) my_malloc(length+1,MYF(MY_WME))) ||
      my_read(file,(byte*) *to,length,MYF(MY_NABP)))
  {
    x_free((gptr) *to); /* purecov: inspected */
    *to= 0; /* purecov: inspected */
    DBUG_RETURN(1); /* purecov: inspected */
  }
  *((char*) *to+length)= '\0';
  DBUG_RETURN (0);
} /* read_string */


	/* Add a new form to a form file */

ulong make_new_entry(File file, uchar *fileinfo, TYPELIB *formnames,
		     const char *newname)
{
  uint i,bufflength,maxlength,n_length,length,names;
  ulong endpos,newpos;
  char buff[IO_SIZE];
  uchar *pos;
  DBUG_ENTER("make_new_entry");

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  length=(uint) strlen(newname)+1;
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  n_length=uint2korr(fileinfo+4);
  maxlength=uint2korr(fileinfo+6);
  names=uint2korr(fileinfo+8);
  newpos=uint4korr(fileinfo+10);

  if (64+length+n_length+(names+1)*4 > maxlength)
  {						/* Expand file */
    newpos+=IO_SIZE;
    int4store(fileinfo+10,newpos);
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    endpos=(ulong) my_seek(file,0L,MY_SEEK_END,MYF(0));/* Copy from file-end */
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    bufflength= (uint) (endpos & (IO_SIZE-1));	/* IO_SIZE is a power of 2 */

    while (endpos > maxlength)
    {
      VOID(my_seek(file,(ulong) (endpos-bufflength),MY_SEEK_SET,MYF(0)));
      if (my_read(file,(byte*) buff,bufflength,MYF(MY_NABP+MY_WME)))
	DBUG_RETURN(0L);
      VOID(my_seek(file,(ulong) (endpos-bufflength+IO_SIZE),MY_SEEK_SET,
		   MYF(0)));
      if ((my_write(file,(byte*) buff,bufflength,MYF(MY_NABP+MY_WME))))
	DBUG_RETURN(0);
      endpos-=bufflength; bufflength=IO_SIZE;
    }
    bzero(buff,IO_SIZE);			/* Null new block */
    VOID(my_seek(file,(ulong) maxlength,MY_SEEK_SET,MYF(0)));
    if (my_write(file,(byte*) buff,bufflength,MYF(MY_NABP+MY_WME)))
	DBUG_RETURN(0L);
    maxlength+=IO_SIZE;				/* Fix old ref */
    int2store(fileinfo+6,maxlength);
    for (i=names, pos= (uchar*) *formnames->type_names+n_length-1; i-- ;
	 pos+=4)
    {
      endpos=uint4korr(pos)+IO_SIZE;
      int4store(pos,endpos);
    }
  }

  if (n_length == 1 )
  {						/* First name */
    length++;
    VOID(strxmov(buff,"/",newname,"/",NullS));
  }
  else
    VOID(strxmov(buff,newname,"/",NullS)); /* purecov: inspected */
  VOID(my_seek(file,63L+(ulong) n_length,MY_SEEK_SET,MYF(0)));
  if (my_write(file,(byte*) buff,(uint) length+1,MYF(MY_NABP+MY_WME)) ||
      (names && my_write(file,(byte*) (*formnames->type_names+n_length-1),
			 names*4, MYF(MY_NABP+MY_WME))) ||
      my_write(file,(byte*) fileinfo+10,(uint) 4,MYF(MY_NABP+MY_WME)))
    DBUG_RETURN(0L); /* purecov: inspected */

  int2store(fileinfo+8,names+1);
  int2store(fileinfo+4,n_length+length);
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  VOID(my_chsize(file, newpos, 0, MYF(MY_WME)));/* Append file with '\0' */
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  DBUG_RETURN(newpos);
} /* make_new_entry */


	/* error message when opening a form file */

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void open_table_error(TABLE_SHARE *share, int error, int db_errno, int errarg)
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{
  int err_no;
  char buff[FN_REFLEN];
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  myf errortype= ME_ERROR+ME_WAITTANG;
  DBUG_ENTER("open_table_error");
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  switch (error) {
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  case 7:
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  case 1:
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    if (db_errno == ENOENT)
      my_error(ER_NO_SUCH_TABLE, MYF(0), share->db.str, share->table_name.str);
    else
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    {
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      strxmov(buff, share->normalized_path.str, reg_ext, NullS);
      my_error(ER_FILE_NOT_FOUND, errortype, buff, db_errno);
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    }
    break;
  case 2:
  {
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    handler *file= 0;
    const char *datext= "";
    
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    if (share->db_type != NULL)
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    {
      if ((file= get_new_handler(share, current_thd->mem_root,
                                 share->db_type)))
      {
        if (!(datext= *file->bas_ext()))
          datext= "";
      }
    }
    err_no= (db_errno == ENOENT) ? ER_FILE_NOT_FOUND : (db_errno == EAGAIN) ?
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      ER_FILE_USED : ER_CANT_OPEN_FILE;
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    strxmov(buff, share->normalized_path.str, datext, NullS);
    my_error(err_no,errortype, buff, db_errno);
    delete file;
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    break;
  }
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  case 5:
  {
    const char *csname= get_charset_name((uint) errarg);
    char tmp[10];
    if (!csname || csname[0] =='?')
    {
      my_snprintf(tmp, sizeof(tmp), "#%d", errarg);
      csname= tmp;
    }
    my_printf_error(ER_UNKNOWN_COLLATION,
                    "Unknown collation '%s' in table '%-.64s' definition", 
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                    MYF(0), csname, share->table_name.str);
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    break;
  }
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  case 6:
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    strxmov(buff, share->normalized_path.str, reg_ext, NullS);
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    my_printf_error(ER_NOT_FORM_FILE,
                    "Table '%-.64s' was created with a different version "
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                    "of MySQL and cannot be read", 
                    MYF(0), buff);
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    break;
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  default:				/* Better wrong error than none */
  case 4:
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    strxmov(buff, share->normalized_path.str, reg_ext, NullS);
    my_error(ER_NOT_FORM_FILE, errortype, buff, 0);
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    break;
  }
  DBUG_VOID_RETURN;
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} /* open_table_error */
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	/*
	** fix a str_type to a array type
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	** typeparts separated with some char. differents types are separated
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	** with a '\0'
	*/

static void
fix_type_pointers(const char ***array, TYPELIB *point_to_type, uint types,
		  char **names)
{
  char *type_name, *ptr;
  char chr;

  ptr= *names;
  while (types--)
  {
    point_to_type->name=0;
    point_to_type->type_names= *array;

    if ((chr= *ptr))			/* Test if empty type */
    {
      while ((type_name=strchr(ptr+1,chr)) != NullS)
      {
	*((*array)++) = ptr+1;
	*type_name= '\0';		/* End string */
	ptr=type_name;
      }
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      ptr+=2;				/* Skip end mark and last 0 */
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    }
    else
      ptr++;
    point_to_type->count= (uint) (*array - point_to_type->type_names);
    point_to_type++;
    *((*array)++)= NullS;		/* End of type */
  }
  *names=ptr;				/* Update end */
  return;
} /* fix_type_pointers */


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TYPELIB *typelib(MEM_ROOT *mem_root, List<String> &strings)
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{
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  TYPELIB *result= (TYPELIB*) alloc_root(mem_root, sizeof(TYPELIB));
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  if (!result)
    return 0;
  result->count=strings.elements;
  result->name="";
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  uint nbytes= (sizeof(char*) + sizeof(uint)) * (result->count + 1);
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  if (!(result->type_names= (const char**) alloc_root(mem_root, nbytes)))
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    return 0;
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  result->type_lengths= (uint*) (result->type_names + result->count + 1);
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  List_iterator<String> it(strings);
  String *tmp;
  for (uint i=0; (tmp=it++) ; i++)
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  {
    result->type_names[i]= tmp->ptr();
    result->type_lengths[i]= tmp->length();
  }
  result->type_names[result->count]= 0;		// End marker
  result->type_lengths[result->count]= 0;
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  return result;
}


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/*
 Search after a field with given start & length
 If an exact field isn't found, return longest field with starts
 at right position.
 
 NOTES
   This is needed because in some .frm fields 'fieldnr' was saved wrong

 RETURN
   0  error
   #  field number +1
*/
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static uint find_field(Field **fields, uint start, uint length)
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{
  Field **field;
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  uint i, pos;
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  pos= 0;
  for (field= fields, i=1 ; *field ; i++,field++)
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  {
    if ((*field)->offset() == start)
    {
      if ((*field)->key_length() == length)
	return (i);
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      if (!pos || fields[pos-1]->pack_length() <
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	  (*field)->pack_length())
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	pos= i;
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    }
  }
  return (pos);
}


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	/* Check that the integer is in the internal */
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int set_zone(register int nr, int min_zone, int max_zone)
{
  if (nr<=min_zone)
    return (min_zone);
  if (nr>=max_zone)
    return (max_zone);
  return (nr);
} /* set_zone */

	/* Adjust number to next larger disk buffer */

ulong next_io_size(register ulong pos)
{
  reg2 ulong offset;
  if ((offset= pos & (IO_SIZE-1)))
    return pos-offset+IO_SIZE;
  return pos;
} /* next_io_size */


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/*
  Store an SQL quoted string.

  SYNOPSIS  
    append_unescaped()
    res		result String
    pos		string to be quoted
    length	it's length

  NOTE
    This function works correctly with utf8 or single-byte charset strings.
    May fail with some multibyte charsets though.
*/
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void append_unescaped(String *res, const char *pos, uint length)
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{
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  const char *end= pos+length;
  res->append('\'');

  for (; pos != end ; pos++)
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  {
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#if defined(USE_MB) && MYSQL_VERSION_ID < 40100
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    uint mblen;
    if (use_mb(default_charset_info) &&
        (mblen= my_ismbchar(default_charset_info, pos, end)))
    {
      res->append(pos, mblen);
      pos+= mblen;
      continue;
    }
#endif

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    switch (*pos) {
    case 0:				/* Must be escaped for 'mysql' */
      res->append('\\');
      res->append('0');
      break;
    case '\n':				/* Must be escaped for logs */
      res->append('\\');
      res->append('n');
      break;
    case '\r':
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      res->append('\\');		/* This gives better readability */
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      res->append('r');
      break;
    case '\\':
      res->append('\\');		/* Because of the sql syntax */
      res->append('\\');
      break;
    case '\'':
      res->append('\'');		/* Because of the sql syntax */
      res->append('\'');
      break;
    default:
      res->append(*pos);
      break;
    }
  }
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  res->append('\'');
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}

	/* Create a .frm file */

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File create_frm(THD *thd, const char *name, const char *db,
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                const char *table, uint reclength, uchar *fileinfo,
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  		HA_CREATE_INFO *create_info, uint keys)
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{
  register File file;
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  uint key_length;
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  ulong length;
  char fill[IO_SIZE];
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  int create_flags= O_RDWR | O_TRUNC;

  if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
    create_flags|= O_EXCL | O_NOFOLLOW;
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  /* Fix this when we have new .frm files;  Current limit is 4G rows (QQ) */
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  if (create_info->max_rows > UINT_MAX32)
    create_info->max_rows= UINT_MAX32;
  if (create_info->min_rows > UINT_MAX32)
    create_info->min_rows= UINT_MAX32;
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  /*
    Ensure that raid_chunks can't be larger than 255, as this would cause
    problems with drop database
  */
  set_if_smaller(create_info->raid_chunks, 255);
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  if ((file= my_create(name, CREATE_MODE, create_flags, MYF(0))) >= 0)
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  {
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    uint key_length, tmp_key_length;
    uint tmp;
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    bzero((char*) fileinfo,64);
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    /* header */
    fileinfo[0]=(uchar) 254;
    fileinfo[1]= 1;
    fileinfo[2]= FRM_VER+3+ test(create_info->varchar);

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    fileinfo[3]= (uchar) ha_legacy_type(
          ha_checktype(thd,ha_legacy_type(create_info->db_type),0,0));
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    fileinfo[4]=1;
    int2store(fileinfo+6,IO_SIZE);		/* Next block starts here */
    key_length=keys*(7+NAME_LEN+MAX_REF_PARTS*9)+16;
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    length= next_io_size((ulong) (IO_SIZE+key_length+reclength+
                                  create_info->extra_size));
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    int4store(fileinfo+10,length);
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    tmp_key_length= (key_length < 0xffff) ? key_length : 0xffff;
    int2store(fileinfo+14,tmp_key_length);
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    int2store(fileinfo+16,reclength);
    int4store(fileinfo+18,create_info->max_rows);
    int4store(fileinfo+22,create_info->min_rows);
    fileinfo[27]=2;				// Use long pack-fields
    create_info->table_options|=HA_OPTION_LONG_BLOB_PTR; // Use portable blob pointers
    int2store(fileinfo+30,create_info->table_options);
    fileinfo[32]=0;				// No filename anymore
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    fileinfo[33]=5;                             // Mark for 5.0 frm file
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    int4store(fileinfo+34,create_info->avg_row_length);
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    fileinfo[38]= (create_info->default_table_charset ?
		   create_info->default_table_charset->number : 0);
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    fileinfo[40]= (uchar) create_info->row_type;
    fileinfo[41]= (uchar) create_info->raid_type;
    fileinfo[42]= (uchar) create_info->raid_chunks;
    int4store(fileinfo+43,create_info->raid_chunksize);
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    int4store(fileinfo+47, key_length);
    tmp= MYSQL_VERSION_ID;          // Store to avoid warning from int4store
    int4store(fileinfo+51, tmp);
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    int2store(fileinfo+55, create_info->extra_size);
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    bzero(fill,IO_SIZE);
    for (; length > IO_SIZE ; length-= IO_SIZE)
    {
      if (my_write(file,(byte*) fill,IO_SIZE,MYF(MY_WME | MY_NABP)))
      {
	VOID(my_close(file,MYF(0)));
	VOID(my_delete(name,MYF(0)));
	return(-1);
      }
    }
  }
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  else
  {
    if (my_errno == ENOENT)
      my_error(ER_BAD_DB_ERROR,MYF(0),db);
    else
      my_error(ER_CANT_CREATE_TABLE,MYF(0),table,my_errno);
  }
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  return (file);
} /* create_frm */


void update_create_info_from_table(HA_CREATE_INFO *create_info, TABLE *table)
{
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  TABLE_SHARE *share= table->s;
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  DBUG_ENTER("update_create_info_from_table");
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  create_info->max_rows= share->max_rows;
  create_info->min_rows= share->min_rows;
  create_info->table_options= share->db_create_options;
  create_info->avg_row_length= share->avg_row_length;
  create_info->row_type= share->row_type;
  create_info->raid_type= share->raid_type;
  create_info->raid_chunks= share->raid_chunks;
  create_info->raid_chunksize= share->raid_chunksize;
  create_info->default_table_charset= share->table_charset;
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  create_info->table_charset= 0;
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  DBUG_VOID_RETURN;
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}
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int
rename_file_ext(const char * from,const char * to,const char * ext)
{
  char from_b[FN_REFLEN],to_b[FN_REFLEN];
  VOID(strxmov(from_b,from,ext,NullS));
  VOID(strxmov(to_b,to,ext,NullS));
  return (my_rename(from_b,to_b,MYF(MY_WME)));
}


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/*
  Allocate string field in MEM_ROOT and return it as String

  SYNOPSIS
    get_field()
    mem   	MEM_ROOT for allocating
    field 	Field for retrieving of string
    res         result String

  RETURN VALUES
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    1   string is empty
    0	all ok
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*/

bool get_field(MEM_ROOT *mem, Field *field, String *res)
{
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  char buff[MAX_FIELD_WIDTH], *to;
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  String str(buff,sizeof(buff),&my_charset_bin);
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  uint length;

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  field->val_str(&str);
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  if (!(length= str.length()))
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  {
    res->length(0);
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    return 1;
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  }
  if (!(to= strmake_root(mem, str.ptr(), length)))
    length= 0;                                  // Safety fix
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  res->set(to, length, ((Field_str*)field)->charset());
  return 0;
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}

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/*
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  Allocate string field in MEM_ROOT and return it as NULL-terminated string

  SYNOPSIS
    get_field()
    mem   	MEM_ROOT for allocating
    field 	Field for retrieving of string

  RETURN VALUES
    NullS  string is empty
    #      pointer to NULL-terminated string value of field
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*/

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char *get_field(MEM_ROOT *mem, Field *field)
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{
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  char buff[MAX_FIELD_WIDTH], *to;
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  String str(buff,sizeof(buff),&my_charset_bin);
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  uint length;

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  field->val_str(&str);
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  length= str.length();
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  if (!length || !(to= (char*) alloc_root(mem,length+1)))
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    return NullS;
  memcpy(to,str.ptr(),(uint) length);
  to[length]=0;
  return to;
}

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/*
  Check if database name is valid

  SYNPOSIS
    check_db_name()
    name		Name of database

  NOTES
    If lower_case_table_names is set then database is converted to lower case

  RETURN
    0	ok
    1   error
*/

bool check_db_name(char *name)
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{
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  char *start=name;
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  /* Used to catch empty names and names with end space */
  bool last_char_is_space= TRUE;
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  if (lower_case_table_names && name != any_db)
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    my_casedn_str(files_charset_info, name);
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  while (*name)
  {
#if defined(USE_MB) && defined(USE_MB_IDENT)
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    last_char_is_space= my_isspace(default_charset_info, *name);
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    if (use_mb(system_charset_info))
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    {
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      int len=my_ismbchar(system_charset_info, name, 
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                          name+system_charset_info->mbmaxlen);
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      if (len)
      {
        name += len;
        continue;
      }
    }
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#else
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    last_char_is_space= *name==' ';
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#endif
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    if (*name == '/' || *name == '\\' || *name == FN_LIBCHAR ||
	*name == FN_EXTCHAR)
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      return 1;
    name++;
  }
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  return last_char_is_space || (uint) (name - start) > NAME_LEN;
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}


/*
  Allow anything as a table name, as long as it doesn't contain an
  a '/', or a '.' character
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  or ' ' at the end
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  returns 1 on error
*/


bool check_table_name(const char *name, uint length)
{
  const char *end= name+length;
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  if (!length || length > NAME_LEN)
    return 1;
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#if defined(USE_MB) && defined(USE_MB_IDENT)
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  bool last_char_is_space= FALSE;
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#else
  if (name[length-1]==' ')
    return 1;
#endif
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  while (name != end)
  {
#if defined(USE_MB) && defined(USE_MB_IDENT)
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    last_char_is_space= my_isspace(default_charset_info, *name);
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    if (use_mb(system_charset_info))
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    {
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      int len=my_ismbchar(system_charset_info, name, end);
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      if (len)
      {
        name += len;
        continue;
      }
    }
#endif
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    if (*name == '/' || *name == '\\' || *name == FN_EXTCHAR)
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      return 1;
    name++;
  }
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#if defined(USE_MB) && defined(USE_MB_IDENT)
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  return last_char_is_space;
#else
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  return 0;
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#endif
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}

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bool check_column_name(const char *name)
{
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  const char *start= name;
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  bool last_char_is_space= TRUE;
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  while (*name)
  {
#if defined(USE_MB) && defined(USE_MB_IDENT)
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    last_char_is_space= my_isspace(default_charset_info, *name);
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    if (use_mb(system_charset_info))
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    {
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      int len=my_ismbchar(system_charset_info, name, 
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                          name+system_charset_info->mbmaxlen);
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      if (len)
      {
        name += len;
        continue;
      }
    }
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#else
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    last_char_is_space= *name==' ';
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#endif
    if (*name == NAMES_SEP_CHAR)
      return 1;
    name++;
  }
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  /* Error if empty or too long column name */
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  return last_char_is_space || (uint) (name - start) > NAME_LEN;
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}

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/*
  Create Item_field for each column in the table.

  SYNPOSIS
    st_table::fill_item_list()
      item_list          a pointer to an empty list used to store items

  DESCRIPTION
    Create Item_field object for each column in the table and
    initialize it with the corresponding Field. New items are
    created in the current THD memory root.

  RETURN VALUE
    0                    success
    1                    out of memory
*/

bool st_table::fill_item_list(List<Item> *item_list) const
{
  /*
    All Item_field's created using a direct pointer to a field
    are fixed in Item_field constructor.
  */
  for (Field **ptr= field; *ptr; ptr++)
  {
    Item_field *item= new Item_field(*ptr);
    if (!item || item_list->push_back(item))
      return TRUE;
  }
  return FALSE;
}

/*
  Reset an existing list of Item_field items to point to the
  Fields of this table.

  SYNPOSIS
    st_table::fill_item_list()
      item_list          a non-empty list with Item_fields

  DESCRIPTION
    This is a counterpart of fill_item_list used to redirect
    Item_fields to the fields of a newly created table.
    The caller must ensure that number of items in the item_list
    is the same as the number of columns in the table.
*/

void st_table::reset_item_list(List<Item> *item_list) const
{
  List_iterator_fast<Item> it(*item_list);
  for (Field **ptr= field; *ptr; ptr++)
  {
    Item_field *item_field= (Item_field*) it++;
    DBUG_ASSERT(item_field != 0);
    item_field->reset_field(*ptr);
  }
}
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/*
  calculate md5 of query

  SYNOPSIS
    st_table_list::calc_md5()
    buffer	buffer for md5 writing
*/
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void  st_table_list::calc_md5(char *buffer)
{
  my_MD5_CTX context;
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  uchar digest[16];
  my_MD5Init(&context);
  my_MD5Update(&context,(uchar *) query.str, query.length);
  my_MD5Final(digest, &context);
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  sprintf((char *) buffer,
	    "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
	    digest[0], digest[1], digest[2], digest[3],
	    digest[4], digest[5], digest[6], digest[7],
	    digest[8], digest[9], digest[10], digest[11],
	    digest[12], digest[13], digest[14], digest[15]);
}


/*
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  set underlying TABLE for table place holder of VIEW
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  DESCRIPTION
    Replace all views that only uses one table with the table itself.
    This allows us to treat the view as a simple table and even update
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    it (it is a kind of optimisation)
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  SYNOPSIS
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    st_table_list::set_underlying_merge()
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*/
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void st_table_list::set_underlying_merge()
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{
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  TABLE_LIST *tbl;

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  if ((tbl= merge_underlying_list))
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  {
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    /* This is a view. Process all tables of view */
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    DBUG_ASSERT(view && effective_algorithm == VIEW_ALGORITHM_MERGE);
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    do
    {
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      if (tbl->merge_underlying_list)          // This is a view
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      {
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        DBUG_ASSERT(tbl->view &&
                    tbl->effective_algorithm == VIEW_ALGORITHM_MERGE);
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        /*
          This is the only case where set_ancestor is called on an object
          that may not be a view (in which case ancestor is 0)
        */
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        tbl->merge_underlying_list->set_underlying_merge();
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      }
    } while ((tbl= tbl->next_local));

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    if (!multitable_view)
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    {
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      table= merge_underlying_list->table;
      schema_table= merge_underlying_list->schema_table;
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    }
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  }
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}


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/*
  setup fields of placeholder of merged VIEW

  SYNOPSIS
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    st_table_list::setup_underlying()
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    thd		    - thread handler
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  DESCRIPTION
    It is:
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    - preparing translation table for view columns
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    If there are underlying view(s) procedure first will be called for them.

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  RETURN
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    FALSE - OK
    TRUE  - error
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*/
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bool st_table_list::setup_underlying(THD *thd)
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{
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  DBUG_ENTER("st_table_list::setup_underlying");

  if (!field_translation && merge_underlying_list)
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  {
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    Field_translator *transl;
    SELECT_LEX *select= &view->select_lex;
    Item *item;
    TABLE_LIST *tbl;
    List_iterator_fast<Item> it(select->item_list);
    uint field_count= 0;

    if (check_stack_overrun(thd, STACK_MIN_SIZE, (char *)&field_count))
    {
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      DBUG_RETURN(TRUE);
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    }
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    for (tbl= merge_underlying_list; tbl; tbl= tbl->next_local)
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    {
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      if (tbl->merge_underlying_list &&
          tbl->setup_underlying(thd))
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      {
        DBUG_RETURN(TRUE);
      }
    }
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    /* Create view fields translation table */

    if (!(transl=
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          (Field_translator*)(thd->stmt_arena->
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                              alloc(select->item_list.elements *
                                    sizeof(Field_translator)))))
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    {
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      DBUG_RETURN(TRUE);
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    }
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    while ((item= it++))
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    {
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      transl[field_count].name= item->name;
      transl[field_count++].item= item;
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    }
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    field_translation= transl;
    field_translation_end= transl + field_count;
    /* TODO: use hash for big number of fields */
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    /* full text function moving to current select */
    if (view->select_lex.ftfunc_list->elements)
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    {
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      Item_func_match *ifm;
      SELECT_LEX *current_select= thd->lex->current_select;
      List_iterator_fast<Item_func_match>
        li(*(view->select_lex.ftfunc_list));
      while ((ifm= li++))
        current_select->ftfunc_list->push_front(ifm);
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    }
  }
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  DBUG_RETURN(FALSE);
}
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/*
  Prepare where expression of view
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  SYNOPSIS
    st_table_list::prep_where()
    thd             - thread handler
    conds           - condition of this JOIN
    no_where_clause - do not build WHERE or ON outer qwery do not need it
                      (it is INSERT), we do not need conds if this flag is set
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  NOTE: have to be called befor CHECK OPTION preparation, because it makes
  fix_fields for view WHERE clause
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  RETURN
    FALSE - OK
    TRUE  - error
*/
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bool st_table_list::prep_where(THD *thd, Item **conds,
                               bool no_where_clause)
{
  DBUG_ENTER("st_table_list::prep_where");

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  for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local)
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  {
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    if (tbl->view && tbl->prep_where(thd, conds, no_where_clause))
    {
      DBUG_RETURN(TRUE);
    }
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  }
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  if (where)
  {
    if (!where->fixed && where->fix_fields(thd, &where))
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    {
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      DBUG_RETURN(TRUE);
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    }
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    /*
      check that it is not VIEW in which we insert with INSERT SELECT
      (in this case we can't add view WHERE condition to main SELECT_LEX)
    */
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    if (!no_where_clause && !where_processed)
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    {
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      TABLE_LIST *tbl= this;
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      Query_arena *arena= thd->stmt_arena, backup;
      arena= thd->activate_stmt_arena_if_needed(&backup);  // For easier test
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      /* Go up to join tree and try to find left join */
      for (; tbl; tbl= tbl->embedding)
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      {
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        if (tbl->outer_join)
        {
          /*
            Store WHERE condition to ON expression for outer join, because
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            we can't use WHERE to correctly execute left joins on VIEWs and
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            this expression will not be moved to WHERE condition (i.e. will
            be clean correctly for PS/SP)
          */
          tbl->on_expr= and_conds(tbl->on_expr, where);
          break;
        }
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      }
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      if (tbl == 0)
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        *conds= and_conds(*conds, where);
      if (arena)
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        thd->restore_active_arena(arena, &backup);
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      where_processed= TRUE;
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    }
  }
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  DBUG_RETURN(FALSE);
}


/*
  Prepare check option expression of table

  SYNOPSIS
    st_table_list::prep_check_option()
    thd             - thread handler
    check_opt_type  - WITH CHECK OPTION type (VIEW_CHECK_NONE,
                      VIEW_CHECK_LOCAL, VIEW_CHECK_CASCADED)
                      we use this parameter instead of direct check of
                      effective_with_check to change type of underlying
                      views to VIEW_CHECK_CASCADED if outer view have
                      such option and prevent processing of underlying
                      view check options if outer view have just
                      VIEW_CHECK_LOCAL option.

  NOTE
    This method build check options for every call
    (usual execution or every SP/PS call)
    This method have to be called after WHERE preparation
    (st_table_list::prep_where)
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  RETURN
    FALSE - OK
    TRUE  - error
*/

bool st_table_list::prep_check_option(THD *thd, uint8 check_opt_type)
{
  DBUG_ENTER("st_table_list::prep_check_option");

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  for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local)
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  {
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    /* see comment of check_opt_type parameter */
    if (tbl->view &&
        tbl->prep_check_option(thd,
                               ((check_opt_type == VIEW_CHECK_CASCADED) ?
                                VIEW_CHECK_CASCADED :
                                VIEW_CHECK_NONE)))
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    {
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      DBUG_RETURN(TRUE);
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    }
  }
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  if (check_opt_type)
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  {
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    Item *item= 0;
    if (where)
    {
      DBUG_ASSERT(where->fixed);
      item= where->copy_andor_structure(thd);
    }
    if (check_opt_type == VIEW_CHECK_CASCADED)
    {
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      for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local)
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      {
        if (tbl->check_option)
          item= and_conds(item, tbl->check_option);
      }
    }
    if (item)
      thd->change_item_tree(&check_option, item);
  }

  if (check_option)
  {
    const char *save_where= thd->where;
    thd->where= "check option";
    if (!check_option->fixed &&
        check_option->fix_fields(thd, &check_option) ||
        check_option->check_cols(1))
    {
      DBUG_RETURN(TRUE);
    }
    thd->where= save_where;
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  }
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  DBUG_RETURN(FALSE);
}

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/*
  Hide errors which show view underlying table information

  SYNOPSIS
    st_table_list::hide_view_error()
    thd     thread handler
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*/

void st_table_list::hide_view_error(THD *thd)
{
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  /* Hide "Unknown column" or "Unknown function" error */
  if (thd->net.last_errno == ER_BAD_FIELD_ERROR ||
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      thd->net.last_errno == ER_SP_DOES_NOT_EXIST ||
      thd->net.last_errno == ER_PROCACCESS_DENIED_ERROR ||
      thd->net.last_errno == ER_COLUMNACCESS_DENIED_ERROR)
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  {
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    TABLE_LIST *top= top_table();
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    thd->clear_error();
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    my_error(ER_VIEW_INVALID, MYF(0), top->view_db.str, top->view_name.str);
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  }
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  else if (thd->net.last_errno == ER_NO_DEFAULT_FOR_FIELD)
  {
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    TABLE_LIST *top= top_table();
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    thd->clear_error();
    // TODO: make correct error message
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    my_error(ER_NO_DEFAULT_FOR_VIEW_FIELD, MYF(0),
             top->view_db.str, top->view_name.str);
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  }
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}


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/*
  Find underlying base tables (TABLE_LIST) which represent given
  table_to_find (TABLE)

  SYNOPSIS
    st_table_list::find_underlying_table()
    table_to_find table to find

  RETURN
    0  table is not found
    found table reference
*/

st_table_list *st_table_list::find_underlying_table(TABLE *table_to_find)
{
  /* is this real table and table which we are looking for? */
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  if (table == table_to_find && merge_underlying_list == 0)
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    return this;

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  for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local)
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  {
    TABLE_LIST *result;
    if ((result= tbl->find_underlying_table(table_to_find)))
      return result;
  }
  return 0;
}

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/*
  cleunup items belonged to view fields translation table

  SYNOPSIS
    st_table_list::cleanup_items()
*/

void st_table_list::cleanup_items()
{
  if (!field_translation)
    return;

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  for (Field_translator *transl= field_translation;
       transl < field_translation_end;
       transl++)
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    transl->item->walk(&Item::cleanup_processor, 0);
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}


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/*
  check CHECK OPTION condition

  SYNOPSIS
    check_option()
    ignore_failure ignore check option fail

  RETURN
    VIEW_CHECK_OK     OK
    VIEW_CHECK_ERROR  FAILED
    VIEW_CHECK_SKIP   FAILED, but continue
*/

int st_table_list::view_check_option(THD *thd, bool ignore_failure)
{
  if (check_option && check_option->val_int() == 0)
  {
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    TABLE_LIST *view= top_table();
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    if (ignore_failure)
    {
      push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
                          ER_VIEW_CHECK_FAILED, ER(ER_VIEW_CHECK_FAILED),
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                          view->view_db.str, view->view_name.str);
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      return(VIEW_CHECK_SKIP);
    }
    else
    {
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      my_error(ER_VIEW_CHECK_FAILED, MYF(0), view->view_db.str, view->view_name.str);
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      return(VIEW_CHECK_ERROR);
    }
  }
  return(VIEW_CHECK_OK);
}


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/*
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  Find table in underlying tables by mask and check that only this
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  table belong to given mask
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  SYNOPSIS
    st_table_list::check_single_table()
    table	reference on variable where to store found table
		(should be 0 on call, to find table, or point to table for
		unique test)
    map         bit mask of tables
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    view        view for which we are looking table
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  RETURN
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    FALSE table not found or found only one
    TRUE  found several tables
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*/

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bool st_table_list::check_single_table(st_table_list **table, table_map map,
                                       st_table_list *view)
2681
{
2682
  for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local)
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  {
    if (tbl->table)
    {
      if (tbl->table->map & map)
      {
	if (*table)
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	  return TRUE;
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        *table= tbl;
        tbl->check_option= view->check_option;
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      }
    }
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    else if (tbl->check_single_table(table, map, view))
      return TRUE;
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  }
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  return FALSE;
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}


/*
  Set insert_values buffer

  SYNOPSIS
    set_insert_values()
    mem_root   memory pool for allocating

  RETURN
    FALSE - OK
    TRUE  - out of memory
*/

bool st_table_list::set_insert_values(MEM_ROOT *mem_root)
{
  if (table)
  {
    if (!table->insert_values &&
        !(table->insert_values= (byte *)alloc_root(mem_root,
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                                                   table->s->rec_buff_length)))
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      return TRUE;
  }
  else
  {
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    DBUG_ASSERT(view && merge_underlying_list);
    for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local)
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      if (tbl->set_insert_values(mem_root))
        return TRUE;
  }
  return FALSE;
}


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/*
  Test if this is a leaf with respect to name resolution.

  SYNOPSIS
    st_table_list::is_leaf_for_name_resolution()

  DESCRIPTION
    A table reference is a leaf with respect to name resolution if
    it is either a leaf node in a nested join tree (table, view,
    schema table, subquery), or an inner node that represents a
    NATURAL/USING join, or a nested join with materialized join
    columns.

  RETURN
    TRUE if a leaf, FALSE otherwise.
*/
bool st_table_list::is_leaf_for_name_resolution()
{
  return (view || is_natural_join || is_join_columns_complete ||
          !nested_join);
}


/*
  Retrieve the first (left-most) leaf in a nested join tree with
  respect to name resolution.

  SYNOPSIS
    st_table_list::first_leaf_for_name_resolution()

  DESCRIPTION
    Given that 'this' is a nested table reference, recursively walk
    down the left-most children of 'this' until we reach a leaf
    table reference with respect to name resolution.

  IMPLEMENTATION
    The left-most child of a nested table reference is the last element
    in the list of children because the children are inserted in
    reverse order.

  RETURN
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    If 'this' is a nested table reference - the left-most child of
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      the tree rooted in 'this',
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    else return 'this'
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*/

TABLE_LIST *st_table_list::first_leaf_for_name_resolution()
{
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  TABLE_LIST *cur_table_ref;
  NESTED_JOIN *cur_nested_join;
  LINT_INIT(cur_table_ref);
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  if (is_leaf_for_name_resolution())
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    return this;
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  DBUG_ASSERT(nested_join);
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  for (cur_nested_join= nested_join;
       cur_nested_join;
       cur_nested_join= cur_table_ref->nested_join)
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  {
    List_iterator_fast<TABLE_LIST> it(cur_nested_join->join_list);
    cur_table_ref= it++;
    /*
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      If the current nested join is a RIGHT JOIN, the operands in
      'join_list' are in reverse order, thus the first operand is
      already at the front of the list. Otherwise the first operand
      is in the end of the list of join operands.
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    */
    if (!(cur_table_ref->outer_join & JOIN_TYPE_RIGHT))
    {
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      TABLE_LIST *next;
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      while ((next= it++))
        cur_table_ref= next;
    }
    if (cur_table_ref->is_leaf_for_name_resolution())
      break;
  }
  return cur_table_ref;
}


/*
  Retrieve the last (right-most) leaf in a nested join tree with
  respect to name resolution.

  SYNOPSIS
    st_table_list::last_leaf_for_name_resolution()

  DESCRIPTION
    Given that 'this' is a nested table reference, recursively walk
    down the right-most children of 'this' until we reach a leaf
    table reference with respect to name resolution.

  IMPLEMENTATION
    The right-most child of a nested table reference is the first
    element in the list of children because the children are inserted
    in reverse order.

  RETURN
    - If 'this' is a nested table reference - the right-most child of
      the tree rooted in 'this',
    - else - 'this'
*/

TABLE_LIST *st_table_list::last_leaf_for_name_resolution()
{
  TABLE_LIST *cur_table_ref= this;
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  NESTED_JOIN *cur_nested_join;
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  if (is_leaf_for_name_resolution())
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    return this;
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  DBUG_ASSERT(nested_join);
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  for (cur_nested_join= nested_join;
       cur_nested_join;
       cur_nested_join= cur_table_ref->nested_join)
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  {
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    cur_table_ref= cur_nested_join->join_list.head();
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    /*
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      If the current nested is a RIGHT JOIN, the operands in
      'join_list' are in reverse order, thus the last operand is in the
      end of the list.
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    */
    if ((cur_table_ref->outer_join & JOIN_TYPE_RIGHT))
    {
      List_iterator_fast<TABLE_LIST> it(cur_nested_join->join_list);
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      TABLE_LIST *next;
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      cur_table_ref= it++;
      while ((next= it++))
        cur_table_ref= next;
    }
    if (cur_table_ref->is_leaf_for_name_resolution())
      break;
  }
  return cur_table_ref;
}


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/*
  Register access mode which we need for underlying tables

  SYNOPSIS
    register_want_access()
    want_access          Acess which we require
*/

void st_table_list::register_want_access(ulong want_access)
{
  /* Remove SHOW_VIEW_ACL, because it will be checked during making view */
  want_access&= ~SHOW_VIEW_ACL;
  if (belong_to_view)
  {
    grant.want_privilege= want_access;
    if (table)
      table->grant.want_privilege= want_access;
  }
  for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local)
    tbl->register_want_access(want_access);
}


/*
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  Load security context information for this view
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  SYNOPSIS
    st_table_list::prepare_view_securety_context()
    thd                  [in] thread handler

  RETURN
    FALSE  OK
    TRUE   Error
*/

#ifndef NO_EMBEDDED_ACCESS_CHECKS
bool st_table_list::prepare_view_securety_context(THD *thd)
{
  DBUG_ENTER("st_table_list::prepare_view_securety_context");
  DBUG_PRINT("enter", ("table: %s", alias));

  DBUG_ASSERT(!prelocking_placeholder && view);
  if (view_suid)
  {
    DBUG_PRINT("info", ("This table is suid view => load contest"));
    DBUG_ASSERT(view && view_sctx);
    if (acl_getroot_no_password(view_sctx,
                                definer.user.str,
                                definer.host.str,
                                definer.host.str,
                                thd->db))
    {
      my_error(ER_NO_SUCH_USER, MYF(0), definer.user.str, definer.host.str);
      DBUG_RETURN(TRUE);
    }
  }
  DBUG_RETURN(FALSE);
}
#endif


/*
  Find security context of current view

  SYNOPSIS
    st_table_list::find_view_security_context()
    thd                  [in] thread handler

*/

#ifndef NO_EMBEDDED_ACCESS_CHECKS
Security_context *st_table_list::find_view_security_context(THD *thd)
{
  Security_context *sctx;
  TABLE_LIST *upper_view= this;
  DBUG_ENTER("st_table_list::find_view_security_context");

  DBUG_ASSERT(view);
  while (upper_view && !upper_view->view_suid)
  {
    DBUG_ASSERT(!upper_view->prelocking_placeholder);
    upper_view= upper_view->referencing_view;
  }
  if (upper_view)
  {
    DBUG_PRINT("info", ("Securety context of view %s will be used",
                        upper_view->alias));
    sctx= upper_view->view_sctx;
    DBUG_ASSERT(sctx);
  }
  else
  {
    DBUG_PRINT("info", ("Current global context will be used"));
    sctx= thd->security_ctx;
  }
  DBUG_RETURN(sctx);
}
#endif


/*
  Prepare security context and load underlying tables priveleges for view

  SYNOPSIS
    st_table_list::prepare_security()
    thd                  [in] thread handler

  RETURN
    FALSE  OK
    TRUE   Error
*/

bool st_table_list::prepare_security(THD *thd)
{
  List_iterator_fast<TABLE_LIST> tb(*view_tables);
  TABLE_LIST *tbl;
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  DBUG_ENTER("st_table_list::prepare_security");
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  Security_context *save_security_ctx= thd->security_ctx;

  DBUG_ASSERT(!prelocking_placeholder);
  if (prepare_view_securety_context(thd))
    DBUG_RETURN(TRUE);
  thd->security_ctx= find_view_security_context(thd);
  while ((tbl= tb++))
  {
    DBUG_ASSERT(tbl->referencing_view);
    char *db, *table_name;
    if (tbl->view)
    {
      db= tbl->view_db.str;
      table_name= tbl->view_name.str;
    }
    else
    {
      db= tbl->db;
      table_name= tbl->table_name;
    }
    fill_effective_table_privileges(thd, &tbl->grant, db, table_name);
    if (tbl->table)
      tbl->table->grant= grant;
  }
  thd->security_ctx= save_security_ctx;
#else
  while ((tbl= tb++))
    tbl->grant.privilege= ~NO_ACCESS;
#endif
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  DBUG_RETURN(FALSE);
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}


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Natural_join_column::Natural_join_column(Field_translator *field_param,
                                         TABLE_LIST *tab)
{
  DBUG_ASSERT(tab->field_translation);
  view_field= field_param;
  table_field= NULL;
  table_ref= tab;
  is_common= FALSE;
}


Natural_join_column::Natural_join_column(Field *field_param,
                                         TABLE_LIST *tab)
{
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  DBUG_ASSERT(tab->table == field_param->table);
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  table_field= field_param;
  view_field= NULL;
  table_ref= tab;
  is_common= FALSE;
}


const char *Natural_join_column::name()
{
  if (view_field)
  {
    DBUG_ASSERT(table_field == NULL);
    return view_field->name;
  }
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  return table_field->field_name;
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}


Item *Natural_join_column::create_item(THD *thd)
{
  if (view_field)
  {
    DBUG_ASSERT(table_field == NULL);
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    return create_view_field(thd, table_ref, &view_field->item,
                             view_field->name);
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  }
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  return new Item_field(thd, &thd->lex->current_select->context, table_field);
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}


Field *Natural_join_column::field()
{
  if (view_field)
  {
    DBUG_ASSERT(table_field == NULL);
    return NULL;
  }
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  return table_field;
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}


const char *Natural_join_column::table_name()
{
  return table_ref->alias;
}


const char *Natural_join_column::db_name()
{
  if (view_field)
    return table_ref->view_db.str;
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  DBUG_ASSERT(!strcmp(table_ref->db,
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                      table_ref->table->s->db.str));
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  return table_ref->db;
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}


GRANT_INFO *Natural_join_column::grant()
{
  if (view_field)
    return &(table_ref->grant);
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  return &(table_ref->table->grant);
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}


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void Field_iterator_view::set(TABLE_LIST *table)
{
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  DBUG_ASSERT(table->field_translation);
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  view= table;
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  ptr= table->field_translation;
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  array_end= table->field_translation_end;
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}


const char *Field_iterator_table::name()
{
  return (*ptr)->field_name;
}


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Item *Field_iterator_table::create_item(THD *thd)
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{
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  return new Item_field(thd, &thd->lex->current_select->context, *ptr);
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}


const char *Field_iterator_view::name()
{
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  return ptr->name;
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}


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Item *Field_iterator_view::create_item(THD *thd)
{
  return create_view_field(thd, view, &ptr->item, ptr->name);
}

Item *create_view_field(THD *thd, TABLE_LIST *view, Item **field_ref,
                        const char *name)
{
  bool save_wrapper= thd->lex->select_lex.no_wrap_view_item;
  Item *field= *field_ref;
  DBUG_ENTER("create_view_field");

  if (view->schema_table_reformed)
  {
    /*
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      Translation table items are always Item_fields and already fixed
      ('mysql_schema_table' function). So we can return directly the
      field. This case happens only for 'show & where' commands.
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    */
    DBUG_ASSERT(field && field->fixed);
    DBUG_RETURN(field);
  }

  DBUG_ASSERT(field);
  thd->lex->current_select->no_wrap_view_item= TRUE;
  if (!field->fixed)
  {
    if (field->fix_fields(thd, field_ref))
    {
      thd->lex->current_select->no_wrap_view_item= save_wrapper;
      DBUG_RETURN(0);
    }
    field= *field_ref;
  }
  thd->lex->current_select->no_wrap_view_item= save_wrapper;
  if (thd->lex->current_select->no_wrap_view_item)
  {
    DBUG_RETURN(field);
  }
  Item *item= new Item_direct_view_ref(&view->view->select_lex.context,
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                                       field_ref, view->alias,
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                                       name);
  DBUG_RETURN(item);
}


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void Field_iterator_natural_join::set(TABLE_LIST *table_ref)
{
  DBUG_ASSERT(table_ref->join_columns);
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  column_ref_it.init(*(table_ref->join_columns));
  cur_column_ref= column_ref_it++;
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}


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void Field_iterator_natural_join::next()
{
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  cur_column_ref= column_ref_it++;
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  DBUG_ASSERT(!cur_column_ref || ! cur_column_ref->table_field ||
              cur_column_ref->table_ref->table ==
              cur_column_ref->table_field->table);
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}


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void Field_iterator_table_ref::set_field_iterator()
{
  DBUG_ENTER("Field_iterator_table_ref::set_field_iterator");
  /*
    If the table reference we are iterating over is a natural join, or it is
    an operand of a natural join, and TABLE_LIST::join_columns contains all
    the columns of the join operand, then we pick the columns from
    TABLE_LIST::join_columns, instead of the  orginial container of the
    columns of the join operator.
  */
  if (table_ref->is_join_columns_complete)
  {
    /* Necesary, but insufficient conditions. */
    DBUG_ASSERT(table_ref->is_natural_join ||
                table_ref->nested_join ||
                table_ref->join_columns &&
                /* This is a merge view. */
                ((table_ref->field_translation &&
                  table_ref->join_columns->elements ==
                  (ulong)(table_ref->field_translation_end -
                          table_ref->field_translation)) ||
                 /* This is stored table or a tmptable view. */
                 (!table_ref->field_translation &&
                  table_ref->join_columns->elements ==
                  table_ref->table->s->fields)));
    field_it= &natural_join_it;
    DBUG_PRINT("info",("field_it for '%s' is Field_iterator_natural_join",
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                       table_ref->alias));
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  }
  /* This is a merge view, so use field_translation. */
  else if (table_ref->field_translation)
  {
    DBUG_ASSERT(table_ref->view &&
                table_ref->effective_algorithm == VIEW_ALGORITHM_MERGE);
    field_it= &view_field_it;
    DBUG_PRINT("info", ("field_it for '%s' is Field_iterator_view",
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                        table_ref->alias));
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  }
  /* This is a base table or stored view. */
  else
  {
    DBUG_ASSERT(table_ref->table || table_ref->view);
    field_it= &table_field_it;
    DBUG_PRINT("info", ("field_it for '%s' is Field_iterator_table",
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                        table_ref->alias));
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  }
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  field_it->set(table_ref);
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  DBUG_VOID_RETURN;
}


void Field_iterator_table_ref::set(TABLE_LIST *table)
{
  DBUG_ASSERT(table);
  first_leaf= table->first_leaf_for_name_resolution();
  last_leaf=  table->last_leaf_for_name_resolution();
  DBUG_ASSERT(first_leaf && last_leaf);
  table_ref= first_leaf;
  set_field_iterator();
}


void Field_iterator_table_ref::next()
{
  /* Move to the next field in the current table reference. */
  field_it->next();
  /*
    If all fields of the current table reference are exhausted, move to
    the next leaf table reference.
  */
  if (field_it->end_of_fields() && table_ref != last_leaf)
  {
    table_ref= table_ref->next_name_resolution_table;
    DBUG_ASSERT(table_ref);
    set_field_iterator();
  }
}


const char *Field_iterator_table_ref::table_name()
{
  if (table_ref->view)
    return table_ref->view_name.str;
  else if (table_ref->is_natural_join)
    return natural_join_it.column_ref()->table_name();
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  DBUG_ASSERT(!strcmp(table_ref->table_name,
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                      table_ref->table->s->table_name.str));
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  return table_ref->table_name;
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}


const char *Field_iterator_table_ref::db_name()
{
  if (table_ref->view)
    return table_ref->view_db.str;
  else if (table_ref->is_natural_join)
    return natural_join_it.column_ref()->db_name();
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  DBUG_ASSERT(!strcmp(table_ref->db, table_ref->table->s->db.str));
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  return table_ref->db;
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}


GRANT_INFO *Field_iterator_table_ref::grant()
{
  if (table_ref->view)
    return &(table_ref->grant);
  else if (table_ref->is_natural_join)
    return natural_join_it.column_ref()->grant();
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  return &(table_ref->table->grant);
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}


/*
  Create new or return existing column reference to a column of a
  natural/using join.

  SYNOPSIS
    Field_iterator_table_ref::get_or_create_column_ref()
    is_created  [out] set to TRUE if the column was created,
                      FALSE if we return an already created colum

  DESCRIPTION
    TODO

  RETURN
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    #     Pointer to a column of a natural join (or its operand)
    NULL  No memory to allocate the column
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*/

Natural_join_column *
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Field_iterator_table_ref::get_or_create_column_ref(bool *is_created)
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{
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  Natural_join_column *nj_col;

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  *is_created= TRUE;
  if (field_it == &table_field_it)
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  {
    /* The field belongs to a stored table. */
    Field *field= table_field_it.field();
    nj_col= new Natural_join_column(field, table_ref);
  }
  else if (field_it == &view_field_it)
  {
    /* The field belongs to a merge view or information schema table. */
    Field_translator *translated_field= view_field_it.field_translator();
    nj_col= new Natural_join_column(translated_field, table_ref);
  }
  else
  {
    /*
      The field belongs to a NATURAL join, therefore the column reference was
      already created via one of the two constructor calls above. In this case
      we just return the already created column reference.
    */
    *is_created= FALSE;
    nj_col= natural_join_it.column_ref();
    DBUG_ASSERT(nj_col);
  }
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  DBUG_ASSERT(!nj_col->table_field ||
              nj_col->table_ref->table == nj_col->table_field->table);
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  return nj_col;
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}


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/*
  Return an existing reference to a column of a natural/using join.

  SYNOPSIS
    Field_iterator_table_ref::get_natural_column_ref()

  DESCRIPTION
    The method should be called in contexts where it is expected that
    all natural join columns are already created, and that the column
    being retrieved is a Natural_join_column.

  RETURN
    #     Pointer to a column of a natural join (or its operand)
    NULL  No memory to allocate the column
*/

Natural_join_column *
Field_iterator_table_ref::get_natural_column_ref()
{
  Natural_join_column *nj_col;

  DBUG_ASSERT(field_it == &natural_join_it);
  /*
    The field belongs to a NATURAL join, therefore the column reference was
    already created via one of the two constructor calls above. In this case
    we just return the already created column reference.
  */
  nj_col= natural_join_it.column_ref();
  DBUG_ASSERT(nj_col &&
              (!nj_col->table_field ||
               nj_col->table_ref->table == nj_col->table_field->table));
  return nj_col;
}


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/*****************************************************************************
** Instansiate templates
*****************************************************************************/

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#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
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template class List<String>;
template class List_iterator<String>;
#endif