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/* Copyright (C) 2000-2005 MySQL AB & Innobase Oy
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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
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   the Free Software Foundation; version 2 of the License.
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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 */

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/* This file defines the InnoDB handler: the interface between MySQL and InnoDB
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NOTE: You can only use noninlined InnoDB functions in this file, because we
have disables the InnoDB inlining in this file. */
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/* TODO list for the InnoDB handler in 5.0:
  - Remove the flag trx->active_trans and look at the InnoDB
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    trx struct state field
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  - fix savepoint functions to use savepoint storage area
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  - Find out what kind of problems the OS X case-insensitivity causes to
    table and database names; should we 'normalize' the names like we do
    in Windows?
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*/
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#ifdef USE_PRAGMA_IMPLEMENTATION
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#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
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#include "slave.h"
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#ifdef HAVE_INNOBASE_DB
#include <m_ctype.h>
#include <hash.h>
#include <myisampack.h>
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#include <mysys_err.h>
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#include <my_sys.h>
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#define MAX_ULONG_BIT ((ulong) 1 << (sizeof(ulong)*8-1))

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#include "ha_innodb.h"
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pthread_mutex_t innobase_share_mutex, /* to protect innobase_open_files */
                prepare_commit_mutex; /* to force correct commit order in
				      binlog */
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ulong commit_threads= 0;
pthread_mutex_t commit_threads_m;
pthread_cond_t commit_cond;
pthread_mutex_t commit_cond_m;
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bool innodb_inited= 0;
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/*-----------------------------------------------------------------*/
/* These variables are used to implement (semi-)synchronous MySQL binlog
replication for InnoDB tables. */

pthread_cond_t  innobase_repl_cond;             /* Posix cond variable;
                                                this variable is signaled
                                                when enough binlog has been
                                                sent to slave, so that a
                                                waiting trx can return the
                                                'ok' message to the client
                                                for a commit */
pthread_mutex_t innobase_repl_cond_mutex;       /* Posix cond variable mutex
                                                that also protects the next
                                                innobase_repl_... variables */
uint            innobase_repl_state;            /* 1 if synchronous replication
                                                is switched on and is working
                                                ok; else 0 */
uint            innobase_repl_file_name_inited  = 0; /* This is set to 1 when
                                                innobase_repl_file_name
                                                contains meaningful data */
char*           innobase_repl_file_name;        /* The binlog name up to which
                                                we have sent some binlog to
                                                the slave */
my_off_t        innobase_repl_pos;              /* The position in that file
                                                up to which we have sent the
                                                binlog to the slave */
uint            innobase_repl_n_wait_threads    = 0; /* This tells how many
                                                transactions currently are
                                                waiting for the binlog to be
                                                sent to the client */
uint            innobase_repl_wait_file_name_inited = 0; /* This is set to 1
                                                when we know the 'smallest'
                                                wait position */
char*           innobase_repl_wait_file_name;   /* NULL, or the 'smallest'
                                                innobase_repl_file_name that
                                                a transaction is waiting for */
my_off_t        innobase_repl_wait_pos;         /* The smallest position in
                                                that file that a trx is
                                                waiting for: the trx can
                                                proceed and send an 'ok' to
                                                the client when MySQL has sent
                                                the binlog up to this position
                                                to the slave */
/*-----------------------------------------------------------------*/



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/* Store MySQL definition of 'byte': in Linux it is char while InnoDB
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uses unsigned char; the header univ.i which we include next defines
'byte' as a macro which expands to 'unsigned char' */

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typedef byte	mysql_byte;
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#define INSIDE_HA_INNOBASE_CC

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/* Include necessary InnoDB headers */
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extern "C" {
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#include "../innobase/include/univ.i"
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#include "../innobase/include/os0file.h"
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#include "../innobase/include/os0thread.h"
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#include "../innobase/include/srv0start.h"
#include "../innobase/include/srv0srv.h"
#include "../innobase/include/trx0roll.h"
#include "../innobase/include/trx0trx.h"
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#include "../innobase/include/trx0sys.h"
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#include "../innobase/include/mtr0mtr.h"
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#include "../innobase/include/row0ins.h"
#include "../innobase/include/row0mysql.h"
#include "../innobase/include/row0sel.h"
#include "../innobase/include/row0upd.h"
#include "../innobase/include/log0log.h"
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#include "../innobase/include/lock0lock.h"
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#include "../innobase/include/dict0crea.h"
#include "../innobase/include/btr0cur.h"
#include "../innobase/include/btr0btr.h"
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#include "../innobase/include/fsp0fsp.h"
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#include "../innobase/include/sync0sync.h"
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#include "../innobase/include/fil0fil.h"
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#include "../innobase/include/trx0xa.h"
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}

#define HA_INNOBASE_ROWS_IN_TABLE 10000 /* to get optimization right */
#define HA_INNOBASE_RANGE_COUNT	  100

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ulong 	innobase_large_page_size = 0;
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/* The default values for the following, type long or longlong, start-up
parameters are declared in mysqld.cc: */
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long innobase_mirrored_log_groups, innobase_log_files_in_group,
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     innobase_log_buffer_size, innobase_buffer_pool_awe_mem_mb,
     innobase_additional_mem_pool_size, innobase_file_io_threads,
     innobase_lock_wait_timeout, innobase_force_recovery,
     innobase_open_files;

longlong innobase_buffer_pool_size, innobase_log_file_size;
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/* The default values for the following char* start-up parameters
are determined in innobase_init below: */
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char*	innobase_data_home_dir			= NULL;
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char*	innobase_data_file_path 		= NULL;
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char*	innobase_log_group_home_dir		= NULL;
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char*	innobase_log_arch_dir			= NULL;/* unused */
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/* The following has a misleading name: starting from 4.0.5, this also
affects Windows: */
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char*	innobase_unix_file_flush_method		= NULL;

/* Below we have boolean-valued start-up parameters, and their default
values */

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ulong	innobase_fast_shutdown			= 1;
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my_bool innobase_log_archive			= FALSE;/* unused */
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my_bool innobase_use_doublewrite    = TRUE;
my_bool innobase_use_checksums      = TRUE;
my_bool innobase_use_large_pages    = FALSE;
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my_bool	innobase_use_native_aio			= FALSE;
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my_bool	innobase_file_per_table			= FALSE;
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my_bool innobase_locks_unsafe_for_binlog        = FALSE;
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my_bool innobase_rollback_on_timeout		= FALSE;
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my_bool innobase_create_status_file		= FALSE;
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static char *internal_innobase_data_file_path	= NULL;
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/* The following counter is used to convey information to InnoDB
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about server activity: in selects it is not sensible to call
srv_active_wake_master_thread after each fetch or search, we only do
it every INNOBASE_WAKE_INTERVAL'th step. */

#define INNOBASE_WAKE_INTERVAL	32
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ulong	innobase_active_counter	= 0;
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static HASH 	innobase_open_tables;
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#ifdef __NETWARE__  	/* some special cleanup for NetWare */
bool nw_panic = FALSE;
#endif

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static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
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			      my_bool not_used __attribute__((unused)));
static INNOBASE_SHARE *get_share(const char *table_name);
static void free_share(INNOBASE_SHARE *share);
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static int innobase_close_connection(THD* thd);
static int innobase_commit(THD* thd, bool all);
static int innobase_rollback(THD* thd, bool all);
static int innobase_rollback_to_savepoint(THD* thd, void *savepoint);
static int innobase_savepoint(THD* thd, void *savepoint);
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static int innobase_release_savepoint(THD* thd, void *savepoint);
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handlerton innobase_hton = {
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  "InnoDB",
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  SHOW_OPTION_YES,
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  "Supports transactions, row-level locking, and foreign keys",
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  DB_TYPE_INNODB,
  innobase_init,
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  0,				/* slot */
  sizeof(trx_named_savept_t),	/* savepoint size. TODO: use it */
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  innobase_close_connection,
  innobase_savepoint,
  innobase_rollback_to_savepoint,
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  innobase_release_savepoint,
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  innobase_commit,		/* commit */
  innobase_rollback,		/* rollback */
  innobase_xa_prepare,		/* prepare */
  innobase_xa_recover,		/* recover */
  innobase_commit_by_xid,	/* commit_by_xid */
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  innobase_rollback_by_xid,     /* rollback_by_xid */
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  innobase_create_cursor_view,
  innobase_set_cursor_view,
  innobase_close_cursor_view,
  HTON_NO_FLAGS
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};
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/*********************************************************************
Commits a transaction in an InnoDB database. */

void
innobase_commit_low(
/*================*/
	trx_t*	trx);	/* in: transaction handle */

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struct show_var_st innodb_status_variables[]= {
  {"buffer_pool_pages_data",
  (char*) &export_vars.innodb_buffer_pool_pages_data,     SHOW_LONG},
  {"buffer_pool_pages_dirty",
  (char*) &export_vars.innodb_buffer_pool_pages_dirty,    SHOW_LONG},
  {"buffer_pool_pages_flushed",
  (char*) &export_vars.innodb_buffer_pool_pages_flushed,  SHOW_LONG},
  {"buffer_pool_pages_free",
  (char*) &export_vars.innodb_buffer_pool_pages_free,     SHOW_LONG},
  {"buffer_pool_pages_latched",
  (char*) &export_vars.innodb_buffer_pool_pages_latched,  SHOW_LONG},
  {"buffer_pool_pages_misc",
  (char*) &export_vars.innodb_buffer_pool_pages_misc,     SHOW_LONG},
  {"buffer_pool_pages_total",
  (char*) &export_vars.innodb_buffer_pool_pages_total,    SHOW_LONG},
  {"buffer_pool_read_ahead_rnd",
  (char*) &export_vars.innodb_buffer_pool_read_ahead_rnd, SHOW_LONG},
  {"buffer_pool_read_ahead_seq",
  (char*) &export_vars.innodb_buffer_pool_read_ahead_seq, SHOW_LONG},
  {"buffer_pool_read_requests",
  (char*) &export_vars.innodb_buffer_pool_read_requests,  SHOW_LONG},
  {"buffer_pool_reads",
  (char*) &export_vars.innodb_buffer_pool_reads,          SHOW_LONG},
  {"buffer_pool_wait_free",
  (char*) &export_vars.innodb_buffer_pool_wait_free,      SHOW_LONG},
  {"buffer_pool_write_requests",
  (char*) &export_vars.innodb_buffer_pool_write_requests, SHOW_LONG},
  {"data_fsyncs",
  (char*) &export_vars.innodb_data_fsyncs,                SHOW_LONG},
  {"data_pending_fsyncs",
  (char*) &export_vars.innodb_data_pending_fsyncs,        SHOW_LONG},
  {"data_pending_reads",
  (char*) &export_vars.innodb_data_pending_reads,         SHOW_LONG},
  {"data_pending_writes",
  (char*) &export_vars.innodb_data_pending_writes,        SHOW_LONG},
  {"data_read",
  (char*) &export_vars.innodb_data_read,                  SHOW_LONG},
  {"data_reads",
  (char*) &export_vars.innodb_data_reads,                 SHOW_LONG},
  {"data_writes",
  (char*) &export_vars.innodb_data_writes,                SHOW_LONG},
  {"data_written",
  (char*) &export_vars.innodb_data_written,               SHOW_LONG},
  {"dblwr_pages_written",
  (char*) &export_vars.innodb_dblwr_pages_written,        SHOW_LONG},
  {"dblwr_writes",
  (char*) &export_vars.innodb_dblwr_writes,               SHOW_LONG},
  {"log_waits",
  (char*) &export_vars.innodb_log_waits,                  SHOW_LONG},
  {"log_write_requests",
  (char*) &export_vars.innodb_log_write_requests,         SHOW_LONG},
  {"log_writes",
  (char*) &export_vars.innodb_log_writes,                 SHOW_LONG},
  {"os_log_fsyncs",
  (char*) &export_vars.innodb_os_log_fsyncs,              SHOW_LONG},
  {"os_log_pending_fsyncs",
  (char*) &export_vars.innodb_os_log_pending_fsyncs,      SHOW_LONG},
  {"os_log_pending_writes",
  (char*) &export_vars.innodb_os_log_pending_writes,      SHOW_LONG},
  {"os_log_written",
  (char*) &export_vars.innodb_os_log_written,             SHOW_LONG},
  {"page_size",
  (char*) &export_vars.innodb_page_size,                  SHOW_LONG},
  {"pages_created",
  (char*) &export_vars.innodb_pages_created,              SHOW_LONG},
  {"pages_read",
  (char*) &export_vars.innodb_pages_read,                 SHOW_LONG},
  {"pages_written",
  (char*) &export_vars.innodb_pages_written,              SHOW_LONG},
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  {"row_lock_current_waits",
  (char*) &export_vars.innodb_row_lock_current_waits,     SHOW_LONG},
  {"row_lock_time",
  (char*) &export_vars.innodb_row_lock_time,              SHOW_LONGLONG},
  {"row_lock_time_avg",
  (char*) &export_vars.innodb_row_lock_time_avg,          SHOW_LONG},
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  {"row_lock_time_max",
  (char*) &export_vars.innodb_row_lock_time_max,          SHOW_LONG},
  {"row_lock_waits",
  (char*) &export_vars.innodb_row_lock_waits,             SHOW_LONG},
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  {"rows_deleted",
  (char*) &export_vars.innodb_rows_deleted,               SHOW_LONG},
  {"rows_inserted",
  (char*) &export_vars.innodb_rows_inserted,              SHOW_LONG},
  {"rows_read",
  (char*) &export_vars.innodb_rows_read,                  SHOW_LONG},
  {"rows_updated",
  (char*) &export_vars.innodb_rows_updated,               SHOW_LONG},
  {NullS, NullS, SHOW_LONG}};

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/* General functions */

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/**********************************************************************
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
inline
void
innodb_srv_conc_enter_innodb(
/*=========================*/
	trx_t*	trx)	/* in: transaction handle */
{
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	if (UNIV_LIKELY(!srv_thread_concurrency)) {
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		return;
	}

	srv_conc_enter_innodb(trx);
}

/**********************************************************************
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
inline
void
innodb_srv_conc_exit_innodb(
/*========================*/
	trx_t*	trx)	/* in: transaction handle */
{
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	if (UNIV_LIKELY(!srv_thread_concurrency)) {
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		return;
	}

	srv_conc_exit_innodb(trx);
}

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/**********************************************************************
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Releases possible search latch and InnoDB thread FIFO ticket. These should
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be released at each SQL statement end, and also when mysqld passes the
control to the client. It does no harm to release these also in the middle
of an SQL statement. */
inline
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void
innobase_release_stat_resources(
/*============================*/
	trx_t*	trx)	/* in: transaction object */
{
	if (trx->has_search_latch) {
		trx_search_latch_release_if_reserved(trx);
	}

	if (trx->declared_to_be_inside_innodb) {
		/* Release our possible ticket in the FIFO */

		srv_conc_force_exit_innodb(trx);
	}
}

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/************************************************************************
Call this function when mysqld passes control to the client. That is to
avoid deadlocks on the adaptive hash S-latch possibly held by thd. For more
documentation, see handler.cc. */

void
innobase_release_temporary_latches(
/*===============================*/
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        THD *thd)
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{
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	trx_t*	trx;

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	if (!innodb_inited) {
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		return;
	}

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	trx = (trx_t*) thd->ha_data[innobase_hton.slot];

	if (trx) {
        	innobase_release_stat_resources(trx);
	}
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}

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/************************************************************************
Increments innobase_active_counter and every INNOBASE_WAKE_INTERVALth
time calls srv_active_wake_master_thread. This function should be used
when a single database operation may introduce a small need for
server utility activity, like checkpointing. */
inline
void
innobase_active_small(void)
/*=======================*/
{
	innobase_active_counter++;

	if ((innobase_active_counter % INNOBASE_WAKE_INTERVAL) == 0) {
		srv_active_wake_master_thread();
	}
}

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/************************************************************************
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Converts an InnoDB error code to a MySQL error code and also tells to MySQL
about a possible transaction rollback inside InnoDB caused by a lock wait
timeout or a deadlock. */
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static
int
convert_error_code_to_mysql(
/*========================*/
			/* out: MySQL error code */
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	int	error,	/* in: InnoDB error code */
	THD*	thd)	/* in: user thread handle or NULL */
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{
	if (error == DB_SUCCESS) {

		return(0);

  	} else if (error == (int) DB_DUPLICATE_KEY) {

    		return(HA_ERR_FOUND_DUPP_KEY);

 	} else if (error == (int) DB_RECORD_NOT_FOUND) {

    		return(HA_ERR_NO_ACTIVE_RECORD);

 	} else if (error == (int) DB_ERROR) {

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    		return(-1); /* unspecified error */
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 	} else if (error == (int) DB_DEADLOCK) {
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 		/* Since we rolled back the whole transaction, we must
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 		tell it also to MySQL so that MySQL knows to empty the
 		cached binlog for this transaction */

 		if (thd) {
 			ha_rollback(thd);
 		}
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    		return(HA_ERR_LOCK_DEADLOCK);

 	} else if (error == (int) DB_LOCK_WAIT_TIMEOUT) {

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		/* Starting from 5.0.13, we let MySQL just roll back the
		latest SQL statement in a lock wait timeout. Previously, we
		rolled back the whole transaction. */
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		if (thd && row_rollback_on_timeout) {
			ha_rollback(thd);
		}

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   		return(HA_ERR_LOCK_WAIT_TIMEOUT);
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 	} else if (error == (int) DB_NO_REFERENCED_ROW) {

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    		return(HA_ERR_NO_REFERENCED_ROW);
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 	} else if (error == (int) DB_ROW_IS_REFERENCED) {

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    		return(HA_ERR_ROW_IS_REFERENCED);
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        } else if (error == (int) DB_CANNOT_ADD_CONSTRAINT) {
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    		return(HA_ERR_CANNOT_ADD_FOREIGN);
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        } else if (error == (int) DB_CANNOT_DROP_CONSTRAINT) {

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    		return(HA_ERR_ROW_IS_REFERENCED); /* TODO: This is a bit
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						misleading, a new MySQL error
						code should be introduced */
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        } else if (error == (int) DB_COL_APPEARS_TWICE_IN_INDEX) {

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    		return(HA_ERR_CRASHED);
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 	} else if (error == (int) DB_OUT_OF_FILE_SPACE) {

    		return(HA_ERR_RECORD_FILE_FULL);

 	} else if (error == (int) DB_TABLE_IS_BEING_USED) {

    		return(HA_ERR_WRONG_COMMAND);

 	} else if (error == (int) DB_TABLE_NOT_FOUND) {

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    		return(HA_ERR_NO_SUCH_TABLE);
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  	} else if (error == (int) DB_TOO_BIG_RECORD) {

    		return(HA_ERR_TO_BIG_ROW);
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  	} else if (error == (int) DB_CORRUPTION) {

    		return(HA_ERR_CRASHED);
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  	} else if (error == (int) DB_NO_SAVEPOINT) {

    		return(HA_ERR_NO_SAVEPOINT);
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  	} else if (error == (int) DB_LOCK_TABLE_FULL) {
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 		/* Since we rolled back the whole transaction, we must
 		tell it also to MySQL so that MySQL knows to empty the
 		cached binlog for this transaction */
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 		if (thd) {
 			ha_rollback(thd);
 		}
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    		return(HA_ERR_LOCK_TABLE_FULL);
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    	} else {
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    		return(-1);			// Unknown error
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    	}
}

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/*****************************************************************
If you want to print a thd that is not associated with the current thread,
you must call this function before reserving the InnoDB kernel_mutex, to
protect MySQL from setting thd->query NULL. If you print a thd of the current
thread, we know that MySQL cannot modify thd->query, and it is not necessary
to call this. Call innobase_mysql_end_print_arbitrary_thd() after you release
the kernel_mutex.
NOTE that /mysql/innobase/lock/lock0lock.c must contain the prototype for this
function! */
extern "C"
void
innobase_mysql_prepare_print_arbitrary_thd(void)
/*============================================*/
{
	VOID(pthread_mutex_lock(&LOCK_thread_count));
}

/*****************************************************************
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Releases the mutex reserved by innobase_mysql_prepare_print_arbitrary_thd().
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NOTE that /mysql/innobase/lock/lock0lock.c must contain the prototype for this
function! */
extern "C"
void
innobase_mysql_end_print_arbitrary_thd(void)
/*========================================*/
{
	VOID(pthread_mutex_unlock(&LOCK_thread_count));
}

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/*****************************************************************
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Prints info of a THD object (== user session thread) to the given file.
NOTE that /mysql/innobase/trx/trx0trx.c must contain the prototype for
this function! */
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extern "C"
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void
innobase_mysql_print_thd(
/*=====================*/
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	FILE*   f,		/* in: output stream */
	void*   input_thd,	/* in: pointer to a MySQL THD object */
	uint	max_query_len)	/* in: max query length to print, or 0 to
				   use the default max length */
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{
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	const THD*	thd;
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        const Security_context *sctx;
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	const char*	s;
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        thd = (const THD*) input_thd;
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        /* We probably want to have original user as part of debug output. */
        sctx = &thd->main_security_ctx;

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  	fprintf(f, "MySQL thread id %lu, query id %lu",
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		thd->thread_id, (ulong) thd->query_id);
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	if (sctx->host) {
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		putc(' ', f);
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		fputs(sctx->host, f);
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	}
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	if (sctx->ip) {
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		putc(' ', f);
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		fputs(sctx->ip, f);
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	}
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        if (sctx->user) {
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		putc(' ', f);
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		fputs(sctx->user, f);
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  	}

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	if ((s = thd->proc_info)) {
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		putc(' ', f);
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		fputs(s, f);
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	}
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	if ((s = thd->query)) {
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		/* 3100 is chosen because currently 3000 is the maximum
		   max_query_len we ever give this. */
		char	buf[3100];
		uint	len;

		/* If buf is too small, we dynamically allocate storage
		   in this. */
		char*	dyn_str = NULL;

		/* Points to buf or dyn_str. */
		char*	str = buf;
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		if (max_query_len == 0)
		{
			/* ADDITIONAL SAFETY: the default is to print at
			   most 300 chars to reduce the probability of a
			   seg fault if there is a race in
			   thd->query_length in MySQL; after May 14, 2004
			   probably no race any more, but better be
			   safe */
			max_query_len = 300;
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		}
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		len = min(thd->query_length, max_query_len);
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		if (len > (sizeof(buf) - 1))
		{
			dyn_str = my_malloc(len + 1, MYF(0));
			str = dyn_str;
		}

                /* Use strmake to reduce the timeframe for a race,
                   compared to fwrite() */
		len = (uint) (strmake(str, s, len) - str);
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		putc('\n', f);
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		fwrite(str, 1, len, f);

		if (dyn_str)
		{
			my_free(dyn_str, MYF(0));
		}
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	}
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	putc('\n', f);
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}

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/**********************************************************************
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Get the variable length bounds of the given character set.
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NOTE that the exact prototype of this function has to be in
/innobase/data/data0type.ic! */
extern "C"
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void
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innobase_get_cset_width(
/*====================*/
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	ulint	cset,		/* in: MySQL charset-collation code */
	ulint*	mbminlen,	/* out: minimum length of a char (in bytes) */
	ulint*	mbmaxlen)	/* out: maximum length of a char (in bytes) */
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{
	CHARSET_INFO*	cs;
	ut_ad(cset < 256);
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	ut_ad(mbminlen);
	ut_ad(mbmaxlen);
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	cs = all_charsets[cset];
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	if (cs) {
		*mbminlen = cs->mbminlen;
		*mbmaxlen = cs->mbmaxlen;
	} else {
		ut_a(cset == 0);
		*mbminlen = *mbmaxlen = 0;
	}
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}

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/**********************************************************************
Compares NUL-terminated UTF-8 strings case insensitively.

NOTE that the exact prototype of this function has to be in
/innobase/dict/dict0dict.c! */
extern "C"
int
innobase_strcasecmp(
/*================*/
				/* out: 0 if a=b, <0 if a<b, >1 if a>b */
	const char*	a,	/* in: first string to compare */
	const char*	b)	/* in: second string to compare */
{
	return(my_strcasecmp(system_charset_info, a, b));
}

/**********************************************************************
Makes all characters in a NUL-terminated UTF-8 string lower case.

NOTE that the exact prototype of this function has to be in
/innobase/dict/dict0dict.c! */
extern "C"
void
innobase_casedn_str(
/*================*/
	char*	a)	/* in/out: string to put in lower case */
{
	my_casedn_str(system_charset_info, a);
}

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/*************************************************************************
Creates a temporary file. */
extern "C"
int
innobase_mysql_tmpfile(void)
/*========================*/
			/* out: temporary file descriptor, or < 0 on error */
{
	char	filename[FN_REFLEN];
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	int	fd2 = -1;
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	File	fd = create_temp_file(filename, mysql_tmpdir, "ib",
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#ifdef __WIN__
				O_BINARY | O_TRUNC | O_SEQUENTIAL |
				O_TEMPORARY | O_SHORT_LIVED |
#endif /* __WIN__ */
				O_CREAT | O_EXCL | O_RDWR,
				MYF(MY_WME));
	if (fd >= 0) {
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#ifndef __WIN__
		/* On Windows, open files cannot be removed, but files can be
		created with the O_TEMPORARY flag to the same effect
		("delete on close"). */
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		unlink(filename);
#endif /* !__WIN__ */
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		/* Copy the file descriptor, so that the additional resources
		allocated by create_temp_file() can be freed by invoking
		my_close().

		Because the file descriptor returned by this function
		will be passed to fdopen(), it will be closed by invoking
		fclose(), which in turn will invoke close() instead of
		my_close(). */
		fd2 = dup(fd);
		if (fd2 < 0) {
			DBUG_PRINT("error",("Got error %d on dup",fd2));
			my_errno=errno;
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                        my_error(EE_OUT_OF_FILERESOURCES,
                                 MYF(ME_BELL+ME_WAITTANG),
                                 filename, my_errno);
                }
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		my_close(fd, MYF(MY_WME));
	}
	return(fd2);
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}

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/*************************************************************************
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Gets the InnoDB transaction handle for a MySQL handler object, creates
an InnoDB transaction struct if the corresponding MySQL thread struct still
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lacks one. */
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static
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trx_t*
check_trx_exists(
/*=============*/
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			/* out: InnoDB transaction handle */
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	THD*	thd)	/* in: user thread handle */
{
	trx_t*	trx;

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	ut_ad(thd == current_thd);
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        trx = (trx_t*) thd->ha_data[innobase_hton.slot];
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	if (trx == NULL) {
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	        DBUG_ASSERT(thd != NULL);
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		trx = trx_allocate_for_mysql();
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		trx->mysql_thd = thd;
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		trx->mysql_query_str = &(thd->query);
                trx->active_trans = 0;
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		/* Update the info whether we should skip XA steps that eat
		CPU time */
		trx->support_xa = (ibool)(thd->variables.innodb_support_xa);

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                thd->ha_data[innobase_hton.slot] = trx;
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	} else {
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		if (trx->magic_n != TRX_MAGIC_N) {
			mem_analyze_corruption((byte*)trx);

			ut_a(0);
		}
	}

	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	} else {
		trx->check_foreigns = TRUE;
	}

	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
		trx->check_unique_secondary = FALSE;
	} else {
		trx->check_unique_secondary = TRUE;
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	}

	return(trx);
}

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/*************************************************************************
Construct ha_innobase handler. */

ha_innobase::ha_innobase(TABLE *table_arg)
  :handler(&innobase_hton, table_arg),
  int_table_flags(HA_REC_NOT_IN_SEQ |
                  HA_NULL_IN_KEY |
                  HA_CAN_INDEX_BLOBS |
                  HA_CAN_SQL_HANDLER |
                  HA_NOT_EXACT_COUNT |
                  HA_PRIMARY_KEY_IN_READ_INDEX |
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                  HA_CAN_GEOMETRY |
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                  HA_TABLE_SCAN_ON_INDEX),
  start_of_scan(0),
  num_write_row(0)
{}

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/*************************************************************************
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Updates the user_thd field in a handle and also allocates a new InnoDB
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transaction handle if needed, and updates the transaction fields in the
prebuilt struct. */
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inline
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int
ha_innobase::update_thd(
/*====================*/
			/* out: 0 or error code */
	THD*	thd)	/* in: thd to use the handle */
{
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	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;
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	trx = check_trx_exists(thd);

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	if (prebuilt->trx != trx) {
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		row_update_prebuilt_trx(prebuilt, trx);
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	}

	user_thd = thd;
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	return(0);
}

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/*************************************************************************
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Registers that InnoDB takes part in an SQL statement, so that MySQL knows to
roll back the statement if the statement results in an error. This MUST be
called for every SQL statement that may be rolled back by MySQL. Calling this
several times to register the same statement is allowed, too. */
inline
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void
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innobase_register_stmt(
/*===================*/
	THD*	thd)	/* in: MySQL thd (connection) object */
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{
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        /* Register the statement */
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        trans_register_ha(thd, FALSE, &innobase_hton);
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}

/*************************************************************************
Registers an InnoDB transaction in MySQL, so that the MySQL XA code knows
to call the InnoDB prepare and commit, or rollback for the transaction. This
MUST be called for every transaction for which the user may call commit or
rollback. Calling this several times to register the same transaction is
allowed, too.
This function also registers the current SQL statement. */
inline
void
innobase_register_trx_and_stmt(
/*===========================*/
	THD*	thd)	/* in: MySQL thd (connection) object */
{
	/* NOTE that actually innobase_register_stmt() registers also
	the transaction in the AUTOCOMMIT=1 mode. */

	innobase_register_stmt(thd);
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        if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

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              /* No autocommit mode, register for a transaction */
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              trans_register_ha(thd, TRUE, &innobase_hton);
        }
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}
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/*   BACKGROUND INFO: HOW THE MYSQL QUERY CACHE WORKS WITH INNODB
     ------------------------------------------------------------

1) The use of the query cache for TBL is disabled when there is an
uncommitted change to TBL.

2) When a change to TBL commits, InnoDB stores the current value of
its global trx id counter, let us denote it by INV_TRX_ID, to the table object
in the InnoDB data dictionary, and does only allow such transactions whose
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id <= INV_TRX_ID to use the query cache.
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3) When InnoDB does an INSERT/DELETE/UPDATE to a table TBL, or an implicit
modification because an ON DELETE CASCADE, we invalidate the MySQL query cache
of TBL immediately.

How this is implemented inside InnoDB:

1) Since every modification always sets an IX type table lock on the InnoDB
table, it is easy to check if there can be uncommitted modifications for a
table: just check if there are locks in the lock list of the table.

2) When a transaction inside InnoDB commits, it reads the global trx id
counter and stores the value INV_TRX_ID to the tables on which it had a lock.

3) If there is an implicit table change from ON DELETE CASCADE or SET NULL,
InnoDB calls an invalidate method for the MySQL query cache for that table.

How this is implemented inside sql_cache.cc:

1) The query cache for an InnoDB table TBL is invalidated immediately at an
INSERT/UPDATE/DELETE, just like in the case of MyISAM. No need to delay
invalidation to the transaction commit.

2) To store or retrieve a value from the query cache of an InnoDB table TBL,
any query must first ask InnoDB's permission. We must pass the thd as a
parameter because InnoDB will look at the trx id, if any, associated with
that thd.

3) Use of the query cache for InnoDB tables is now allowed also when
AUTOCOMMIT==0 or we are inside BEGIN ... COMMIT. Thus transactions no longer
put restrictions on the use of the query cache.
*/

/**********************************************************************
The MySQL query cache uses this to check from InnoDB if the query cache at
the moment is allowed to operate on an InnoDB table. The SQL query must
be a non-locking SELECT.

The query cache is allowed to operate on certain query only if this function
returns TRUE for all tables in the query.

If thd is not in the autocommit state, this function also starts a new
transaction for thd if there is no active trx yet, and assigns a consistent
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read view to it if there is no read view yet.

Why a deadlock of threads is not possible: the query cache calls this function
at the start of a SELECT processing. Then the calling thread cannot be
holding any InnoDB semaphores. The calling thread is holding the
query cache mutex, and this function will reserver the InnoDB kernel mutex.
Thus, the 'rank' in sync0sync.h of the MySQL query cache mutex is above
the InnoDB kernel mutex. */
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my_bool
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innobase_query_caching_of_table_permitted(
/*======================================*/
				/* out: TRUE if permitted, FALSE if not;
				note that the value FALSE does not mean
				we should invalidate the query cache:
				invalidation is called explicitly */
	THD*	thd,		/* in: thd of the user who is trying to
				store a result to the query cache or
				retrieve it */
	char*	full_name,	/* in: concatenation of database name,
				the null character '\0', and the table
				name */
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	uint	full_name_len,	/* in: length of the full name, i.e.
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				len(dbname) + len(tablename) + 1 */
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        ulonglong *unused)      /* unused for this engine */
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{
	ibool	is_autocommit;
	trx_t*	trx;
	char	norm_name[1000];

	ut_a(full_name_len < 999);

	if (thd->variables.tx_isolation == ISO_SERIALIZABLE) {
		/* In the SERIALIZABLE mode we add LOCK IN SHARE MODE to every
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		plain SELECT if AUTOCOMMIT is not on. */
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		return((my_bool)FALSE);
	}

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        trx = check_trx_exists(thd);
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	if (trx->has_search_latch) {
		ut_print_timestamp(stderr);
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		sql_print_error("The calling thread is holding the adaptive "
				"search, latch though calling "
				"innobase_query_caching_of_table_permitted.");
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		mutex_enter_noninline(&kernel_mutex);
		trx_print(stderr, trx, 1024);
		mutex_exit_noninline(&kernel_mutex);
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	}

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	innobase_release_stat_resources(trx);

	if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {

		is_autocommit = TRUE;
	} else {
		is_autocommit = FALSE;

	}

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	if (is_autocommit && trx->n_mysql_tables_in_use == 0) {
		/* We are going to retrieve the query result from the query
		cache. This cannot be a store operation to the query cache
		because then MySQL would have locks on tables already.

		TODO: if the user has used LOCK TABLES to lock the table,
		then we open a transaction in the call of row_.. below.
		That trx can stay open until UNLOCK TABLES. The same problem
		exists even if we do not use the query cache. MySQL should be
		modified so that it ALWAYS calls some cleanup function when
		the processing of a query ends!

		We can imagine we instantaneously serialize this consistent
		read trx to the current trx id counter. If trx2 would have
		changed the tables of a query result stored in the cache, and
		trx2 would have already committed, making the result obsolete,
		then trx2 would have already invalidated the cache. Thus we
		can trust the result in the cache is ok for this query. */
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		return((my_bool)TRUE);
	}
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	/* Normalize the table name to InnoDB format */

	memcpy(norm_name, full_name, full_name_len);

	norm_name[strlen(norm_name)] = '/'; /* InnoDB uses '/' as the
					    separator between db and table */
	norm_name[full_name_len] = '\0';
#ifdef __WIN__
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	innobase_casedn_str(norm_name);
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#endif
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	/* The call of row_search_.. will start a new transaction if it is
	not yet started */

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        if (trx->active_trans == 0) {

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                innobase_register_trx_and_stmt(thd);
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                trx->active_trans = 1;
        }
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	if (row_search_check_if_query_cache_permitted(trx, norm_name)) {

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		/* printf("Query cache for %s permitted\n", norm_name); */
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		return((my_bool)TRUE);
	}

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	/* printf("Query cache for %s NOT permitted\n", norm_name); */
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	return((my_bool)FALSE);
}

/*********************************************************************
Invalidates the MySQL query cache for the table.
NOTE that the exact prototype of this function has to be in
/innobase/row/row0ins.c! */
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extern "C"
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void
innobase_invalidate_query_cache(
/*============================*/
	trx_t*	trx,		/* in: transaction which modifies the table */
	char*	full_name,	/* in: concatenation of database name, null
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				char '\0', table name, null char'\0';
				NOTE that in Windows this is always
				in LOWER CASE! */
	ulint	full_name_len)	/* in: full name length where also the null
				chars count */
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{
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	/* Note that the sync0sync.h rank of the query cache mutex is just
	above the InnoDB kernel mutex. The caller of this function must not
	have latches of a lower rank. */

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	/* Argument TRUE below means we are using transactions */
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#ifdef HAVE_QUERY_CACHE
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	query_cache.invalidate((THD*)(trx->mysql_thd),
					(const char*)full_name,
					(uint32)full_name_len,
					TRUE);
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#endif
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}
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/*********************************************************************
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Get the quote character to be used in SQL identifiers.
This definition must match the one in innobase/ut/ut0ut.c! */
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extern "C"
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int
mysql_get_identifier_quote_char(
/*============================*/
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				/* out: quote character to be
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				used in SQL identifiers; EOF if none */
	trx_t*		trx,	/* in: transaction */
	const char*	name,	/* in: name to print */
	ulint		namelen)/* in: length of name */
{
	if (!trx || !trx->mysql_thd) {
		return(EOF);
	}
	return(get_quote_char_for_identifier((THD*) trx->mysql_thd,
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						name, (int) namelen));
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}

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/**************************************************************************
Determines if the currently running transaction has been interrupted. */
extern "C"
ibool
trx_is_interrupted(
/*===============*/
			/* out: TRUE if interrupted */
	trx_t*	trx)	/* in: transaction */
{
	return(trx && trx->mysql_thd && ((THD*) trx->mysql_thd)->killed);
}

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/**************************************************************************
Obtain a pointer to the MySQL THD object, as in current_thd().  This
definition must match the one in sql/ha_innodb.cc! */
extern "C"
void*
innobase_current_thd(void)
/*======================*/
			/* out: MySQL THD object */
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{
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	return(current_thd);
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}

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/*********************************************************************
Call this when you have opened a new table handle in HANDLER, before you
call index_read_idx() etc. Actually, we can let the cursor stay open even
over a transaction commit! Then you should call this before every operation,
1138
fetch next etc. This function inits the necessary things even after a
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transaction commit. */

void
ha_innobase::init_table_handle_for_HANDLER(void)
/*============================================*/
{
        row_prebuilt_t* prebuilt;

        /* If current thd does not yet have a trx struct, create one.
        If the current handle does not yet have a prebuilt struct, create
        one. Update the trx pointers in the prebuilt struct. Normally
        this operation is done in external_lock. */

        update_thd(current_thd);

        /* Initialize the prebuilt struct much like it would be inited in
        external_lock */

        prebuilt = (row_prebuilt_t*)innobase_prebuilt;

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	innobase_release_stat_resources(prebuilt->trx);

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        /* If the transaction is not started yet, start it */

        trx_start_if_not_started_noninline(prebuilt->trx);

        /* Assign a read view if the transaction does not have it yet */

        trx_assign_read_view(prebuilt->trx);

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	/* Set the MySQL flag to mark that there is an active transaction */

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        if (prebuilt->trx->active_trans == 0) {

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                innobase_register_trx_and_stmt(current_thd);
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                prebuilt->trx->active_trans = 1;
        }
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        /* We did the necessary inits in this function, no need to repeat them
        in row_search_for_mysql */

        prebuilt->sql_stat_start = FALSE;

        /* We let HANDLER always to do the reads as consistent reads, even
        if the trx isolation level would have been specified as SERIALIZABLE */

        prebuilt->select_lock_type = LOCK_NONE;
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        prebuilt->stored_select_lock_type = LOCK_NONE;
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        /* Always fetch all columns in the index record */

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        prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
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        /* We want always to fetch all columns in the whole row? Or do
	we???? */

        prebuilt->read_just_key = FALSE;
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	prebuilt->used_in_HANDLER = TRUE;
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	prebuilt->keep_other_fields_on_keyread = FALSE;
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}

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/*************************************************************************
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Opens an InnoDB database. */
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bool
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innobase_init(void)
/*===============*/
1209
			/* out: &innobase_hton, or NULL on error */
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{
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	static char	current_dir[3];		/* Set if using current lib */
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	int		err;
	bool		ret;
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	char 	        *default_path;
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  	DBUG_ENTER("innobase_init");

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         if (have_innodb != SHOW_OPTION_YES)
           goto error;

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	ut_a(DATA_MYSQL_TRUE_VARCHAR == (ulint)MYSQL_TYPE_VARCHAR);

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	/* Check that values don't overflow on 32-bit systems. */
	if (sizeof(ulint) == 4) {
		if (innobase_buffer_pool_size > UINT_MAX32) {
			sql_print_error(
				"innobase_buffer_pool_size can't be over 4GB"
				" on 32-bit systems");

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			goto error;
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		}

		if (innobase_log_file_size > UINT_MAX32) {
			sql_print_error(
				"innobase_log_file_size can't be over 4GB"
				" on 32-bit systems");

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			goto error;
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		}
	}

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  	os_innodb_umask = (ulint)my_umask;
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	/* First calculate the default path for innodb_data_home_dir etc.,
	in case the user has not given any value.

	Note that when using the embedded server, the datadirectory is not
	necessarily the current directory of this program. */

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	if (mysqld_embedded) {
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		default_path = mysql_real_data_home;
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		fil_path_to_mysql_datadir = mysql_real_data_home;
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	} else {
	  	/* It's better to use current lib, to keep paths short */
	  	current_dir[0] = FN_CURLIB;
	  	current_dir[1] = FN_LIBCHAR;
	  	current_dir[2] = 0;
	  	default_path = current_dir;
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	}

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	ut_a(default_path);

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	if (specialflag & SPECIAL_NO_PRIOR) {
	        srv_set_thread_priorities = FALSE;
	} else {
	        srv_set_thread_priorities = TRUE;
	        srv_query_thread_priority = QUERY_PRIOR;
	}
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	/* Set InnoDB initialization parameters according to the values
	read from MySQL .cnf file */
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	/*--------------- Data files -------------------------*/
1274

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	/* The default dir for data files is the datadir of MySQL */
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	srv_data_home = (innobase_data_home_dir ? innobase_data_home_dir :
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			 default_path);
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	/* Set default InnoDB data file size to 10 MB and let it be
  	auto-extending. Thus users can use InnoDB in >= 4.0 without having
	to specify any startup options. */

	if (!innobase_data_file_path) {
  		innobase_data_file_path = (char*) "ibdata1:10M:autoextend";
	}

	/* Since InnoDB edits the argument in the next call, we make another
	copy of it: */

	internal_innobase_data_file_path = my_strdup(innobase_data_file_path,
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						   MYF(MY_FAE));
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	ret = (bool) srv_parse_data_file_paths_and_sizes(
				internal_innobase_data_file_path,
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				&srv_data_file_names,
				&srv_data_file_sizes,
				&srv_data_file_is_raw_partition,
				&srv_n_data_files,
				&srv_auto_extend_last_data_file,
				&srv_last_file_size_max);
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	if (ret == FALSE) {
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	  	sql_print_error(
			"InnoDB: syntax error in innodb_data_file_path");
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	  	my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
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                goto error;
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	}
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	/* -------------- Log files ---------------------------*/

	/* The default dir for log files is the datadir of MySQL */
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	if (!innobase_log_group_home_dir) {
	  	innobase_log_group_home_dir = default_path;
	}
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#ifdef UNIV_LOG_ARCHIVE
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	/* Since innodb_log_arch_dir has no relevance under MySQL,
	starting from 4.0.6 we always set it the same as
	innodb_log_group_home_dir: */

	innobase_log_arch_dir = innobase_log_group_home_dir;

	srv_arch_dir = innobase_log_arch_dir;
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#endif /* UNIG_LOG_ARCHIVE */
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	ret = (bool)
		srv_parse_log_group_home_dirs(innobase_log_group_home_dir,
						&srv_log_group_home_dirs);
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	if (ret == FALSE || innobase_mirrored_log_groups != 1) {
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	  sql_print_error("syntax error in innodb_log_group_home_dir, or a "
			  "wrong number of mirrored log groups");
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	  	my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
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                goto error;
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	}
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	/* --------------------------------------------------*/

	srv_file_flush_method_str = innobase_unix_file_flush_method;
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	srv_n_log_groups = (ulint) innobase_mirrored_log_groups;
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	srv_n_log_files = (ulint) innobase_log_files_in_group;
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	srv_log_file_size = (ulint) innobase_log_file_size;

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#ifdef UNIV_LOG_ARCHIVE
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	srv_log_archive_on = (ulint) innobase_log_archive;
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#endif /* UNIV_LOG_ARCHIVE */
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	srv_log_buffer_size = (ulint) innobase_log_buffer_size;
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        /* We set srv_pool_size here in units of 1 kB. InnoDB internally
        changes the value so that it becomes the number of database pages. */
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        if (innobase_buffer_pool_awe_mem_mb == 0) {
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                /* Careful here: we first convert the signed long int to ulint
                and only after that divide */
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                srv_pool_size = ((ulint) innobase_buffer_pool_size) / 1024;
        } else {
                srv_use_awe = TRUE;
                srv_pool_size = (ulint)
                                (1024 * innobase_buffer_pool_awe_mem_mb);
                srv_awe_window_size = (ulint) innobase_buffer_pool_size;
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                /* Note that what the user specified as
                innodb_buffer_pool_size is actually the AWE memory window
                size in this case, and the real buffer pool size is
                determined by .._awe_mem_mb. */
        }
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	srv_mem_pool_size = (ulint) innobase_additional_mem_pool_size;

	srv_n_file_io_threads = (ulint) innobase_file_io_threads;
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	srv_lock_wait_timeout = (ulint) innobase_lock_wait_timeout;
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	srv_force_recovery = (ulint) innobase_force_recovery;

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	srv_use_doublewrite_buf = (ibool) innobase_use_doublewrite;
	srv_use_checksums = (ibool) innobase_use_checksums;
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	os_use_large_pages = (ibool) innobase_use_large_pages;
	os_large_page_size = (ulint) innobase_large_page_size;
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	row_rollback_on_timeout = (ibool) innobase_rollback_on_timeout;

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	srv_file_per_table = (ibool) innobase_file_per_table;
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        srv_locks_unsafe_for_binlog = (ibool) innobase_locks_unsafe_for_binlog;
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	srv_max_n_open_files = (ulint) innobase_open_files;
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	srv_innodb_status = (ibool) innobase_create_status_file;
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	srv_print_verbose_log = mysqld_embedded ? 0 : 1;
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	/* Store the default charset-collation number of this MySQL
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	installation */
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	data_mysql_default_charset_coll = (ulint)default_charset_info->number;
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	ut_a(DATA_MYSQL_LATIN1_SWEDISH_CHARSET_COLL ==
					my_charset_latin1.number);
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	ut_a(DATA_MYSQL_BINARY_CHARSET_COLL == my_charset_bin.number);
1405

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	/* Store the latin1_swedish_ci character ordering table to InnoDB. For
	non-latin1_swedish_ci charsets we use the MySQL comparison functions,
	and consequently we do not need to know the ordering internally in
	InnoDB. */
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	ut_a(0 == strcmp((char*)my_charset_latin1.name,
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						(char*)"latin1_swedish_ci"));
	memcpy(srv_latin1_ordering, my_charset_latin1.sort_order, 256);
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	/* Since we in this module access directly the fields of a trx
        struct, and due to different headers and flags it might happen that
	mutex_t has a different size in this module and in InnoDB
	modules, we check at run time that the size is the same in
	these compilation modules. */

	srv_sizeof_trx_t_in_ha_innodb_cc = sizeof(trx_t);

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	err = innobase_start_or_create_for_mysql();
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	if (err != DB_SUCCESS) {
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	  	my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
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                goto error;
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	}
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	(void) hash_init(&innobase_open_tables,system_charset_info, 32, 0, 0,
			 		(hash_get_key) innobase_get_key, 0, 0);
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        pthread_mutex_init(&innobase_share_mutex, MY_MUTEX_INIT_FAST);
        pthread_mutex_init(&prepare_commit_mutex, MY_MUTEX_INIT_FAST);
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        pthread_mutex_init(&commit_threads_m, MY_MUTEX_INIT_FAST);
        pthread_mutex_init(&commit_cond_m, MY_MUTEX_INIT_FAST);
        pthread_cond_init(&commit_cond, NULL);
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	innodb_inited= 1;
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	/* If this is a replication slave and we needed to do a crash recovery,
	set the master binlog position to what InnoDB internally knew about
	how far we got transactions durable inside InnoDB. There is a
	problem here: if the user used also MyISAM tables, InnoDB might not
	know the right position for them.

	THIS DOES NOT WORK CURRENTLY because replication seems to initialize
	glob_mi also after innobase_init. */
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/*	if (trx_sys_mysql_master_log_pos != -1) {
		ut_memcpy(glob_mi.log_file_name, trx_sys_mysql_master_log_name,
				1 + ut_strlen(trx_sys_mysql_master_log_name));
		glob_mi.pos = trx_sys_mysql_master_log_pos;
	}
*/
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	DBUG_RETURN(FALSE);
error:
        have_innodb= SHOW_OPTION_DISABLED;	// If we couldn't use handler
        DBUG_RETURN(TRUE);
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}

/***********************************************************************
1462
Closes an InnoDB database. */
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1464
bool
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innobase_end(void)
/*==============*/
1467
				/* out: TRUE if error */
1468
{
1469
	int	err= 0;
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	DBUG_ENTER("innobase_end");

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#ifdef __NETWARE__ 	/* some special cleanup for NetWare */
	if (nw_panic) {
		set_panic_flag_for_netware();
	}
#endif
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	if (innodb_inited) {
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	        srv_fast_shutdown = (ulint) innobase_fast_shutdown;
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	  	innodb_inited = 0;
	  	if (innobase_shutdown_for_mysql() != DB_SUCCESS) {
	    		err = 1;
		}
	  	hash_free(&innobase_open_tables);
	  	my_free(internal_innobase_data_file_path,
						MYF(MY_ALLOW_ZERO_PTR));
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                pthread_mutex_destroy(&innobase_share_mutex);
                pthread_mutex_destroy(&prepare_commit_mutex);
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                pthread_mutex_destroy(&commit_threads_m);
                pthread_mutex_destroy(&commit_cond_m);
                pthread_cond_destroy(&commit_cond);
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	}
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  	DBUG_RETURN(err);
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}

/********************************************************************
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Flushes InnoDB logs to disk and makes a checkpoint. Really, a commit flushes
the logs, and the name of this function should be innobase_checkpoint. */
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1502
bool
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innobase_flush_logs(void)
/*=====================*/
1505
				/* out: TRUE if error */
1506
{
1507
  	bool 	result = 0;
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  	DBUG_ENTER("innobase_flush_logs");

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	log_buffer_flush_to_disk();
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  	DBUG_RETURN(result);
}

/*********************************************************************
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Commits a transaction in an InnoDB database. */
1518

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void
innobase_commit_low(
/*================*/
	trx_t*	trx)	/* in: transaction handle */
{
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        if (trx->conc_state == TRX_NOT_STARTED) {
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                return;
        }
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#ifdef HAVE_REPLICATION
        THD *thd=current_thd;

        if (thd && thd->slave_thread) {
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                /* Update the replication position info inside InnoDB */
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                trx->mysql_master_log_file_name
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                                        = active_mi->rli.group_master_log_name;
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                trx->mysql_master_log_pos = ((ib_longlong)
                                active_mi->rli.future_group_master_log_pos);
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        }
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#endif /* HAVE_REPLICATION */
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	trx_commit_for_mysql(trx);
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}

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/*********************************************************************
Creates an InnoDB transaction struct for the thd if it does not yet have one.
Starts a new InnoDB transaction if a transaction is not yet started. And
assigns a new snapshot for a consistent read if the transaction does not yet
have one. */

int
innobase_start_trx_and_assign_read_view(
/*====================================*/
			/* out: 0 */
	THD*	thd)	/* in: MySQL thread handle of the user for whom
			the transaction should be committed */
{
	trx_t*	trx;

  	DBUG_ENTER("innobase_start_trx_and_assign_read_view");

	/* Create a new trx struct for thd, if it does not yet have one */

	trx = check_trx_exists(thd);

	/* This is just to play safe: release a possible FIFO ticket and
	search latch. Since we will reserve the kernel mutex, we have to
	release the search system latch first to obey the latching order. */

	innobase_release_stat_resources(trx);

	/* If the transaction is not started yet, start it */

	trx_start_if_not_started_noninline(trx);

	/* Assign a read view if the transaction does not have it yet */

	trx_assign_read_view(trx);

	/* Set the MySQL flag to mark that there is an active transaction */

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        if (trx->active_trans == 0) {

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                innobase_register_trx_and_stmt(current_thd);
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                trx->active_trans = 1;
        }
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	DBUG_RETURN(0);
}

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/*********************************************************************
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Commits a transaction in an InnoDB database or marks an SQL statement
ended. */
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static
int
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innobase_commit(
/*============*/
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			/* out: 0 */
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	THD*	thd,	/* in: MySQL thread handle of the user for whom
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			the transaction should be committed */
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        bool    all)    /* in: TRUE - commit transaction
                               FALSE - the current SQL statement ended */
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{
1605
	trx_t*		trx;
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  	DBUG_ENTER("innobase_commit");
  	DBUG_PRINT("trans", ("ending transaction"));

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	trx = check_trx_exists(thd);
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	/* Update the info whether we should skip XA steps that eat CPU time */
	trx->support_xa = (ibool)(thd->variables.innodb_support_xa);

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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */
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        if (trx->has_search_latch) {
                          trx_search_latch_release_if_reserved(trx);
        }
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        /* The flag trx->active_trans is set to 1 in
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	1. ::external_lock(),
	2. ::start_stmt(),
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	3. innobase_query_caching_of_table_permitted(),
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	4. innobase_savepoint(),
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	5. ::init_table_handle_for_HANDLER(),
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	6. innobase_start_trx_and_assign_read_view(),
	7. ::transactional_table_lock()
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	and it is only set to 0 in a commit or a rollback. If it is 0 we know
	there cannot be resources to be freed and we could return immediately.
	For the time being, we play safe and do the cleanup though there should
	be nothing to clean up. */
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        if (trx->active_trans == 0
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	    && trx->conc_state != TRX_NOT_STARTED) {
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	  sql_print_error("trx->active_trans == 0, but trx->conc_state != "
			  "TRX_NOT_STARTED");
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	}
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        if (all
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
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 		/* We were instructed to commit the whole transaction, or
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		this is an SQL statement end and autocommit is on */

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                /* We need current binlog position for ibbackup to work.
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                Note, the position is current because of prepare_commit_mutex */
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retry:
                if (srv_commit_concurrency > 0)
                {
                  pthread_mutex_lock(&commit_cond_m);
                  commit_threads++;
                  if (commit_threads > srv_commit_concurrency)
                  {
                    commit_threads--;
                    pthread_cond_wait(&commit_cond, &commit_cond_m);
                    pthread_mutex_unlock(&commit_cond_m);
                    goto retry;
                  }
                  else
                    pthread_mutex_unlock(&commit_cond_m);
                }
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                trx->mysql_log_file_name = mysql_bin_log.get_log_fname();
                trx->mysql_log_offset =
                        (ib_longlong)mysql_bin_log.get_log_file()->pos_in_file;

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		innobase_commit_low(trx);
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                if (srv_commit_concurrency > 0)
                {
                  pthread_mutex_lock(&commit_cond_m);
                  commit_threads--;
                  pthread_cond_signal(&commit_cond);
                  pthread_mutex_unlock(&commit_cond_m);
                }
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                if (trx->active_trans == 2) {

                        pthread_mutex_unlock(&prepare_commit_mutex);
                }
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                trx->active_trans = 0;
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	} else {
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	        /* We just mark the SQL statement ended and do not do a
		transaction commit */

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		if (trx->auto_inc_lock) {
			/* If we had reserved the auto-inc lock for some
			table in this SQL statement we release it now */
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			row_unlock_table_autoinc_for_mysql(trx);
		}
		/* Store the current undo_no of the transaction so that we
		know where to roll back if we have to roll back the next
		SQL statement */

		trx_mark_sql_stat_end(trx);
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	}
1705

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	/* Tell the InnoDB server that there might be work for utility
	threads: */
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        if (trx->declared_to_be_inside_innodb) {
                          /* Release our possible ticket in the FIFO */
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                          srv_conc_force_exit_innodb(trx);
        }
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	srv_active_wake_master_thread();

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	DBUG_RETURN(0);
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}

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/* TODO: put the
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MySQL-4.1 functionality back to 5.0. This is needed to get InnoDB Hot Backup
to work. */
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/*********************************************************************
This is called when MySQL writes the binlog entry for the current
transaction. Writes to the InnoDB tablespace info which tells where the
MySQL binlog entry for the current transaction ended. Also commits the
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transaction inside InnoDB but does NOT flush InnoDB log files to disk.
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To flush you have to call innobase_commit_complete(). We have separated
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flushing to eliminate the bottleneck of LOCK_log in log.cc which disabled
InnoDB's group commit capability. */
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int
innobase_report_binlog_offset_and_commit(
/*=====================================*/
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                                /* out: 0 */
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        THD*    thd,            /* in: user thread */
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        void*   trx_handle,     /* in: InnoDB trx handle */
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        char*   log_file_name,  /* in: latest binlog file name */
        my_off_t end_offset)    /* in: the offset in the binlog file
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                                   up to which we wrote */
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{
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	trx_t*	trx;

	trx = (trx_t*)trx_handle;
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	ut_a(trx != NULL);

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	trx->mysql_log_file_name = log_file_name;
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	trx->mysql_log_offset = (ib_longlong)end_offset;
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	trx->flush_log_later = TRUE;

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	innobase_commit(thd, TRUE);
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	trx->flush_log_later = FALSE;

	return(0);
}

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#if 0
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/***********************************************************************
This function stores the binlog offset and flushes logs. */

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void
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innobase_store_binlog_offset_and_flush_log(
/*=======================================*/
    char *binlog_name,          /* in: binlog name */
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    longlong	offset)		/* in: binlog offset */
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{
	mtr_t mtr;
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	assert(binlog_name != NULL);

	/* Start a mini-transaction */
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        mtr_start_noninline(&mtr);
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	/* Update the latest MySQL binlog name and offset info
        in trx sys header */

        trx_sys_update_mysql_binlog_offset(
            binlog_name,
            offset,
            TRX_SYS_MYSQL_LOG_INFO, &mtr);

        /* Commits the mini-transaction */
        mtr_commit(&mtr);
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	/* Synchronous flush of the log buffer to disk */
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	log_buffer_flush_to_disk();
}
#endif

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/*********************************************************************
This is called after MySQL has written the binlog entry for the current
transaction. Flushes the InnoDB log files to disk if required. */

int
innobase_commit_complete(
/*=====================*/
                                /* out: 0 */
1800
        THD*    thd)            /* in: user thread */
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{
	trx_t*	trx;

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        trx = (trx_t*) thd->ha_data[innobase_hton.slot];
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        if (trx && trx->active_trans) {
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                trx->active_trans = 0;
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                if (UNIV_UNLIKELY(srv_flush_log_at_trx_commit == 0)) {
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                        return(0);
                }
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                trx_commit_complete_for_mysql(trx);
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        }
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	return(0);
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}

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/*********************************************************************
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Rolls back a transaction or the latest SQL statement. */
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static int
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innobase_rollback(
/*==============*/
			/* out: 0 or error number */
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	THD*	thd,	/* in: handle to the MySQL thread of the user
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			whose transaction should be rolled back */
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        bool    all)    /* in: TRUE - commit transaction
                               FALSE - the current SQL statement ended */
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{
	int	error = 0;
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	trx_t*	trx;
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	DBUG_ENTER("innobase_rollback");
	DBUG_PRINT("trans", ("aborting transaction"));

1839
	trx = check_trx_exists(thd);
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	/* Update the info whether we should skip XA steps that eat CPU time */
	trx->support_xa = (ibool)(thd->variables.innodb_support_xa);

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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

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        if (trx->auto_inc_lock) {
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		/* If we had reserved the auto-inc lock for some table (if
		we come here to roll back the latest SQL statement) we
		release it now before a possibly lengthy rollback */
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		row_unlock_table_autoinc_for_mysql(trx);
	}

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        if (all
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
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		error = trx_rollback_for_mysql(trx);
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                trx->active_trans = 0;
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	} else {
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		error = trx_rollback_last_sql_stat_for_mysql(trx);
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	}
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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/*********************************************************************
Rolls back a transaction */

int
innobase_rollback_trx(
/*==================*/
			/* out: 0 or error number */
	trx_t*	trx)	/*  in: transaction */
{
	int	error = 0;

	DBUG_ENTER("innobase_rollback_trx");
	DBUG_PRINT("trans", ("aborting transaction"));

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

        if (trx->auto_inc_lock) {
		/* If we had reserved the auto-inc lock for some table (if
		we come here to roll back the latest SQL statement) we
		release it now before a possibly lengthy rollback */
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1895 1896 1897 1898 1899 1900 1901 1902
		row_unlock_table_autoinc_for_mysql(trx);
	}

	error = trx_rollback_for_mysql(trx);

	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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/*********************************************************************
Rolls back a transaction to a savepoint. */

1906
static int
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innobase_rollback_to_savepoint(
/*===========================*/
				/* out: 0 if success, HA_ERR_NO_SAVEPOINT if
				no savepoint with the given name */
	THD*	thd,		/* in: handle to the MySQL thread of the user
				whose transaction should be rolled back */
1913
        void *savepoint)        /* in: savepoint data */
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{
	ib_longlong mysql_binlog_cache_pos;
	int	    error = 0;
	trx_t*	    trx;
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        char 	    name[64];
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	DBUG_ENTER("innobase_rollback_to_savepoint");

	trx = check_trx_exists(thd);

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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */
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	innobase_release_stat_resources(trx);
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        /* TODO: use provided savepoint data area to store savepoint data */
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        longlong2str((ulint)savepoint, name, 36);
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        error = (int) trx_rollback_to_savepoint_for_mysql(trx, name,
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						&mysql_binlog_cache_pos);
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
1937 1938
}

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/*********************************************************************
Release transaction savepoint name. */
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static
int
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innobase_release_savepoint(
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/*=======================*/
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				/* out: 0 if success, HA_ERR_NO_SAVEPOINT if
				no savepoint with the given name */
	THD*	thd,		/* in: handle to the MySQL thread of the user
				whose transaction should be rolled back */
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        void*	savepoint)      /* in: savepoint data */
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{
	int	    error = 0;
	trx_t*	    trx;
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        char 	    name[64];
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	DBUG_ENTER("innobase_release_savepoint");
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	trx = check_trx_exists(thd);

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        /* TODO: use provided savepoint data area to store savepoint data */
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        longlong2str((ulint)savepoint, name, 36);
1962

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	error = (int) trx_release_savepoint_for_mysql(trx, name);
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

1968
/*********************************************************************
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Sets a transaction savepoint. */
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static
int
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innobase_savepoint(
/*===============*/
				/* out: always 0, that is, always succeeds */
	THD*	thd,		/* in: handle to the MySQL thread */
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        void*	savepoint)      /* in: savepoint data */
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{
	int	error = 0;
	trx_t*	trx;

	DBUG_ENTER("innobase_savepoint");

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        /*
          In the autocommit mode there is no sense to set a savepoint
          (unless we are in sub-statement), so SQL layer ensures that
          this method is never called in such situation.
        */
        DBUG_ASSERT(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
                    thd->in_sub_stmt);
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	trx = check_trx_exists(thd);

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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

1999 2000
        /* cannot happen outside of transaction */
        DBUG_ASSERT(trx->active_trans);
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2002
        /* TODO: use provided savepoint data area to store savepoint data */
2003
        char name[64];
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        longlong2str((ulint)savepoint,name,36);
2005

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        error = (int) trx_savepoint_for_mysql(trx, name, (ib_longlong)0);
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

2011
/*********************************************************************
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Frees a possible InnoDB trx object associated with the current THD. */
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static
int
2015 2016
innobase_close_connection(
/*======================*/
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			/* out: 0 or error number */
	THD*	thd)	/* in: handle to the MySQL thread of the user
2019
			whose resources should be free'd */
2020
{
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	trx_t*	trx;

	trx = (trx_t*)thd->ha_data[innobase_hton.slot];

	ut_a(trx);

2027 2028
        if (trx->active_trans == 0
	    && trx->conc_state != TRX_NOT_STARTED) {
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2030 2031
	  sql_print_error("trx->active_trans == 0, but trx->conc_state != "
			  "TRX_NOT_STARTED");
2032 2033 2034
	}


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	if (trx->conc_state != TRX_NOT_STARTED &&
            global_system_variables.log_warnings)
          sql_print_warning("MySQL is closing a connection that has an active "
                            "InnoDB transaction.  %lu row modifications will "
                            "roll back.",
                            (ulong)trx->undo_no.low);
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	innobase_rollback_trx(trx);

        trx_free_for_mysql(trx);

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	return(0);
2047
}
2048 2049 2050


/*****************************************************************************
2051
** InnoDB database tables
2052 2053
*****************************************************************************/

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/********************************************************************
Get the record format from the data dictionary. */
enum row_type
ha_innobase::get_row_type() const
/*=============================*/
			/* out: ROW_TYPE_REDUNDANT or ROW_TYPE_COMPACT */
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;

	if (prebuilt && prebuilt->table) {
		if (prebuilt->table->comp) {
			return(ROW_TYPE_COMPACT);
		} else {
			return(ROW_TYPE_REDUNDANT);
		}
	}
	ut_ad(0);
	return(ROW_TYPE_NOT_USED);
}

2074
/********************************************************************
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Gives the file extension of an InnoDB single-table tablespace. */
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static const char* ha_innobase_exts[] = {
  ".ibd",
  NullS
};
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const char**
ha_innobase::bas_ext() const
/*========================*/
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				/* out: file extension string */
2085
{
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  return ha_innobase_exts;
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}

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/*********************************************************************
Normalizes a table name string. A normalized name consists of the
database name catenated to '/' and table name. An example:
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test/mytable. On Windows normalization puts both the database name and the
table name always to lower case. */
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static
void
normalize_table_name(
/*=================*/
	char*		norm_name,	/* out: normalized name as a
					null-terminated string */
	const char*	name)		/* in: table name string */
{
	char*	name_ptr;
	char*	db_ptr;
	char*	ptr;

	/* Scan name from the end */

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	ptr = strend(name)-1;
2110 2111 2112 2113 2114 2115 2116

	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	name_ptr = ptr + 1;

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	DBUG_ASSERT(ptr > name);
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	ptr--;
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	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	db_ptr = ptr + 1;

	memcpy(norm_name, db_ptr, strlen(name) + 1 - (db_ptr - name));

	norm_name[name_ptr - db_ptr - 1] = '/';
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#ifdef __WIN__
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	innobase_casedn_str(norm_name);
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#endif
2134
}
2135

2136
/*********************************************************************
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Creates and opens a handle to a table which already exists in an InnoDB
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database. */

int
ha_innobase::open(
/*==============*/
					/* out: 1 if error, 0 if success */
	const char*	name,		/* in: table name */
	int 		mode,		/* in: not used */
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	uint 		test_if_locked)	/* in: not used */
2147
{
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	dict_table_t*	ib_table;
  	char		norm_name[1000];
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	THD*		thd;
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	DBUG_ENTER("ha_innobase::open");

	UT_NOT_USED(mode);
	UT_NOT_USED(test_if_locked);

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	thd = current_thd;
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	normalize_table_name(norm_name, name);

2160 2161
	user_thd = NULL;

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	last_query_id = (ulong)-1;

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	if (!(share=get_share(name))) {

		DBUG_RETURN(1);
	}
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	/* Create buffers for packing the fields of a record. Why
	table->reclength did not work here? Obviously, because char
	fields when packed actually became 1 byte longer, when we also
	stored the string length as the first byte. */
2173

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	upd_and_key_val_buff_len =
				table->s->reclength + table->s->max_key_length
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							+ MAX_REF_PARTS * 3;
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	if (!(mysql_byte*) my_multi_malloc(MYF(MY_WME),
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				     &upd_buff, upd_and_key_val_buff_len,
				     &key_val_buff, upd_and_key_val_buff_len,
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				     NullS)) {
2181
	  	free_share(share);
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2183
	  	DBUG_RETURN(1);
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  	}

2186
	/* Get pointer to a table object in InnoDB dictionary cache */
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	ib_table = dict_table_get_and_increment_handle_count(
				      		     norm_name, NULL);
 	if (NULL == ib_table) {
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	        ut_print_timestamp(stderr);
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		sql_print_error("Cannot find table %s from the internal data "
				"dictionary\nof InnoDB though the .frm file "
				"for the table exists. Maybe you\nhave "
				"deleted and recreated InnoDB data files but "
				"have forgotten\nto delete the corresponding "
				".frm files of InnoDB tables, or you\n"
				"have moved .frm files to another database?\n"
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				"See http://dev.mysql.com/doc/refman/5.0/en/innodb-troubleshooting.html\n"
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				"how you can resolve the problem.\n",
				norm_name);
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	        free_share(share);
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    		my_free((gptr) upd_buff, MYF(0));
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    		my_errno = ENOENT;
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    		DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
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  	}

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 	if (ib_table->ibd_file_missing && !thd->tablespace_op) {
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	        ut_print_timestamp(stderr);
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		sql_print_error("MySQL is trying to open a table handle but "
				"the .ibd file for\ntable %s does not exist.\n"
				"Have you deleted the .ibd file from the "
				"database directory under\nthe MySQL datadir, "
				"or have you used DISCARD TABLESPACE?\n"
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				"See http://dev.mysql.com/doc/refman/5.0/en/innodb-troubleshooting.html\n"
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				"how you can resolve the problem.\n",
				norm_name);
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	        free_share(share);
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    		my_free((gptr) upd_buff, MYF(0));
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    		my_errno = ENOENT;
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		dict_table_decrement_handle_count(ib_table);
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    		DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
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  	}

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	innobase_prebuilt = row_create_prebuilt(ib_table);
2228

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	((row_prebuilt_t*)innobase_prebuilt)->mysql_row_len =
							table->s->reclength;
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	/* Looks like MySQL-3.23 sometimes has primary key number != 0 */

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 	primary_key = table->s->primary_key;
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	key_used_on_scan = primary_key;
2236

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	/* Allocate a buffer for a 'row reference'. A row reference is
	a string of bytes of length ref_length which uniquely specifies
        a row in our table. Note that MySQL may also compare two row
        references for equality by doing a simple memcmp on the strings
        of length ref_length! */
2242

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  	if (!row_table_got_default_clust_index(ib_table)) {
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	        if (primary_key >= MAX_KEY) {
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		  sql_print_error("Table %s has a primary key in InnoDB data "
				  "dictionary, but not in MySQL!", name);
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		}
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		((row_prebuilt_t*)innobase_prebuilt)
				->clust_index_was_generated = FALSE;
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 		/* MySQL allocates the buffer for ref. key_info->key_length
		includes space for all key columns + one byte for each column
		that may be NULL. ref_length must be as exact as possible to
		save space, because all row reference buffers are allocated
		based on ref_length. */
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  		ref_length = table->key_info[primary_key].key_length;
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	} else {
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	        if (primary_key != MAX_KEY) {
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		  sql_print_error("Table %s has no primary key in InnoDB data "
				  "dictionary, but has one in MySQL! If you "
				  "created the table with a MySQL version < "
				  "3.23.54 and did not define a primary key, "
				  "but defined a unique key with all non-NULL "
				  "columns, then MySQL internally treats that "
				  "key as the primary key. You can fix this "
				  "error by dump + DROP + CREATE + reimport "
				  "of the table.", name);
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		}

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		((row_prebuilt_t*)innobase_prebuilt)
				->clust_index_was_generated = TRUE;

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  		ref_length = DATA_ROW_ID_LEN;
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		/* If we automatically created the clustered index, then
		MySQL does not know about it, and MySQL must NOT be aware
		of the index used on scan, to make it avoid checking if we
		update the column of the index. That is why we assert below
		that key_used_on_scan is the undefined value MAX_KEY.
		The column is the row id in the automatical generation case,
		and it will never be updated anyway. */
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		if (key_used_on_scan != MAX_KEY) {
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		  sql_print_warning("Table %s key_used_on_scan is %lu even "
				    "though there is no primary key inside "
				    "InnoDB.", name, (ulong) key_used_on_scan);
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		}
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	}
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	block_size = 16 * 1024;	/* Index block size in InnoDB: used by MySQL
				in query optimization */

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	/* Init table lock structure */
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	thr_lock_data_init(&share->lock,&lock,(void*) 0);
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  	info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
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  	DBUG_RETURN(0);
}

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uint
ha_innobase::max_supported_key_part_length() const
{
	return(DICT_MAX_INDEX_COL_LEN - 1);
}

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/**********************************************************************
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Closes a handle to an InnoDB table. */
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int
ha_innobase::close(void)
/*====================*/
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				/* out: 0 */
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{
  	DBUG_ENTER("ha_innobase::close");

	row_prebuilt_free((row_prebuilt_t*) innobase_prebuilt);

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    	my_free((gptr) upd_buff, MYF(0));
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        free_share(share);

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	/* Tell InnoDB server that there might be work for
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	utility threads: */

	srv_active_wake_master_thread();

  	DBUG_RETURN(0);
}

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/* The following accessor functions should really be inside MySQL code! */

/******************************************************************
Gets field offset for a field in a table. */
inline
uint
get_field_offset(
/*=============*/
			/* out: offset */
	TABLE*	table,	/* in: MySQL table object */
	Field*	field)	/* in: MySQL field object */
{
	return((uint) (field->ptr - (char*) table->record[0]));
}

/******************************************************************
Checks if a field in a record is SQL NULL. Uses the record format
information in table to track the null bit in record. */
inline
uint
field_in_record_is_null(
/*====================*/
			/* out: 1 if NULL, 0 otherwise */
	TABLE*	table,	/* in: MySQL table object */
	Field*	field,	/* in: MySQL field object */
	char*	record)	/* in: a row in MySQL format */
{
	int	null_offset;

	if (!field->null_ptr) {

		return(0);
	}

	null_offset = (uint) ((char*) field->null_ptr
					- (char*) table->record[0]);

	if (record[null_offset] & field->null_bit) {

		return(1);
	}

	return(0);
}

/******************************************************************
Sets a field in a record to SQL NULL. Uses the record format
information in table to track the null bit in record. */
inline
void
set_field_in_record_to_null(
/*========================*/
	TABLE*	table,	/* in: MySQL table object */
	Field*	field,	/* in: MySQL field object */
	char*	record)	/* in: a row in MySQL format */
{
	int	null_offset;

	null_offset = (uint) ((char*) field->null_ptr
					- (char*) table->record[0]);

	record[null_offset] = record[null_offset] | field->null_bit;
}

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extern "C" {
/*****************************************************************
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InnoDB uses this function to compare two data fields for which the data type
is such that we must use MySQL code to compare them. NOTE that the prototype
of this function is in rem0cmp.c in InnoDB source code! If you change this
function, remember to update the prototype there! */
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int
innobase_mysql_cmp(
2404
/*===============*/
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					/* out: 1, 0, -1, if a is greater,
					equal, less than b, respectively */
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	int		mysql_type,	/* in: MySQL type */
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	uint		charset_number,	/* in: number of the charset */
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	unsigned char*	a,		/* in: data field */
	unsigned int	a_length,	/* in: data field length,
					not UNIV_SQL_NULL */
	unsigned char*	b,		/* in: data field */
	unsigned int	b_length)	/* in: data field length,
					not UNIV_SQL_NULL */
{
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	CHARSET_INFO*		charset;
2417
	enum_field_types	mysql_tp;
2418
	int                     ret;
2419

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	DBUG_ASSERT(a_length != UNIV_SQL_NULL);
	DBUG_ASSERT(b_length != UNIV_SQL_NULL);
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	mysql_tp = (enum_field_types) mysql_type;

	switch (mysql_tp) {

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        case MYSQL_TYPE_BIT:
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	case MYSQL_TYPE_STRING:
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	case MYSQL_TYPE_VAR_STRING:
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	case FIELD_TYPE_TINY_BLOB:
	case FIELD_TYPE_MEDIUM_BLOB:
	case FIELD_TYPE_BLOB:
	case FIELD_TYPE_LONG_BLOB:
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        case MYSQL_TYPE_VARCHAR:
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		/* Use the charset number to pick the right charset struct for
		the comparison. Since the MySQL function get_charset may be
		slow before Bar removes the mutex operation there, we first
		look at 2 common charsets directly. */

		if (charset_number == default_charset_info->number) {
			charset = default_charset_info;
		} else if (charset_number == my_charset_latin1.number) {
			charset = &my_charset_latin1;
		} else {
			charset = get_charset(charset_number, MYF(MY_WME));

			if (charset == NULL) {
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			  sql_print_error("InnoDB needs charset %lu for doing "
					  "a comparison, but MySQL cannot "
					  "find that charset.",
					  (ulong) charset_number);
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				ut_a(0);
			}
		}

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                /* Starting from 4.1.3, we use strnncollsp() in comparisons of
                non-latin1_swedish_ci strings. NOTE that the collation order
                changes then: 'b\0\0...' is ordered BEFORE 'b  ...'. Users
                having indexes on such data need to rebuild their tables! */

                ret = charset->coll->strnncollsp(charset,
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                                  a, a_length,
2463
                                                 b, b_length, 0);
2464
		if (ret < 0) {
2465
		        return(-1);
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		} else if (ret > 0) {
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		        return(1);
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		} else {
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		        return(0);
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	        }
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	default:
		assert(0);
	}

	return(0);
}
}

/******************************************************************
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Converts a MySQL type to an InnoDB type. Note that this function returns
the 'mtype' of InnoDB. InnoDB differentiates between MySQL's old <= 4.1
VARCHAR and the new true VARCHAR in >= 5.0.3 by the 'prtype'. */
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inline
ulint
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get_innobase_type_from_mysql_type(
/*==============================*/
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				/* out: DATA_BINARY, DATA_VARCHAR, ... */
	ulint*	unsigned_flag,	/* out: DATA_UNSIGNED if an 'unsigned type';
				at least ENUM and SET, and unsigned integer
				types are 'unsigned types' */
	Field*	field)		/* in: MySQL field */
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{
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	/* The following asserts try to check that the MySQL type code fits in
	8 bits: this is used in ibuf and also when DATA_NOT_NULL is ORed to
	the type */
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	DBUG_ASSERT((ulint)FIELD_TYPE_STRING < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_VAR_STRING < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_DOUBLE < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_FLOAT < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_DECIMAL < 256);

	if (field->flags & UNSIGNED_FLAG) {

		*unsigned_flag = DATA_UNSIGNED;
	} else {
		*unsigned_flag = 0;
	}

	if (field->real_type() == FIELD_TYPE_ENUM
	    || field->real_type() == FIELD_TYPE_SET) {

		/* MySQL has field->type() a string type for these, but the
		data is actually internally stored as an unsigned integer
		code! */

		*unsigned_flag = DATA_UNSIGNED; /* MySQL has its own unsigned
						flag set to zero, even though
						internally this is an unsigned
						integer type */
		return(DATA_INT);
	}

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	switch (field->type()) {
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	        /* NOTE that we only allow string types in DATA_MYSQL
		and DATA_VARMYSQL */
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                case MYSQL_TYPE_VAR_STRING: /* old <= 4.1 VARCHAR */
                case MYSQL_TYPE_VARCHAR:    /* new >= 5.0.3 true VARCHAR */
					if (field->binary()) {
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						return(DATA_BINARY);
					} else if (strcmp(
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						  field->charset()->name,
						 "latin1_swedish_ci") == 0) {
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						return(DATA_VARCHAR);
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					} else {
						return(DATA_VARMYSQL);
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					}
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                case MYSQL_TYPE_BIT:
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		case MYSQL_TYPE_STRING: if (field->binary()) {
2540 2541 2542

						return(DATA_FIXBINARY);
					} else if (strcmp(
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						   field->charset()->name,
						   "latin1_swedish_ci") == 0) {
2545
						return(DATA_CHAR);
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					} else {
						return(DATA_MYSQL);
2548
					}
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                case FIELD_TYPE_NEWDECIMAL:
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                                        return(DATA_FIXBINARY);
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		case FIELD_TYPE_LONG:
		case FIELD_TYPE_LONGLONG:
		case FIELD_TYPE_TINY:
		case FIELD_TYPE_SHORT:
		case FIELD_TYPE_INT24:
		case FIELD_TYPE_DATE:
		case FIELD_TYPE_DATETIME:
		case FIELD_TYPE_YEAR:
		case FIELD_TYPE_NEWDATE:
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		case FIELD_TYPE_TIME:
		case FIELD_TYPE_TIMESTAMP:
					return(DATA_INT);
2563
		case FIELD_TYPE_FLOAT:
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					return(DATA_FLOAT);
2565
		case FIELD_TYPE_DOUBLE:
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					return(DATA_DOUBLE);
2567
		case FIELD_TYPE_DECIMAL:
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					return(DATA_DECIMAL);
2569
		case FIELD_TYPE_GEOMETRY:
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		case FIELD_TYPE_TINY_BLOB:
		case FIELD_TYPE_MEDIUM_BLOB:
		case FIELD_TYPE_BLOB:
		case FIELD_TYPE_LONG_BLOB:
					return(DATA_BLOB);
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		default:
					assert(0);
	}

	return(0);
}
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/***********************************************************************
Writes an unsigned integer value < 64k to 2 bytes, in the little-endian
storage format. */
inline
void
innobase_write_to_2_little_endian(
/*==============================*/
	byte*	buf,	/* in: where to store */
	ulint	val)	/* in: value to write, must be < 64k */
{
	ut_a(val < 256 * 256);

	buf[0] = (byte)(val & 0xFF);
	buf[1] = (byte)(val / 256);
}

/***********************************************************************
Reads an unsigned integer value < 64k from 2 bytes, in the little-endian
storage format. */
inline
uint
innobase_read_from_2_little_endian(
/*===============================*/
			/* out: value */
	const mysql_byte*	buf)	/* in: from where to read */
{
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	return (uint) ((ulint)(buf[0]) + 256 * ((ulint)(buf[1])));
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}

2611
/***********************************************************************
2612
Stores a key value for a row to a buffer. */
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uint
ha_innobase::store_key_val_for_row(
/*===============================*/
				/* out: key value length as stored in buff */
	uint 		keynr,	/* in: key number */
	char*		buff,	/* in/out: buffer for the key value (in MySQL
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				format) */
	uint		buff_len,/* in: buffer length */
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	const mysql_byte* record)/* in: row in MySQL format */
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{
	KEY*		key_info 	= table->key_info + keynr;
  	KEY_PART_INFO*	key_part	= key_info->key_part;
  	KEY_PART_INFO*	end		= key_part + key_info->key_parts;
	char*		buff_start	= buff;
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	enum_field_types mysql_type;
	Field*		field;
	ibool		is_null;
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  	DBUG_ENTER("store_key_val_for_row");

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	/* The format for storing a key field in MySQL is the following:

	1. If the column can be NULL, then in the first byte we put 1 if the
	field value is NULL, 0 otherwise.

	2. If the column is of a BLOB type (it must be a column prefix field
	in this case), then we put the length of the data in the field to the
	next 2 bytes, in the little-endian format. If the field is SQL NULL,
	then these 2 bytes are set to 0. Note that the length of data in the
	field is <= column prefix length.

	3. In a column prefix field, prefix_len next bytes are reserved for
	data. In a normal field the max field length next bytes are reserved
	for data. For a VARCHAR(n) the max field length is n. If the stored
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	value is the SQL NULL then these data bytes are set to 0.
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	4. We always use a 2 byte length for a true >= 5.0.3 VARCHAR. Note that
	in the MySQL row format, the length is stored in 1 or 2 bytes,
	depending on the maximum allowed length. But in the MySQL key value
	format, the length always takes 2 bytes.

	We have to zero-fill the buffer so that MySQL is able to use a
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	simple memcmp to compare two key values to determine if they are
	equal. MySQL does this to compare contents of two 'ref' values. */
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2659
	bzero(buff, buff_len);
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2661
  	for (; key_part != end; key_part++) {
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	        is_null = FALSE;
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    		if (key_part->null_bit) {
      			if (record[key_part->null_offset]
						& key_part->null_bit) {
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				*buff = 1;
				is_null = TRUE;
      			} else {
				*buff = 0;
			}
			buff++;
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    		}
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		field = key_part->field;
		mysql_type = field->type();

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		if (mysql_type == MYSQL_TYPE_VARCHAR) {
						/* >= 5.0.3 true VARCHAR */
			ulint	lenlen;
			ulint	len;
			byte*	data;
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			ulint	key_len;
2684
			ulint	true_len;
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			CHARSET_INFO*	cs;
			int	error=0;
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			key_len = key_part->length;

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			if (is_null) {
2691
				buff += key_len + 2;
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				continue;
			}
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			cs = field->charset();
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			lenlen = (ulint)
				(((Field_varstring*)field)->length_bytes);

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			data = row_mysql_read_true_varchar(&len,
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				(byte*) (record
				+ (ulint)get_field_offset(table, field)),
				lenlen);
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			true_len = len;

			/* For multi byte character sets we need to calculate
			the true length of the key */

			if (len > 0 && cs->mbmaxlen > 1) {
				true_len = (ulint) cs->cset->well_formed_len(cs,
						(const char *) data,
						(const char *) data + len,
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                                                (uint) (key_len /
                                                        cs->mbmaxlen),
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						&error);
			}

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			/* In a column prefix index, we may need to truncate
			the stored value: */
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			if (true_len > key_len) {
				true_len = key_len;
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			}

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			/* The length in a key value is always stored in 2
			bytes */

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			row_mysql_store_true_var_len((byte*)buff, true_len, 2);
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			buff += 2;

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			memcpy(buff, data, true_len);
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			/* Note that we always reserve the maximum possible
			length of the true VARCHAR in the key value, though
			only len first bytes after the 2 length bytes contain
			actual data. The rest of the space was reset to zero
			in the bzero() call above. */

2740
			buff += key_len;
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		} else if (mysql_type == FIELD_TYPE_TINY_BLOB
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		    || mysql_type == FIELD_TYPE_MEDIUM_BLOB
		    || mysql_type == FIELD_TYPE_BLOB
		    || mysql_type == FIELD_TYPE_LONG_BLOB) {
2746

2747 2748
			CHARSET_INFO*	cs;
			ulint		key_len;
2749
			ulint		true_len;
2750
			int		error=0;
2751 2752
			ulint		blob_len;
			byte*		blob_data;
2753

2754
			ut_a(key_part->key_part_flag & HA_PART_KEY_SEG);
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2756 2757
			key_len = key_part->length;

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		        if (is_null) {
2759
				buff += key_len + 2;
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2760

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2761
				continue;
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			}
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2764 2765
			cs = field->charset();

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		        blob_data = row_mysql_read_blob_ref(&blob_len,
				(byte*) (record
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				+ (ulint)get_field_offset(table, field)),
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					(ulint) field->pack_length());

2771 2772
			true_len = blob_len;

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			ut_a(get_field_offset(table, field)
						     == key_part->offset);
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2775

2776 2777
			/* For multi byte character sets we need to calculate
			the true length of the key */
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2778

2779 2780 2781
			if (blob_len > 0 && cs->mbmaxlen > 1) {
				true_len = (ulint) cs->cset->well_formed_len(cs,
						(const char *) blob_data,
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2782
						(const char *) blob_data
2783
							+ blob_len,
2784 2785
                                                (uint) (key_len /
                                                        cs->mbmaxlen),
2786 2787 2788
						&error);
			}

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			/* All indexes on BLOB and TEXT are column prefix
			indexes, and we may need to truncate the data to be
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2791
			stored in the key value: */
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2793 2794
			if (true_len > key_len) {
				true_len = key_len;
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			}

			/* MySQL reserves 2 bytes for the length and the
			storage of the number is little-endian */

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			innobase_write_to_2_little_endian(
2801
					(byte*)buff, true_len);
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			buff += 2;

2804
			memcpy(buff, blob_data, true_len);
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2805

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			/* Note that we always reserve the maximum possible
			length of the BLOB prefix in the key value. */

2809
			buff += key_len;
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2810
		} else {
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			/* Here we handle all other data types except the
			true VARCHAR, BLOB and TEXT. Note that the column
			value we store may be also in a column prefix
			index. */

2816
			CHARSET_INFO*		cs;
2817 2818
			ulint			true_len;
			ulint			key_len;
2819 2820
			const mysql_byte*	src_start;
			int			error=0;
2821 2822 2823
			enum_field_types	real_type;

			key_len = key_part->length;
2824

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2825
		        if (is_null) {
2826
				 buff += key_len;
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2827

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				 continue;
			}
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2830

2831
			src_start = record + key_part->offset;
2832 2833 2834 2835 2836 2837 2838 2839
			real_type = field->real_type();
			true_len = key_len;

			/* Character set for the field is defined only
			to fields whose type is string and real field
			type is not enum or set. For these fields check
			if character set is multi byte. */

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2840
			if (real_type != FIELD_TYPE_ENUM
2841 2842 2843 2844 2845 2846
				&& real_type != FIELD_TYPE_SET
				&& ( mysql_type == MYSQL_TYPE_VAR_STRING
					|| mysql_type == MYSQL_TYPE_STRING)) {

				cs = field->charset();

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2847
				/* For multi byte character sets we need to
2848 2849 2850 2851
				calculate the true length of the key */

				if (key_len > 0 && cs->mbmaxlen > 1) {

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2852
					true_len = (ulint)
2853 2854
						cs->cset->well_formed_len(cs,
							(const char *)src_start,
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2855
							(const char *)src_start
2856
								+ key_len,
2857 2858
                                                        (uint) (key_len /
                                                                cs->mbmaxlen),
2859 2860
							&error);
				}
2861 2862
			}

2863 2864
			memcpy(buff, src_start, true_len);
			buff += true_len;
2865

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2866 2867 2868
			/* Pad the unused space with spaces. Note that no
			padding is ever needed for UCS-2 because in MySQL,
			all UCS2 characters are 2 bytes, as MySQL does not
2869 2870
			support surrogate pairs, which are needed to represent
			characters in the range U+10000 to U+10FFFF. */
2871

2872 2873 2874 2875
			if (true_len < key_len) {
				ulint pad_len = key_len - true_len;
				memset(buff, ' ', pad_len);
				buff += pad_len;
2876
			}
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2877
		}
2878 2879
  	}

2880
	ut_a(buff <= buff_start + buff_len);
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2881 2882

	DBUG_RETURN((uint)(buff - buff_start));
2883 2884 2885
}

/******************************************************************
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2886 2887
Builds a 'template' to the prebuilt struct. The template is used in fast
retrieval of just those column values MySQL needs in its processing. */
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2888
static
2889
void
2890 2891 2892 2893 2894 2895 2896 2897 2898
build_template(
/*===========*/
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct */
	THD*		thd,		/* in: current user thread, used
					only if templ_type is
					ROW_MYSQL_REC_FIELDS */
	TABLE*		table,		/* in: MySQL table */
	ulint		templ_type)	/* in: ROW_MYSQL_WHOLE_ROW or
					ROW_MYSQL_REC_FIELDS */
2899
{
2900 2901
	dict_index_t*	index;
	dict_index_t*	clust_index;
2902
	mysql_row_templ_t* templ;
2903
	Field*		field;
2904 2905
	ulint		n_fields;
	ulint		n_requested_fields	= 0;
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2906
	ibool		fetch_all_in_key	= FALSE;
2907
	ibool		fetch_primary_key_cols	= FALSE;
2908
	ulint		i;
2909 2910
	/* byte offset of the end of last requested column */
	ulint		mysql_prefix_len	= 0;
2911

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2912 2913 2914 2915
	if (prebuilt->select_lock_type == LOCK_X) {
		/* We always retrieve the whole clustered index record if we
		use exclusive row level locks, for example, if the read is
		done in an UPDATE statement. */
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2916

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2917 2918 2919
	        templ_type = ROW_MYSQL_WHOLE_ROW;
	}

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2920 2921 2922
	if (templ_type == ROW_MYSQL_REC_FIELDS) {
	     if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_ALL_COLS) {
2923

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2924 2925
		/* We know we must at least fetch all columns in the key, or
		all columns in the table */
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2926

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Merge  
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2927
		if (prebuilt->read_just_key) {
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			/* MySQL has instructed us that it is enough to
2929 2930 2931 2932 2933
			fetch the columns in the key; looks like MySQL
			can set this flag also when there is only a
			prefix of the column in the key: in that case we
			retrieve the whole column from the clustered
			index */
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2934

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2935 2936 2937 2938
			fetch_all_in_key = TRUE;
		} else {
			templ_type = ROW_MYSQL_WHOLE_ROW;
		}
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2939 2940
	    } else if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_PRIMARY_KEY) {
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2941 2942 2943 2944 2945
		/* We must at least fetch all primary key cols. Note that if
		the clustered index was internally generated by InnoDB on the
		row id (no primary key was defined), then
		row_search_for_mysql() will always retrieve the row id to a
		special buffer in the prebuilt struct. */
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2946 2947 2948

		fetch_primary_key_cols = TRUE;
	    }
2949 2950
	}

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2951
	clust_index = dict_table_get_first_index_noninline(prebuilt->table);
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2952

2953
	if (templ_type == ROW_MYSQL_REC_FIELDS) {
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2954
		index = prebuilt->index;
2955 2956
	} else {
		index = clust_index;
2957
	}
2958

2959 2960 2961 2962 2963 2964 2965
	if (index == clust_index) {
		prebuilt->need_to_access_clustered = TRUE;
	} else {
		prebuilt->need_to_access_clustered = FALSE;
		/* Below we check column by column if we need to access
		the clustered index */
	}
2966

2967
	n_fields = (ulint)table->s->fields; /* number of columns */
2968 2969 2970 2971 2972 2973

	if (!prebuilt->mysql_template) {
		prebuilt->mysql_template = (mysql_row_templ_t*)
						mem_alloc_noninline(
					n_fields * sizeof(mysql_row_templ_t));
	}
2974

2975
	prebuilt->template_type = templ_type;
2976
	prebuilt->null_bitmap_len = table->s->null_bytes;
2977

2978 2979
	prebuilt->templ_contains_blob = FALSE;

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2980 2981
	/* Note that in InnoDB, i is the column number. MySQL calls columns
	'fields'. */
2982
	for (i = 0; i < n_fields; i++) {
2983
		templ = prebuilt->mysql_template + n_requested_fields;
2984 2985
		field = table->field[i];

2986 2987 2988 2989 2990
		if (UNIV_LIKELY(templ_type == ROW_MYSQL_REC_FIELDS)) {
			/* Decide which columns we should fetch
			and which we can skip. */
			register const ibool	index_contains_field =
				dict_index_contains_col_or_prefix(index, i);
2991

2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017
			if (!index_contains_field && prebuilt->read_just_key) {
				/* If this is a 'key read', we do not need
				columns that are not in the key */

				goto skip_field;
			}

			if (index_contains_field && fetch_all_in_key) {
				/* This field is needed in the query */

				goto include_field;
			}

			if (thd->query_id == field->query_id) {
				/* This field is needed in the query */

				goto include_field;
			}

			if (fetch_primary_key_cols
			    && dict_table_col_in_clustered_key(index->table,
									i)) {
				/* This field is needed in the query */

				goto include_field;
			}
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3018 3019

			/* This field is not needed in the query, skip it */
3020 3021 3022

			goto skip_field;
		}
3023
include_field:
3024
		n_requested_fields++;
3025

3026
		templ->col_no = i;
3027

3028 3029 3030
		if (index == clust_index) {
			templ->rec_field_no = (index->table->cols + i)
								->clust_pos;
3031
		} else {
3032 3033
			templ->rec_field_no = dict_index_get_nth_col_pos(
								index, i);
3034 3035
		}

3036 3037 3038 3039 3040 3041 3042 3043
		if (templ->rec_field_no == ULINT_UNDEFINED) {
			prebuilt->need_to_access_clustered = TRUE;
		}

		if (field->null_ptr) {
			templ->mysql_null_byte_offset =
				(ulint) ((char*) field->null_ptr
					- (char*) table->record[0]);
3044

3045 3046 3047 3048
			templ->mysql_null_bit_mask = (ulint) field->null_bit;
		} else {
			templ->mysql_null_bit_mask = 0;
		}
3049

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3050 3051 3052
		templ->mysql_col_offset = (ulint)
					get_field_offset(table, field);

3053
		templ->mysql_col_len = (ulint) field->pack_length();
3054 3055 3056 3057 3058
		if (mysql_prefix_len < templ->mysql_col_offset
				+ templ->mysql_col_len) {
			mysql_prefix_len = templ->mysql_col_offset
				+ templ->mysql_col_len;
		}
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3059
		templ->type = index->table->cols[i].type.mtype;
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3060 3061 3062 3063 3064 3065
		templ->mysql_type = (ulint)field->type();

		if (templ->mysql_type == DATA_MYSQL_TRUE_VARCHAR) {
			templ->mysql_length_bytes = (ulint)
				    (((Field_varstring*)field)->length_bytes);
		}
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3066

3067 3068
		templ->charset = dtype_get_charset_coll_noninline(
				index->table->cols[i].type.prtype);
3069 3070
		templ->mbminlen = index->table->cols[i].type.mbminlen;
		templ->mbmaxlen = index->table->cols[i].type.mbmaxlen;
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3071 3072
		templ->is_unsigned = index->table->cols[i].type.prtype
							& DATA_UNSIGNED;
3073 3074
		if (templ->type == DATA_BLOB) {
			prebuilt->templ_contains_blob = TRUE;
3075
		}
3076 3077 3078
skip_field:
		;
	}
3079

3080
	prebuilt->n_template = n_requested_fields;
3081
	prebuilt->mysql_prefix_len = mysql_prefix_len;
3082

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3083
	if (index != clust_index && prebuilt->need_to_access_clustered) {
3084 3085 3086 3087
		/* Change rec_field_no's to correspond to the clustered index
		record */
		for (i = 0; i < n_requested_fields; i++) {
			templ = prebuilt->mysql_template + i;
3088

3089 3090 3091
			templ->rec_field_no =
			    (index->table->cols + templ->col_no)->clust_pos;
		}
3092
	}
3093 3094 3095
}

/************************************************************************
3096
Stores a row in an InnoDB database, to the table specified in this
3097 3098 3099 3100 3101
handle. */

int
ha_innobase::write_row(
/*===================*/
3102 3103
				/* out: error code */
	mysql_byte* 	record)	/* in: a row in MySQL format */
3104
{
3105
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
3106
  	int 		error;
3107
	longlong	auto_inc;
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3108
	longlong	dummy;
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3109
	ibool           auto_inc_used= FALSE;
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3110

3111
  	DBUG_ENTER("ha_innobase::write_row");
3112

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3113
	if (prebuilt->trx !=
3114
                        (trx_t*) current_thd->ha_data[innobase_hton.slot]) {
3115 3116 3117 3118
	  sql_print_error("The transaction object for the table handle is at "
			  "%p, but for the current thread it is at %p",
			  prebuilt->trx,
			  (trx_t*) current_thd->ha_data[innobase_hton.slot]);
3119

3120 3121 3122 3123 3124 3125
		fputs("InnoDB: Dump of 200 bytes around prebuilt: ", stderr);
		ut_print_buf(stderr, ((const byte*)prebuilt) - 100, 200);
		fputs("\n"
			"InnoDB: Dump of 200 bytes around transaction.all: ",
			stderr);
		ut_print_buf(stderr,
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3126 3127
           	 ((byte*)(&(current_thd->ha_data[innobase_hton.slot]))) - 100,
								200);
3128 3129
		putc('\n', stderr);
		ut_error;
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3130
	}
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3131

3132 3133
  	statistic_increment(current_thd->status_var.ha_write_count,
			    &LOCK_status);
3134

3135 3136
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
                table->timestamp_field->set_time();
3137

3138
	if ((user_thd->lex->sql_command == SQLCOM_ALTER_TABLE
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3139
	    || user_thd->lex->sql_command == SQLCOM_OPTIMIZE
3140 3141
	    || user_thd->lex->sql_command == SQLCOM_CREATE_INDEX
	    || user_thd->lex->sql_command == SQLCOM_DROP_INDEX)
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3142
	    && num_write_row >= 10000) {
3143 3144 3145 3146 3147 3148 3149 3150
		/* ALTER TABLE is COMMITted at every 10000 copied rows.
		The IX table lock for the original table has to be re-issued.
		As this method will be called on a temporary table where the
		contents of the original table is being copied to, it is
		a bit tricky to determine the source table.  The cursor
		position in the source table need not be adjusted after the
		intermediate COMMIT, since writes by other transactions are
		being blocked by a MySQL table lock TL_WRITE_ALLOW_READ. */
3151

3152
		dict_table_t*	src_table;
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3153
		ulint		mode;
3154

3155
		num_write_row = 0;
3156

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3157 3158
		/* Commit the transaction.  This will release the table
		locks, so they have to be acquired again. */
3159 3160 3161 3162 3163 3164

		/* Altering an InnoDB table */
		/* Get the source table. */
		src_table = lock_get_src_table(
				prebuilt->trx, prebuilt->table, &mode);
		if (!src_table) {
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3165
no_commit:
3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178
			/* Unknown situation: do not commit */
			/*
			ut_print_timestamp(stderr);
			fprintf(stderr,
				"  InnoDB error: ALTER TABLE is holding lock"
				" on %lu tables!\n",
				prebuilt->trx->mysql_n_tables_locked);
			*/
			;
		} else if (src_table == prebuilt->table) {
			/* Source table is not in InnoDB format:
			no need to re-acquire locks on it. */

3179
			/* Altering to InnoDB format */
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3180
                        innobase_commit(user_thd, 1);
3181
			/* Note that this transaction is still active. */
3182
			prebuilt->trx->active_trans = 1;
3183 3184
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
3185 3186 3187
		} else {
			/* Ensure that there are no other table locks than
			LOCK_IX and LOCK_AUTO_INC on the destination table. */
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3188

3189 3190
			if (!lock_is_table_exclusive(prebuilt->table,
							prebuilt->trx)) {
3191 3192 3193 3194 3195
				goto no_commit;
			}

			/* Commit the transaction.  This will release the table
			locks, so they have to be acquired again. */
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3196
                        innobase_commit(user_thd, 1);
3197
			/* Note that this transaction is still active. */
3198
			prebuilt->trx->active_trans = 1;
3199
			/* Re-acquire the table lock on the source table. */
3200
			row_lock_table_for_mysql(prebuilt, src_table, mode);
3201 3202 3203
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
		}
3204 3205
	}

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3206 3207
	num_write_row++;

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3208 3209 3210
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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3211 3212

		innobase_release_stat_resources(prebuilt->trx);
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3213 3214
	}

3215
  	if (table->next_number_field && record == table->record[0]) {
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3216 3217
		/* This is the case where the table has an
		auto-increment column */
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		/* Initialize the auto-inc counter if it has not been
		initialized yet */

		if (0 == dict_table_autoinc_peek(prebuilt->table)) {

			/* This call initializes the counter */
		        error = innobase_read_and_init_auto_inc(&dummy);

			if (error) {
				/* Deadlock or lock wait timeout */

				goto func_exit;
			}

			/* We have to set sql_stat_start to TRUE because
			the above call probably has called a select, and
			has reset that flag; row_insert_for_mysql has to
			know to set the IX intention lock on the table,
			something it only does at the start of each
			statement */

			prebuilt->sql_stat_start = TRUE;
		}

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		/* We have to use the transactional lock mechanism on the
		auto-inc counter of the table to ensure that replication and
		roll-forward of the binlog exactly imitates also the given
		auto-inc values. The lock is released at each SQL statement's
		end. This lock also prevents a race where two threads would
		call ::get_auto_increment() simultaneously. */

		error = row_lock_table_autoinc_for_mysql(prebuilt);

		if (error != DB_SUCCESS) {
			/* Deadlock or lock wait timeout */

			error = convert_error_code_to_mysql(error, user_thd);

			goto func_exit;
		}

		/* We must use the handler code to update the auto-increment
                value to be sure that we increment it correctly. */

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    		if ((error= update_auto_increment()))
			goto func_exit;
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                auto_inc_used = 1;
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3266

3267
	}
3268

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	if (prebuilt->mysql_template == NULL
			|| prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {
		/* Build the template used in converting quickly between
		the two database formats */
3273

3274 3275
		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}
3276

3277
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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3279
	error = row_insert_for_mysql((byte*) record, prebuilt);
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3281
	if (error == DB_SUCCESS && auto_inc_used) {
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3282

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        	/* Fetch the value that was set in the autoincrement field */
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          	auto_inc = table->next_number_field->val_int();
3286

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          	if (auto_inc != 0) {
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			/* This call will update the counter according to the
			value that was inserted in the table */
3290

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            		dict_table_autoinc_update(prebuilt->table, auto_inc);
          	}
3293
        }
3294

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        /* A REPLACE command and LOAD DATA INFILE REPLACE handle a duplicate
        key error themselves, and we must update the autoinc counter if we are
        performing those statements. */

        if (error == DB_DUPLICATE_KEY && auto_inc_used
            && (user_thd->lex->sql_command == SQLCOM_REPLACE
                || user_thd->lex->sql_command == SQLCOM_REPLACE_SELECT
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                || (user_thd->lex->sql_command == SQLCOM_INSERT
                    && user_thd->lex->duplicates == DUP_UPDATE)
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                || (user_thd->lex->sql_command == SQLCOM_LOAD
                    && user_thd->lex->duplicates == DUP_REPLACE))) {

                auto_inc = table->next_number_field->val_int();

                if (auto_inc != 0) {
                        dict_table_autoinc_update(prebuilt->table, auto_inc);
                }
        }

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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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3315

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	error = convert_error_code_to_mysql(error, user_thd);
3317

3318
	/* Tell InnoDB server that there might be work for
3319
	utility threads: */
3320
func_exit:
3321
	innobase_active_small();
3322 3323 3324 3325

  	DBUG_RETURN(error);
}

3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336
/**************************************************************************
Checks which fields have changed in a row and stores information
of them to an update vector. */
static
int
calc_row_difference(
/*================*/
					/* out: error number or 0 */
	upd_t*		uvect,		/* in/out: update vector */
	mysql_byte* 	old_row,	/* in: old row in MySQL format */
	mysql_byte* 	new_row,	/* in: new row in MySQL format */
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	struct st_table* table,		/* in: table in MySQL data
					dictionary */
3339
	mysql_byte*	upd_buff,	/* in: buffer to use */
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	ulint		buff_len,	/* in: buffer length */
3341
	row_prebuilt_t*	prebuilt,	/* in: InnoDB prebuilt struct */
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	THD*		thd)		/* in: user thread */
{
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	mysql_byte*	original_upd_buff = upd_buff;
3345
	Field*		field;
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	enum_field_types field_mysql_type;
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	uint		n_fields;
	ulint		o_len;
	ulint		n_len;
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	ulint		col_pack_len;
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	byte*		new_mysql_row_col;
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	byte*	        o_ptr;
        byte*	        n_ptr;
        byte*	        buf;
3355
	upd_field_t*	ufield;
3356
	ulint		col_type;
3357
	ulint		n_changed = 0;
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	dfield_t	dfield;
3359
	uint		i;
3360

3361
	n_fields = table->s->fields;
3362

3363
	/* We use upd_buff to convert changed fields */
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	buf = (byte*) upd_buff;
3365

3366 3367 3368
	for (i = 0; i < n_fields; i++) {
		field = table->field[i];

3369
		/* if (thd->query_id != field->query_id) { */
3370 3371
			/* TODO: check that these fields cannot have
			changed! */
3372

3373 3374
		/*	goto skip_field;
		}*/
3375

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		o_ptr = (byte*) old_row + get_field_offset(table, field);
		n_ptr = (byte*) new_row + get_field_offset(table, field);
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		/* Use new_mysql_row_col and col_pack_len save the values */

		new_mysql_row_col = n_ptr;
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		col_pack_len = field->pack_length();
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		o_len = col_pack_len;
		n_len = col_pack_len;
3386

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		/* We use o_ptr and n_ptr to dig up the actual data for
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		comparison. */
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		field_mysql_type = field->type();
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		col_type = prebuilt->table->cols[i].type.mtype;
3393 3394 3395 3396 3397 3398

		switch (col_type) {

		case DATA_BLOB:
			o_ptr = row_mysql_read_blob_ref(&o_len, o_ptr, o_len);
			n_ptr = row_mysql_read_blob_ref(&n_len, n_ptr, n_len);
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3400
			break;
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3402 3403 3404
		case DATA_VARCHAR:
		case DATA_BINARY:
		case DATA_VARMYSQL:
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			if (field_mysql_type == MYSQL_TYPE_VARCHAR) {
				/* This is a >= 5.0.3 type true VARCHAR where
				the real payload data length is stored in
				1 or 2 bytes */
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				o_ptr = row_mysql_read_true_varchar(
						&o_len, o_ptr,
				    (ulint)
				    (((Field_varstring*)field)->length_bytes));
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				n_ptr = row_mysql_read_true_varchar(
						&n_len, n_ptr,
				    (ulint)
				    (((Field_varstring*)field)->length_bytes));
			}

			break;
3422 3423 3424
		default:
			;
		}
3425

3426
		if (field->null_ptr) {
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			if (field_in_record_is_null(table, field,
							(char*) old_row)) {
3429 3430
				o_len = UNIV_SQL_NULL;
			}
3431

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			if (field_in_record_is_null(table, field,
							(char*) new_row)) {
3434 3435 3436 3437 3438 3439 3440 3441 3442
				n_len = UNIV_SQL_NULL;
			}
		}

		if (o_len != n_len || (o_len != UNIV_SQL_NULL &&
					0 != memcmp(o_ptr, n_ptr, o_len))) {
			/* The field has changed */

			ufield = uvect->fields + n_changed;
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3443

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			/* Let us use a dummy dfield to make the conversion
			from the MySQL column format to the InnoDB format */

			dfield.type = (prebuilt->table->cols + i)->type;

			if (n_len != UNIV_SQL_NULL) {
				buf = row_mysql_store_col_in_innobase_format(
						&dfield,
						(byte*)buf,
						TRUE,
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						new_mysql_row_col,
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						col_pack_len,
						prebuilt->table->comp);
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				ufield->new_val.data = dfield.data;
				ufield->new_val.len = dfield.len;
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			} else {
				ufield->new_val.data = NULL;
				ufield->new_val.len = UNIV_SQL_NULL;
			}
3463 3464

			ufield->exp = NULL;
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			ufield->field_no = prebuilt->table->cols[i].clust_pos;
3466 3467 3468 3469 3470 3471 3472
			n_changed++;
		}
	}

	uvect->n_fields = n_changed;
	uvect->info_bits = 0;

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	ut_a(buf <= (byte*)original_upd_buff + buff_len);

3475 3476 3477 3478 3479 3480 3481
	return(0);
}

/**************************************************************************
Updates a row given as a parameter to a new value. Note that we are given
whole rows, not just the fields which are updated: this incurs some
overhead for CPU when we check which fields are actually updated.
3482
TODO: currently InnoDB does not prevent the 'Halloween problem':
3483 3484
in a searched update a single row can get updated several times
if its index columns are updated! */
3485

3486 3487 3488 3489
int
ha_innobase::update_row(
/*====================*/
					/* out: error number or 0 */
3490 3491
	const mysql_byte* 	old_row,/* in: old row in MySQL format */
	mysql_byte* 		new_row)/* in: new row in MySQL format */
3492 3493 3494 3495 3496
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	upd_t*		uvect;
	int		error = 0;

3497
	DBUG_ENTER("ha_innobase::update_row");
3498

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	ut_ad(prebuilt->trx ==
3500
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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3502 3503
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
                table->timestamp_field->set_time();
3504

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	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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		innobase_release_stat_resources(prebuilt->trx);
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	}

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	if (prebuilt->upd_node) {
		uvect = prebuilt->upd_node->update;
	} else {
		uvect = row_get_prebuilt_update_vector(prebuilt);
	}
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	/* Build an update vector from the modified fields in the rows
	(uses upd_buff of the handle) */

3521
	calc_row_difference(uvect, (mysql_byte*) old_row, new_row, table,
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			upd_buff, (ulint)upd_and_key_val_buff_len,
			prebuilt, user_thd);

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	/* This is not a delete */
	prebuilt->upd_node->is_delete = FALSE;

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	assert(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW);
3529

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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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3532
	error = row_update_for_mysql((byte*) old_row, prebuilt);
3533

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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	error = convert_error_code_to_mysql(error, user_thd);
3537

3538
	/* Tell InnoDB server that there might be work for
3539 3540
	utility threads: */

3541
	innobase_active_small();
3542 3543 3544 3545 3546 3547 3548 3549 3550 3551

	DBUG_RETURN(error);
}

/**************************************************************************
Deletes a row given as the parameter. */

int
ha_innobase::delete_row(
/*====================*/
3552 3553
					/* out: error number or 0 */
	const mysql_byte* record)	/* in: a row in MySQL format */
3554 3555 3556 3557
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error = 0;

3558
	DBUG_ENTER("ha_innobase::delete_row");
3559

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	ut_ad(prebuilt->trx ==
3561
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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		innobase_release_stat_resources(prebuilt->trx);
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	}

3570 3571 3572
	if (!prebuilt->upd_node) {
		row_get_prebuilt_update_vector(prebuilt);
	}
3573 3574

	/* This is a delete */
3575

3576
	prebuilt->upd_node->is_delete = TRUE;
3577

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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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3579

3580
	error = row_update_for_mysql((byte*) record, prebuilt);
3581

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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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3583

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	error = convert_error_code_to_mysql(error, user_thd);
3585

3586
	/* Tell the InnoDB server that there might be work for
3587 3588
	utility threads: */

3589
	innobase_active_small();
3590 3591 3592 3593

	DBUG_RETURN(error);
}

3594
/**************************************************************************
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3595
Removes a new lock set on a row. This method does nothing unless the
3596
option innodb_locks_unsafe_for_binlog is set.*/
3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607

void
ha_innobase::unlock_row(void)
/*=========================*/
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;

	DBUG_ENTER("ha_innobase::unlock_row");

	if (last_query_id != user_thd->query_id) {
		ut_print_timestamp(stderr);
3608 3609 3610
		sql_print_error("last_query_id is %lu != user_thd_query_id is "
				"%lu", (ulong) last_query_id,
				(ulong) user_thd->query_id);
3611 3612 3613
		mem_analyze_corruption((byte *) prebuilt->trx);
		ut_error;
	}
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	/* Consistent read does not take any locks, thus there is
	nothing to unlock. */

	if (prebuilt->select_lock_type == LOCK_NONE) {
		DBUG_VOID_RETURN;
	}

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	if (srv_locks_unsafe_for_binlog) {
		row_unlock_for_mysql(prebuilt, FALSE);
	}
3625 3626 3627

	DBUG_VOID_RETURN;

3628 3629
}

3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641
/**********************************************************************
Initializes a handle to use an index. */

int
ha_innobase::index_init(
/*====================*/
			/* out: 0 or error number */
	uint 	keynr)	/* in: key (index) number */
{
	int 	error	= 0;
  	DBUG_ENTER("index_init");

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3642
	error = change_active_index(keynr);
3643 3644 3645 3646 3647

  	DBUG_RETURN(error);
}

/**********************************************************************
3648
Currently does nothing. */
3649 3650 3651 3652 3653 3654 3655

int
ha_innobase::index_end(void)
/*========================*/
{
	int 	error	= 0;
  	DBUG_ENTER("index_end");
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        active_index=MAX_KEY;
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  	DBUG_RETURN(error);
}

/*************************************************************************
Converts a search mode flag understood by MySQL to a flag understood
3662
by InnoDB. */
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inline
ulint
convert_search_mode_to_innobase(
/*============================*/
	enum ha_rkey_function	find_flag)
{
	switch (find_flag) {
  		case HA_READ_KEY_EXACT:		return(PAGE_CUR_GE);
  			/* the above does not require the index to be UNIQUE */
  		case HA_READ_KEY_OR_NEXT:	return(PAGE_CUR_GE);
		case HA_READ_KEY_OR_PREV:	return(PAGE_CUR_LE);
		case HA_READ_AFTER_KEY:		return(PAGE_CUR_G);
		case HA_READ_BEFORE_KEY:	return(PAGE_CUR_L);
		case HA_READ_PREFIX:		return(PAGE_CUR_GE);
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	        case HA_READ_PREFIX_LAST:       return(PAGE_CUR_LE);
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                case HA_READ_PREFIX_LAST_OR_PREV:return(PAGE_CUR_LE);
		  /* In MySQL-4.0 HA_READ_PREFIX and HA_READ_PREFIX_LAST always
		  pass a complete-field prefix of a key value as the search
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		  tuple. I.e., it is not allowed that the last field would
		  just contain n first bytes of the full field value.
		  MySQL uses a 'padding' trick to convert LIKE 'abc%'
		  type queries so that it can use as a search tuple
		  a complete-field-prefix of a key value. Thus, the InnoDB
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		  search mode PAGE_CUR_LE_OR_EXTENDS is never used.
		  TODO: when/if MySQL starts to use also partial-field
		  prefixes, we have to deal with stripping of spaces
		  and comparison of non-latin1 char type fields in
		  innobase_mysql_cmp() to get PAGE_CUR_LE_OR_EXTENDS to
		  work correctly. */

3693 3694 3695 3696 3697
		default:			assert(0);
	}

	return(0);
}
3698

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/*
   BACKGROUND INFO: HOW A SELECT SQL QUERY IS EXECUTED
   ---------------------------------------------------
The following does not cover all the details, but explains how we determine
the start of a new SQL statement, and what is associated with it.

For each table in the database the MySQL interpreter may have several
table handle instances in use, also in a single SQL query. For each table
handle instance there is an InnoDB  'prebuilt' struct which contains most
of the InnoDB data associated with this table handle instance.

  A) if the user has not explicitly set any MySQL table level locks:

  1) MySQL calls ::external_lock to set an 'intention' table level lock on
the table of the handle instance. There we set
prebuilt->sql_stat_start = TRUE. The flag sql_stat_start should be set
true if we are taking this table handle instance to use in a new SQL
statement issued by the user. We also increment trx->n_mysql_tables_in_use.

  2) If prebuilt->sql_stat_start == TRUE we 'pre-compile' the MySQL search
instructions to prebuilt->template of the table handle instance in
::index_read. The template is used to save CPU time in large joins.

  3) In row_search_for_mysql, if prebuilt->sql_stat_start is true, we
allocate a new consistent read view for the trx if it does not yet have one,
or in the case of a locking read, set an InnoDB 'intention' table level
lock on the table.

  4) We do the SELECT. MySQL may repeatedly call ::index_read for the
same table handle instance, if it is a join.

  5) When the SELECT ends, MySQL removes its intention table level locks
in ::external_lock. When trx->n_mysql_tables_in_use drops to zero,
 (a) we execute a COMMIT there if the autocommit is on,
 (b) we also release possible 'SQL statement level resources' InnoDB may
have for this SQL statement. The MySQL interpreter does NOT execute
autocommit for pure read transactions, though it should. That is why the
table handler in that case has to execute the COMMIT in ::external_lock.

  B) If the user has explicitly set MySQL table level locks, then MySQL
does NOT call ::external_lock at the start of the statement. To determine
when we are at the start of a new SQL statement we at the start of
::index_read also compare the query id to the latest query id where the
table handle instance was used. If it has changed, we know we are at the
start of a new SQL statement. Since the query id can theoretically
overwrap, we use this test only as a secondary way of determining the
start of a new SQL statement. */


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/**************************************************************************
Positions an index cursor to the index specified in the handle. Fetches the
row if any. */

int
ha_innobase::index_read(
/*====================*/
					/* out: 0, HA_ERR_KEY_NOT_FOUND,
					or error number */
3757
	mysql_byte*		buf,	/* in/out: buffer for the returned
3758
					row */
3759
	const mysql_byte* 	key_ptr,/* in: key value; if this is NULL
3760
					we position the cursor at the
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					start or end of index; this can
					also contain an InnoDB row id, in
					which case key_len is the InnoDB
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					row id length; the key value can
					also be a prefix of a full key value,
					and the last column can be a prefix
					of a full column */
3768
	uint			key_len,/* in: key value length */
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	enum ha_rkey_function find_flag)/* in: search flags from my_base.h */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	ulint		mode;
	dict_index_t*	index;
	ulint		match_mode 	= 0;
	int 		error;
	ulint		ret;

  	DBUG_ENTER("index_read");
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	ut_ad(prebuilt->trx ==
3781
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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  	statistic_increment(current_thd->status_var.ha_read_key_count,
			    &LOCK_status);
3785

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	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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		innobase_release_stat_resources(prebuilt->trx);
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	}

3793
	index = prebuilt->index;
3794

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	/* Note that if the index for which the search template is built is not
        necessarily prebuilt->index, but can also be the clustered index */
3797

3798 3799 3800 3801
	if (prebuilt->sql_stat_start) {
		build_template(prebuilt, user_thd, table,
							ROW_MYSQL_REC_FIELDS);
	}
3802 3803

	if (key_ptr) {
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	        /* Convert the search key value to InnoDB format into
		prebuilt->search_tuple */

3807
		row_sel_convert_mysql_key_to_innobase(prebuilt->search_tuple,
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					(byte*) key_val_buff,
					(ulint)upd_and_key_val_buff_len,
					index,
					(byte*) key_ptr,
3812
					(ulint) key_len, prebuilt->trx);
3813 3814 3815 3816 3817 3818
	} else {
		/* We position the cursor to the last or the first entry
		in the index */

 		dtuple_set_n_fields(prebuilt->search_tuple, 0);
	}
3819

3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831
	mode = convert_search_mode_to_innobase(find_flag);

	match_mode = 0;

	if (find_flag == HA_READ_KEY_EXACT) {
		match_mode = ROW_SEL_EXACT;

	} else if (find_flag == HA_READ_PREFIX
				|| find_flag == HA_READ_PREFIX_LAST) {
		match_mode = ROW_SEL_EXACT_PREFIX;
	}

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	last_match_mode = (uint) match_mode;
3833

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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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3835

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	ret = row_search_for_mysql((byte*) buf, mode, prebuilt, match_mode, 0);
3837

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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851
	if (ret == DB_SUCCESS) {
		error = 0;
		table->status = 0;

	} else if (ret == DB_RECORD_NOT_FOUND) {
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;

	} else if (ret == DB_END_OF_INDEX) {
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;
	} else {
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		error = convert_error_code_to_mysql((int) ret, user_thd);
3853 3854
		table->status = STATUS_NOT_FOUND;
	}
3855

3856 3857 3858
	DBUG_RETURN(error);
}

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/***********************************************************************
The following functions works like index_read, but it find the last
row with the current key value or prefix. */
3862 3863

int
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3864 3865 3866 3867 3868 3869 3870 3871 3872
ha_innobase::index_read_last(
/*=========================*/
			           /* out: 0, HA_ERR_KEY_NOT_FOUND, or an
				   error code */
        mysql_byte*       buf,     /* out: fetched row */
        const mysql_byte* key_ptr, /* in: key value, or a prefix of a full
				   key value */
	uint              key_len) /* in: length of the key val or prefix
				   in bytes */
3873
{
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        return(index_read(buf, key_ptr, key_len, HA_READ_PREFIX_LAST));
3875 3876
}

3877
/************************************************************************
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Changes the active index of a handle. */
3879 3880 3881 3882

int
ha_innobase::change_active_index(
/*=============================*/
3883 3884 3885
			/* out: 0 or error code */
	uint 	keynr)	/* in: use this index; MAX_KEY means always clustered
			index, even if it was internally generated by
3886
			InnoDB */
3887
{
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	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key=0;
3890 3891
	statistic_increment(current_thd->status_var.ha_read_key_count,
			    &LOCK_status);
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	DBUG_ENTER("change_active_index");
3893

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	ut_ad(user_thd == current_thd);
	ut_ad(prebuilt->trx ==
3896
             (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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	active_index = keynr;
3899

3900
	if (keynr != MAX_KEY && table->s->keys > 0) {
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		key = table->key_info + active_index;
3902

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		prebuilt->index = dict_table_get_index_noninline(
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						     prebuilt->table,
						     key->name);
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        } else {
		prebuilt->index = dict_table_get_first_index_noninline(
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							   prebuilt->table);
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	}
3910

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	if (!prebuilt->index) {
3912 3913 3914 3915
	       sql_print_error("Innodb could not find key n:o %u with name %s "
			       "from dict cache for table %s",
			       keynr, key ? key->name : "NULL",
			       prebuilt->table->name);
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	      DBUG_RETURN(1);
	}
3918

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3919
	assert(prebuilt->search_tuple != 0);
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3920

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	dtuple_set_n_fields(prebuilt->search_tuple, prebuilt->index->n_fields);
3922

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	dict_index_copy_types(prebuilt->search_tuple, prebuilt->index,
3924
			prebuilt->index->n_fields);
3925

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3926 3927 3928 3929 3930
	/* MySQL changes the active index for a handle also during some
	queries, for example SELECT MAX(a), SUM(a) first retrieves the MAX()
	and then calculates the sum. Previously we played safe and used
	the flag ROW_MYSQL_WHOLE_ROW below, but that caused unnecessary
	copying. Starting from MySQL-4.1 we use a more efficient flag here. */
3931

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	build_template(prebuilt, user_thd, table, ROW_MYSQL_REC_FIELDS);
3933

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	DBUG_RETURN(0);
3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945
}

/**************************************************************************
Positions an index cursor to the index specified in keynr. Fetches the
row if any. */
/* ??? This is only used to read whole keys ??? */

int
ha_innobase::index_read_idx(
/*========================*/
					/* out: error number or 0 */
3946
	mysql_byte*	buf,		/* in/out: buffer for the returned
3947 3948
					row */
	uint 		keynr,		/* in: use this index */
3949
	const mysql_byte* key,		/* in: key value; if this is NULL
3950 3951 3952 3953 3954
					we position the cursor at the
					start or end of index */
	uint		key_len,	/* in: key value length */
	enum ha_rkey_function find_flag)/* in: search flags from my_base.h */
{
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3955 3956 3957 3958
	if (change_active_index(keynr)) {

		return(1);
	}
3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971

	return(index_read(buf, key, key_len, find_flag));
}

/***************************************************************************
Reads the next or previous row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::general_fetch(
/*=======================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
3972
	mysql_byte* 	buf,	/* in/out: buffer for next row in MySQL
3973 3974 3975 3976 3977 3978 3979 3980
				format */
	uint 	direction,	/* in: ROW_SEL_NEXT or ROW_SEL_PREV */
	uint	match_mode)	/* in: 0, ROW_SEL_EXACT, or
				ROW_SEL_EXACT_PREFIX */
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	ulint		ret;
	int		error	= 0;
3981

3982
	DBUG_ENTER("general_fetch");
3983

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3984
	ut_ad(prebuilt->trx ==
3985
             (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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3986

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3987
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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3988

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3989 3990
	ret = row_search_for_mysql((byte*)buf, 0, prebuilt, match_mode,
								direction);
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	innodb_srv_conc_exit_innodb(prebuilt->trx);
3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004

	if (ret == DB_SUCCESS) {
		error = 0;
		table->status = 0;

	} else if (ret == DB_RECORD_NOT_FOUND) {
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;

	} else if (ret == DB_END_OF_INDEX) {
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;
	} else {
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		error = convert_error_code_to_mysql((int) ret, user_thd);
4006 4007
		table->status = STATUS_NOT_FOUND;
	}
4008

4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020
	DBUG_RETURN(error);
}

/***************************************************************************
Reads the next row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::index_next(
/*====================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
4021
	mysql_byte* 	buf)	/* in/out: buffer for next row in MySQL
4022 4023
				format */
{
4024 4025
  	statistic_increment(current_thd->status_var.ha_read_next_count,
			    &LOCK_status);
4026

4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037
	return(general_fetch(buf, ROW_SEL_NEXT, 0));
}

/***********************************************************************
Reads the next row matching to the key value given as the parameter. */

int
ha_innobase::index_next_same(
/*=========================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
4038 4039
	mysql_byte* 	buf,	/* in/out: buffer for the row */
	const mysql_byte* key,	/* in: key value */
4040 4041
	uint 		keylen)	/* in: key value length */
{
4042 4043
  	statistic_increment(current_thd->status_var.ha_read_next_count,
			    &LOCK_status);
4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056

	return(general_fetch(buf, ROW_SEL_NEXT, last_match_mode));
}

/***************************************************************************
Reads the previous row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::index_prev(
/*====================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
4057
	mysql_byte* 	buf)	/* in/out: buffer for previous row in MySQL
4058 4059
				format */
{
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  	statistic_increment(current_thd->status_var.ha_read_prev_count,
			    &LOCK_status);

4063 4064 4065 4066 4067 4068 4069 4070 4071 4072
	return(general_fetch(buf, ROW_SEL_PREV, 0));
}

/************************************************************************
Positions a cursor on the first record in an index and reads the
corresponding row to buf. */

int
ha_innobase::index_first(
/*=====================*/
4073
				/* out: 0, HA_ERR_END_OF_FILE,
4074 4075
				or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
4076 4077 4078 4079
{
	int	error;

  	DBUG_ENTER("index_first");
4080 4081
  	statistic_increment(current_thd->status_var.ha_read_first_count,
			    &LOCK_status);
4082 4083 4084

  	error = index_read(buf, NULL, 0, HA_READ_AFTER_KEY);

4085 4086 4087 4088 4089 4090
        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */

  	if (error == HA_ERR_KEY_NOT_FOUND) {
  		error = HA_ERR_END_OF_FILE;
  	}

4091 4092 4093 4094 4095 4096 4097 4098 4099 4100
  	DBUG_RETURN(error);
}

/************************************************************************
Positions a cursor on the last record in an index and reads the
corresponding row to buf. */

int
ha_innobase::index_last(
/*====================*/
4101 4102
				/* out: 0, HA_ERR_END_OF_FILE, or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
4103 4104 4105
{
	int	error;

4106
  	DBUG_ENTER("index_last");
4107 4108
  	statistic_increment(current_thd->status_var.ha_read_last_count,
			    &LOCK_status);
4109 4110 4111

  	error = index_read(buf, NULL, 0, HA_READ_BEFORE_KEY);

4112
        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */
4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127

  	if (error == HA_ERR_KEY_NOT_FOUND) {
  		error = HA_ERR_END_OF_FILE;
  	}

  	DBUG_RETURN(error);
}

/********************************************************************
Initialize a table scan. */

int
ha_innobase::rnd_init(
/*==================*/
			/* out: 0 or error number */
4128
	bool	scan)	/* in: ???????? */
4129
{
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4130
	int	err;
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4132
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
4133

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	/* Store the active index value so that we can restore the original
	value after a scan */

4137
	if (prebuilt->clust_index_was_generated) {
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4138
		err = change_active_index(MAX_KEY);
4139
	} else {
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4140
		err = change_active_index(primary_key);
4141
	}
4142

4143
  	start_of_scan = 1;
4144

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4145
 	return(err);
4146 4147 4148
}

/*********************************************************************
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4149
Ends a table scan. */
4150 4151 4152 4153 4154 4155

int
ha_innobase::rnd_end(void)
/*======================*/
				/* out: 0 or error number */
{
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	return(index_end());
4157 4158 4159 4160 4161 4162 4163 4164 4165 4166
}

/*********************************************************************
Reads the next row in a table scan (also used to read the FIRST row
in a table scan). */

int
ha_innobase::rnd_next(
/*==================*/
			/* out: 0, HA_ERR_END_OF_FILE, or error number */
4167
	mysql_byte* buf)/* in/out: returns the row in this buffer,
4168 4169
			in MySQL format */
{
4170
	int	error;
4171 4172

  	DBUG_ENTER("rnd_next");
4173 4174
  	statistic_increment(current_thd->status_var.ha_read_rnd_next_count,
			    &LOCK_status);
4175

4176
  	if (start_of_scan) {
4177 4178 4179 4180
		error = index_first(buf);
		if (error == HA_ERR_KEY_NOT_FOUND) {
			error = HA_ERR_END_OF_FILE;
		}
4181
		start_of_scan = 0;
4182
	} else {
4183
		error = general_fetch(buf, ROW_SEL_NEXT, 0);
4184
	}
4185

4186 4187 4188 4189
  	DBUG_RETURN(error);
}

/**************************************************************************
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4190
Fetches a row from the table based on a row reference. */
4191

4192 4193 4194
int
ha_innobase::rnd_pos(
/*=================*/
4195 4196 4197
				/* out: 0, HA_ERR_KEY_NOT_FOUND,
				or error code */
	mysql_byte* 	buf,	/* in/out: buffer for the row */
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4198 4199 4200 4201 4202
	mysql_byte*	pos)	/* in: primary key value of the row in the
				MySQL format, or the row id if the clustered
				index was internally generated by InnoDB;
				the length of data in pos has to be
				ref_length */
4203
{
4204 4205 4206
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error;
	uint		keynr	= active_index;
4207
	DBUG_ENTER("rnd_pos");
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4208
	DBUG_DUMP("key", (char*) pos, ref_length);
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4209

4210 4211
	statistic_increment(current_thd->status_var.ha_read_rnd_count,
			    &LOCK_status);
4212

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4213
	ut_ad(prebuilt->trx ==
4214
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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4215

4216 4217 4218 4219
	if (prebuilt->clust_index_was_generated) {
		/* No primary key was defined for the table and we
		generated the clustered index from the row id: the
		row reference is the row id, not any key value
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		that MySQL knows of */
4221

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4222
		error = change_active_index(MAX_KEY);
4223
	} else {
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4224
		error = change_active_index(primary_key);
4225
	}
4226

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4227
	if (error) {
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4228
	        DBUG_PRINT("error", ("Got error: %d", error));
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4229 4230
		DBUG_RETURN(error);
	}
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	/* Note that we assume the length of the row reference is fixed
        for the table, and it is == ref_length */

	error = index_read(buf, pos, ref_length, HA_READ_KEY_EXACT);
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4236 4237

	if (error) {
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4238
		DBUG_PRINT("error", ("Got error: %d", error));
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4239
	}
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4240

4241
	change_active_index(keynr);
4242

4243 4244 4245 4246
  	DBUG_RETURN(error);
}

/*************************************************************************
4247
Stores a reference to the current row to 'ref' field of the handle. Note
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4248 4249
that in the case where we have generated the clustered index for the
table, the function parameter is illogical: we MUST ASSUME that 'record'
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4250
is the current 'position' of the handle, because if row ref is actually
4251
the row id internally generated in InnoDB, then 'record' does not contain
4252 4253
it. We just guess that the row id must be for the record where the handle
was positioned the last time. */
4254 4255 4256 4257

void
ha_innobase::position(
/*==================*/
4258
	const mysql_byte*	record)	/* in: row in MySQL format */
4259
{
4260 4261
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	uint		len;
4262

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4263
	ut_ad(prebuilt->trx ==
4264
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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4265

4266 4267 4268 4269
	if (prebuilt->clust_index_was_generated) {
		/* No primary key was defined for the table and we
		generated the clustered index from row id: the
		row reference will be the row id, not any key value
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4270
		that MySQL knows of */
4271 4272 4273 4274 4275

		len = DATA_ROW_ID_LEN;

		memcpy(ref, prebuilt->row_id, len);
	} else {
4276 4277
		len = store_key_val_for_row(primary_key, (char*)ref,
							 ref_length, record);
4278
	}
4279

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4280 4281
	/* We assume that the 'ref' value len is always fixed for the same
	table. */
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4282

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4283
	if (len != ref_length) {
4284
	  sql_print_error("Stored ref len is %lu, but table ref len is %lu",
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4285
			  (ulong) len, (ulong) ref_length);
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4286
	}
4287 4288 4289
}

/*********************************************************************
4290
Creates a table definition to an InnoDB database. */
4291 4292 4293 4294
static
int
create_table_def(
/*=============*/
4295
	trx_t*		trx,		/* in: InnoDB transaction handle */
4296 4297
	TABLE*		form,		/* in: information on table
					columns and indexes */
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4298
	const char*	table_name,	/* in: table name */
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4299
	const char*	path_of_temp_table,/* in: if this is a table explicitly
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4300 4301 4302 4303 4304 4305 4306
					created by the user with the
					TEMPORARY keyword, then this
					parameter is the dir path where the
					table should be placed if we create
					an .ibd file for it (no .ibd extension
					in the path, though); otherwise this
					is NULL */
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	ibool		comp)		/* in: TRUE=compact record format */
4308 4309 4310 4311 4312 4313
{
	Field*		field;
	dict_table_t*	table;
	ulint		n_cols;
  	int 		error;
  	ulint		col_type;
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	ulint		col_len;
4315 4316
  	ulint		nulls_allowed;
	ulint		unsigned_type;
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	ulint		binary_type;
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	ulint		long_true_varchar;
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4319
	ulint		charset_no;
4320
  	ulint		i;
4321

4322 4323 4324
  	DBUG_ENTER("create_table_def");
  	DBUG_PRINT("enter", ("table_name: %s", table_name));

4325
	n_cols = form->s->fields;
4326

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4327 4328
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
4329

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4330
	table = dict_mem_table_create(table_name, 0, n_cols, comp);
4331

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4332 4333 4334 4335 4336
	if (path_of_temp_table) {
		table->dir_path_of_temp_table =
			mem_heap_strdup(table->heap, path_of_temp_table);
	}

4337 4338 4339
	for (i = 0; i < n_cols; i++) {
		field = form->field[i];

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4340 4341
		col_type = get_innobase_type_from_mysql_type(&unsigned_type,
									field);
4342 4343 4344 4345 4346 4347
		if (field->null_ptr) {
			nulls_allowed = 0;
		} else {
			nulls_allowed = DATA_NOT_NULL;
		}

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		if (field->binary()) {
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			binary_type = DATA_BINARY_TYPE;
		} else {
			binary_type = 0;
		}

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		charset_no = 0;
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		if (dtype_is_string_type(col_type)) {

			charset_no = (ulint)field->charset()->number;

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			ut_a(charset_no < 256); /* in data0type.h we assume
						that the number fits in one
						byte */
		}

		ut_a(field->type() < 256); /* we assume in dtype_form_prtype()
					   that this fits in one byte */
		col_len = field->pack_length();

		/* The MySQL pack length contains 1 or 2 bytes length field
		for a true VARCHAR. Let us subtract that, so that the InnoDB
		column length in the InnoDB data dictionary is the real
		maximum byte length of the actual data. */
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4373

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		long_true_varchar = 0;

		if (field->type() == MYSQL_TYPE_VARCHAR) {
			col_len -= ((Field_varstring*)field)->length_bytes;

			if (((Field_varstring*)field)->length_bytes == 2) {
				long_true_varchar = DATA_LONG_TRUE_VARCHAR;
			}
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		}

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		dict_mem_table_add_col(table,
					(char*) field->field_name,
					col_type,
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4387
					dtype_form_prtype(
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					    (ulint)field->type()
					     | nulls_allowed | unsigned_type
					     | binary_type | long_true_varchar,
					    charset_no),
					col_len,
					0);
4394 4395 4396 4397
	}

	error = row_create_table_for_mysql(table, trx);

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	error = convert_error_code_to_mysql(error, NULL);
4399 4400 4401 4402 4403

	DBUG_RETURN(error);
}

/*********************************************************************
4404
Creates an index in an InnoDB database. */
4405 4406
static
int
4407 4408
create_index(
/*=========*/
4409
	trx_t*		trx,		/* in: InnoDB transaction handle */
4410 4411 4412 4413 4414
	TABLE*		form,		/* in: information on table
					columns and indexes */
	const char*	table_name,	/* in: table name */
	uint		key_num)	/* in: index number */
{
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	Field*		field;
4416
	dict_index_t*	index;
4417
  	int 		error;
4418 4419 4420 4421
	ulint		n_fields;
	KEY*		key;
	KEY_PART_INFO*	key_part;
	ulint		ind_type;
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	ulint		col_type;
	ulint		prefix_len;
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	ulint		is_unsigned;
4425
  	ulint		i;
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  	ulint		j;
4427
	ulint*		field_lengths;
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4428

4429
  	DBUG_ENTER("create_index");
4430

4431 4432 4433
	key = form->key_info + key_num;

    	n_fields = key->key_parts;
4434

4435 4436
    	ind_type = 0;

4437
    	if (key_num == form->s->primary_key) {
4438 4439
		ind_type = ind_type | DICT_CLUSTERED;
	}
4440

4441 4442 4443 4444
	if (key->flags & HA_NOSAME ) {
		ind_type = ind_type | DICT_UNIQUE;
	}

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	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
4447 4448 4449

	index = dict_mem_index_create((char*) table_name, key->name, 0,
						ind_type, n_fields);
4450 4451 4452

	field_lengths = (ulint*) my_malloc(sizeof(ulint) * n_fields,
		MYF(MY_FAE));
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4453

4454 4455 4456
	for (i = 0; i < n_fields; i++) {
		key_part = key->key_part + i;

4457
		/* (The flag HA_PART_KEY_SEG denotes in MySQL a column prefix
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4458 4459 4460 4461
		field in an index: we only store a specified number of first
		bytes of the column to the index field.) The flag does not
		seem to be properly set by MySQL. Let us fall back on testing
		the length of the key part versus the column. */
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4462

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		field = NULL;
4464
		for (j = 0; j < form->s->fields; j++) {
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4465 4466 4467

			field = form->field[j];

4468 4469 4470
			if (0 == innobase_strcasecmp(
					field->field_name,
					key_part->field->field_name)) {
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				/* Found the corresponding column */

				break;
			}
		}

4477
		ut_a(j < form->s->fields);
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4478

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		col_type = get_innobase_type_from_mysql_type(
					&is_unsigned, key_part->field);
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		if (DATA_BLOB == col_type
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		    || (key_part->length < field->pack_length()
			&& field->type() != MYSQL_TYPE_VARCHAR)
		    || (field->type() == MYSQL_TYPE_VARCHAR
			&& key_part->length < field->pack_length()
			          - ((Field_varstring*)field)->length_bytes)) {
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4488

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		        prefix_len = key_part->length;

			if (col_type == DATA_INT
			    || col_type == DATA_FLOAT
			    || col_type == DATA_DOUBLE
			    || col_type == DATA_DECIMAL) {
4495 4496 4497 4498 4499 4500
			  sql_print_error("MySQL is trying to create a column "
					  "prefix index field, on an "
					  "inappropriate data type. Table "
					  "name %s, column name %s.",
					  table_name,
					  key_part->field->field_name);
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4501

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			        prefix_len = 0;
			}
		} else {
		        prefix_len = 0;
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4506 4507
		}

4508 4509
		field_lengths[i] = key_part->length;

4510 4511
		/* We assume all fields should be sorted in ascending
		order, hence the '0': */
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4512

4513
		dict_mem_index_add_field(index,
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4514 4515
				(char*) key_part->field->field_name,
				0, prefix_len);
4516 4517
	}

4518 4519 4520
	/* Even though we've defined max_supported_key_part_length, we
	still do our own checking using field_lengths to be absolutely
	sure we don't create too long indexes. */
4521
	error = row_create_index_for_mysql(index, trx, field_lengths);
4522

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4523
	error = convert_error_code_to_mysql(error, NULL);
4524

4525
	my_free((gptr) field_lengths, MYF(0));
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4526

4527 4528 4529 4530
	DBUG_RETURN(error);
}

/*********************************************************************
4531
Creates an index to an InnoDB table when the user has defined no
4532
primary index. */
4533 4534
static
int
4535 4536
create_clustered_index_when_no_primary(
/*===================================*/
4537
	trx_t*		trx,		/* in: InnoDB transaction handle */
4538 4539 4540
	const char*	table_name)	/* in: table name */
{
	dict_index_t*	index;
4541 4542
  	int 		error;

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4543 4544
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
4545

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4546 4547 4548
	index = dict_mem_index_create((char*) table_name,
				      (char*) "GEN_CLUST_INDEX",
				      0, DICT_CLUSTERED, 0);
4549
	error = row_create_index_for_mysql(index, trx, NULL);
4550

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4551
	error = convert_error_code_to_mysql(error, NULL);
4552

4553
	return(error);
4554 4555
}

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4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569
/*********************************************************************
Update create_info.  Used in SHOW CREATE TABLE et al. */

void
ha_innobase::update_create_info(
/*============================*/
	HA_CREATE_INFO* create_info)	/* in/out: create info */
{
  if (!(create_info->used_fields & HA_CREATE_USED_AUTO)) {
    ha_innobase::info(HA_STATUS_AUTO);
    create_info->auto_increment_value = auto_increment_value;
  }
}

4570
/*********************************************************************
4571
Creates a new table to an InnoDB database. */
4572 4573 4574 4575 4576 4577 4578 4579

int
ha_innobase::create(
/*================*/
					/* out: error number */
	const char*	name,		/* in: table name */
	TABLE*		form,		/* in: information on table
					columns and indexes */
4580 4581 4582
	HA_CREATE_INFO*	create_info)	/* in: more information of the
					created table, contains also the
					create statement string */
4583 4584 4585
{
	int		error;
	dict_table_t*	innobase_table;
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4586
	trx_t*		parent_trx;
4587
	trx_t*		trx;
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4588
	int		primary_key_no;
4589
	uint		i;
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4590 4591
	char		name2[FN_REFLEN];
	char		norm_name[FN_REFLEN];
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4592
	THD		*thd= current_thd;
4593
	ib_longlong     auto_inc_value;
4594

4595 4596
  	DBUG_ENTER("ha_innobase::create");

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4597
	DBUG_ASSERT(thd != NULL);
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4598

4599
	if (form->s->fields > 1000) {
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4600 4601 4602
		/* The limit probably should be REC_MAX_N_FIELDS - 3 = 1020,
		but we play safe here */

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4603
	        DBUG_RETURN(HA_ERR_TO_BIG_ROW);
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4604
	}
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4605

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4606 4607
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
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4608

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4609
	parent_trx = check_trx_exists(current_thd);
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4610 4611 4612 4613

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

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4614
	trx_search_latch_release_if_reserved(parent_trx);
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4615

4616
	trx = trx_allocate_for_mysql();
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4617

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4618 4619
	trx->mysql_thd = thd;
	trx->mysql_query_str = &((*thd).query);
4620

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4621
	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
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4622 4623 4624
		trx->check_foreigns = FALSE;
	}

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4625
	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
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4626 4627 4628
		trx->check_unique_secondary = FALSE;
	}

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4629 4630 4631 4632 4633
	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}
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4634

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4635
	fn_format(name2, name, "", "", 2);	// Remove the .frm extension
4636 4637

	normalize_table_name(norm_name, name2);
4638

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4639
	/* Latch the InnoDB data dictionary exclusively so that no deadlocks
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4640
	or lock waits can happen in it during a table create operation.
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4641
	Drop table etc. do this latching in row0mysql.c. */
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4642

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4643
	row_mysql_lock_data_dictionary(trx);
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4644 4645

	/* Create the table definition in InnoDB */
4646

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4647 4648
	error = create_table_def(trx, form, norm_name,
		create_info->options & HA_LEX_CREATE_TMP_TABLE ? name2 : NULL,
4649
		form->s->row_type != ROW_TYPE_REDUNDANT);
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4650

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4651
  	if (error) {
4652
		goto cleanup;
4653 4654
 	}

4655 4656
	/* Look for a primary key */

4657
	primary_key_no= (table->s->primary_key != MAX_KEY ?
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4658
			 (int) table->s->primary_key :
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4659
			 -1);
4660

4661 4662 4663
	/* Our function row_get_mysql_key_number_for_index assumes
	the primary key is always number 0, if it exists */

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4664
	DBUG_ASSERT(primary_key_no == -1 || primary_key_no == 0);
4665

4666 4667
	/* Create the keys */

4668
	if (form->s->keys == 0 || primary_key_no == -1) {
4669 4670
		/* Create an index which is used as the clustered index;
		order the rows by their row id which is internally generated
4671
		by InnoDB */
4672

4673
		error = create_clustered_index_when_no_primary(trx,
4674
							norm_name);
4675
  		if (error) {
4676
			goto cleanup;
4677
      		}
4678 4679 4680
	}

	if (primary_key_no != -1) {
4681
		/* In InnoDB the clustered index must always be created
4682
		first */
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4683 4684
	    	if ((error = create_index(trx, form, norm_name,
					  (uint) primary_key_no))) {
4685
			goto cleanup;
4686 4687 4688
      		}
      	}

4689
	for (i = 0; i < form->s->keys; i++) {
4690 4691 4692

		if (i != (uint) primary_key_no) {

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4693
    			if ((error = create_index(trx, form, norm_name, i))) {
4694
				goto cleanup;
4695
      			}
4696
      		}
4697
  	}
4698

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4699
	if (current_thd->query != NULL) {
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4700
		LEX_STRING q;
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4701

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4702 4703 4704 4705 4706
		if (thd->convert_string(&q, system_charset_info,
					current_thd->query,
					current_thd->query_length,
					current_thd->charset())) {
			error = HA_ERR_OUT_OF_MEM;
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4707

4708
			goto cleanup;
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4709
		}
4710

4711 4712 4713
		error = row_table_add_foreign_constraints(trx,
			q.str, norm_name,
			create_info->options & HA_LEX_CREATE_TMP_TABLE);
4714

4715
		error = convert_error_code_to_mysql(error, NULL);
4716

4717 4718
		if (error) {
			goto cleanup;
4719
		}
4720 4721
	}

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4722 4723
  	innobase_commit_low(trx);

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4724
	row_mysql_unlock_data_dictionary(trx);
4725

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Merge  
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4726 4727 4728
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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4729

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4730
	log_buffer_flush_to_disk();
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4731

4732
	innobase_table = dict_table_get(norm_name, NULL);
4733

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4734
	DBUG_ASSERT(innobase_table != 0);
4735

4736 4737
	if ((create_info->used_fields & HA_CREATE_USED_AUTO) &&
	   (create_info->auto_increment_value != 0)) {
4738

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4739
		/* Query was ALTER TABLE...AUTO_INCREMENT = x; or
4740
		CREATE TABLE ...AUTO_INCREMENT = x; Find out a table
4741 4742
		definition from the dictionary and get the current value
		of the auto increment field. Set a new value to the
4743 4744
		auto increment field if the value is greater than the
		maximum value in the column. */
4745

4746
		auto_inc_value = create_info->auto_increment_value;
4747 4748 4749
		dict_table_autoinc_initialize(innobase_table, auto_inc_value);
	}

4750
	/* Tell the InnoDB server that there might be work for
4751 4752 4753 4754 4755 4756 4757
	utility threads: */

	srv_active_wake_master_thread();

  	trx_free_for_mysql(trx);

	DBUG_RETURN(0);
4758 4759 4760

cleanup:
	innobase_commit_low(trx);
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4761

4762
	row_mysql_unlock_data_dictionary(trx);
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4763

4764 4765 4766
	trx_free_for_mysql(trx);

	DBUG_RETURN(error);
4767 4768
}

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/*********************************************************************
Discards or imports an InnoDB tablespace. */

int
ha_innobase::discard_or_import_tablespace(
/*======================================*/
				/* out: 0 == success, -1 == error */
	my_bool discard)	/* in: TRUE if discard, else import */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
4779
	dict_table_t*	dict_table;
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4780 4781 4782 4783 4784 4785 4786
	trx_t*		trx;
	int		err;

 	DBUG_ENTER("ha_innobase::discard_or_import_tablespace");

	ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);
	ut_a(prebuilt->trx ==
4787
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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4788

4789
	dict_table = prebuilt->table;
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	trx = prebuilt->trx;

	if (discard) {
4793
		err = row_discard_tablespace_for_mysql(dict_table->name, trx);
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4794
	} else {
4795
		err = row_import_tablespace_for_mysql(dict_table->name, trx);
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4796 4797
	}

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4798
	err = convert_error_code_to_mysql(err, NULL);
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4799

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4800
	DBUG_RETURN(err);
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4801 4802
}

4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842
/*********************************************************************
Deletes all rows of an InnoDB table. */

int
ha_innobase::delete_all_rows(void)
/*==============================*/
				/* out: error number */
{
	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
	int		error;
	trx_t*		trx;
	THD*		thd		= current_thd;

	DBUG_ENTER("ha_innobase::delete_all_rows");

	if (thd->lex->sql_command != SQLCOM_TRUNCATE) {
	fallback:
		/* We only handle TRUNCATE TABLE t as a special case.
		DELETE FROM t will have to use ha_innobase::delete_row(). */
		DBUG_RETURN(my_errno=HA_ERR_WRONG_COMMAND);
	}

	/* Get the transaction associated with the current thd, or create one
	if not yet created */

	trx = check_trx_exists(thd);

	/* Truncate the table in InnoDB */

	error = row_truncate_table_for_mysql(prebuilt->table, trx);
	if (error == DB_ERROR) {
		/* Cannot truncate; resort to ha_innobase::delete_row() */
		goto fallback;
	}

	error = convert_error_code_to_mysql(error, NULL);

	DBUG_RETURN(error);
}

4843
/*********************************************************************
4844
Drops a table from an InnoDB database. Before calling this function,
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4845 4846
MySQL calls innobase_commit to commit the transaction of the current user.
Then the current user cannot have locks set on the table. Drop table
4847 4848
operation inside InnoDB will remove all locks any user has on the table
inside InnoDB. */
4849 4850 4851 4852

int
ha_innobase::delete_table(
/*======================*/
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4853 4854
				/* out: error number */
	const char*	name)	/* in: table name */
4855 4856 4857
{
	ulint	name_len;
	int	error;
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4858
	trx_t*	parent_trx;
4859
	trx_t*	trx;
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4860
	THD     *thd= current_thd;
4861
	char	norm_name[1000];
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4862

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4863
 	DBUG_ENTER("ha_innobase::delete_table");
4864

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4865 4866
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
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4867

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4868
	parent_trx = check_trx_exists(current_thd);
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4869 4870 4871 4872

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

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4873
	trx_search_latch_release_if_reserved(parent_trx);
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4874

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	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

4881 4882
	trx = trx_allocate_for_mysql();

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	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
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	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
		trx->check_unique_secondary = FALSE;
	}

4894 4895 4896
	name_len = strlen(name);

	assert(name_len < 1000);
4897

4898 4899
	/* Strangely, MySQL passes the table name without the '.frm'
	extension, in contrast to ::create */
4900

4901 4902
	normalize_table_name(norm_name, name);

4903
  	/* Drop the table in InnoDB */
4904

4905
	error = row_drop_table_for_mysql(norm_name, trx,
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		thd->lex->sql_command == SQLCOM_DROP_DB);
4907

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	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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	log_buffer_flush_to_disk();
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4914
	/* Tell the InnoDB server that there might be work for
4915 4916 4917 4918
	utility threads: */

	srv_active_wake_master_thread();

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  	innobase_commit_low(trx);
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4921 4922
  	trx_free_for_mysql(trx);

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	error = convert_error_code_to_mysql(error, NULL);
4924 4925 4926 4927

	DBUG_RETURN(error);
}

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/*********************************************************************
Removes all tables in the named database inside InnoDB. */

int
innobase_drop_database(
/*===================*/
			/* out: error number */
	char*	path)	/* in: database path; inside InnoDB the name
			of the last directory in the path is used as
			the database name: for example, in 'mysql/data/test'
			the database name is 'test' */
{
	ulint	len		= 0;
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	trx_t*	parent_trx;
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	trx_t*	trx;
	char*	ptr;
	int	error;
4945
	char*	namebuf;
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	/* Get the transaction associated with the current thd, or create one
	if not yet created */
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	parent_trx = check_trx_exists(current_thd);
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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

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	trx_search_latch_release_if_reserved(parent_trx);
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4957
	ptr = strend(path) - 2;
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	while (ptr >= path && *ptr != '\\' && *ptr != '/') {
		ptr--;
		len++;
	}

	ptr++;
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	namebuf = my_malloc((uint) len + 2, MYF(0));
4966 4967 4968 4969

	memcpy(namebuf, ptr, len);
	namebuf[len] = '/';
	namebuf[len + 1] = '\0';
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#ifdef  __WIN__
4971
	innobase_casedn_str(namebuf);
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#endif
4973
	trx = trx_allocate_for_mysql();
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	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4976

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	if (current_thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

4981
  	error = row_drop_database_for_mysql(namebuf, trx);
4982
	my_free(namebuf, MYF(0));
4983

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	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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	log_buffer_flush_to_disk();
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4989

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	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

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  	innobase_commit_low(trx);
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  	trx_free_for_mysql(trx);

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	error = convert_error_code_to_mysql(error, NULL);
4999 5000 5001 5002

	return(error);
}

5003
/*************************************************************************
5004
Renames an InnoDB table. */
5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015

int
ha_innobase::rename_table(
/*======================*/
				/* out: 0 or error code */
	const char*	from,	/* in: old name of the table */
	const char*	to)	/* in: new name of the table */
{
	ulint	name_len1;
	ulint	name_len2;
	int	error;
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	trx_t*	parent_trx;
5017
	trx_t*	trx;
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	char	norm_from[1000];
	char	norm_to[1000];
5020

5021 5022
  	DBUG_ENTER("ha_innobase::rename_table");

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	/* Get the transaction associated with the current thd, or create one
	if not yet created */
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	parent_trx = check_trx_exists(current_thd);
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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

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	trx_search_latch_release_if_reserved(parent_trx);
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	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

5039
	trx = trx_allocate_for_mysql();
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	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
5042

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	if (current_thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

5047 5048 5049 5050 5051
	name_len1 = strlen(from);
	name_len2 = strlen(to);

	assert(name_len1 < 1000);
	assert(name_len2 < 1000);
5052

5053 5054 5055
	normalize_table_name(norm_from, from);
	normalize_table_name(norm_to, to);

5056
  	/* Rename the table in InnoDB */
5057

5058
  	error = row_rename_table_for_mysql(norm_from, norm_to, trx);
5059

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	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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	log_buffer_flush_to_disk();
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5066
	/* Tell the InnoDB server that there might be work for
5067 5068 5069 5070
	utility threads: */

	srv_active_wake_master_thread();

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  	innobase_commit_low(trx);
5072 5073
  	trx_free_for_mysql(trx);

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	error = convert_error_code_to_mysql(error, NULL);
5075 5076 5077 5078 5079 5080 5081 5082 5083 5084

	DBUG_RETURN(error);
}

/*************************************************************************
Estimates the number of index records in a range. */

ha_rows
ha_innobase::records_in_range(
/*==========================*/
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						/* out: estimated number of
						rows */
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	uint 			keynr,		/* in: index number */
        key_range		*min_key,	/* in: start key value of the
                                                   range, may also be 0 */
	key_range		*max_key)	/* in: range end key val, may
                                                   also be 0 */
5092 5093 5094 5095
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key;
	dict_index_t*	index;
5096
	mysql_byte*	key_val_buff2 	= (mysql_byte*) my_malloc(
5097
						  table->s->reclength
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      					+ table->s->max_key_length + 100,
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								MYF(MY_FAE));
5100
	ulint		buff2_len = table->s->reclength
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      					+ table->s->max_key_length + 100;
5102
	dtuple_t*	range_start;
5103
	dtuple_t*	range_end;
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	ib_longlong	n_rows;
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	ulint		mode1;
	ulint		mode2;
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	void*           heap1;
	void*           heap2;
5109

5110
   	DBUG_ENTER("records_in_range");
5111

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	prebuilt->trx->op_info = (char*)"estimating records in index range";

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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
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5119 5120 5121
	active_index = keynr;

	key = table->key_info + active_index;
5122

5123
	index = dict_table_get_index_noninline(prebuilt->table, key->name);
5124

5125
	range_start = dtuple_create_for_mysql(&heap1, key->key_parts);
5126
 	dict_index_copy_types(range_start, index, key->key_parts);
5127

5128
	range_end = dtuple_create_for_mysql(&heap2, key->key_parts);
5129
 	dict_index_copy_types(range_end, index, key->key_parts);
5130

5131
	row_sel_convert_mysql_key_to_innobase(
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				range_start, (byte*) key_val_buff,
				(ulint)upd_and_key_val_buff_len,
				index,
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				(byte*) (min_key ? min_key->key :
                                         (const mysql_byte*) 0),
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				(ulint) (min_key ? min_key->length : 0),
				prebuilt->trx);
5139

5140
	row_sel_convert_mysql_key_to_innobase(
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				range_end, (byte*) key_val_buff2,
				buff2_len, index,
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				(byte*) (max_key ? max_key->key :
                                         (const mysql_byte*) 0),
5145 5146
				(ulint) (max_key ? max_key->length : 0),
				prebuilt->trx);
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	mode1 = convert_search_mode_to_innobase(min_key ? min_key->flag :
                                                HA_READ_KEY_EXACT);
	mode2 = convert_search_mode_to_innobase(max_key ? max_key->flag :
                                                HA_READ_KEY_EXACT);
5152

5153
	n_rows = btr_estimate_n_rows_in_range(index, range_start,
5154
						mode1, range_end, mode2);
5155 5156
	dtuple_free_for_mysql(heap1);
	dtuple_free_for_mysql(heap2);
5157

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    	my_free((gptr) key_val_buff2, MYF(0));
5159

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	prebuilt->trx->op_info = (char*)"";

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	/* The MySQL optimizer seems to believe an estimate of 0 rows is
	always accurate and may return the result 'Empty set' based on that.
	The accuracy is not guaranteed, and even if it were, for a locking
	read we should anyway perform the search to set the next-key lock.
	Add 1 to the value to make sure MySQL does not make the assumption! */

	if (n_rows == 0) {
	        n_rows = 1;
	}

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	DBUG_RETURN((ha_rows) n_rows);
}

5175 5176
/*************************************************************************
Gives an UPPER BOUND to the number of rows in a table. This is used in
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filesort.cc. */
5178 5179

ha_rows
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ha_innobase::estimate_rows_upper_bound(void)
5181
/*======================================*/
5182
			/* out: upper bound of rows */
5183 5184
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
5185 5186
	dict_index_t*	index;
	ulonglong	estimate;
5187
	ulonglong	local_data_file_length;
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 	DBUG_ENTER("estimate_rows_upper_bound");
5190

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	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(current_thd);

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	prebuilt->trx->op_info = (char*)
	                         "calculating upper bound for table rows";

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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
5204

5205
	index = dict_table_get_first_index_noninline(prebuilt->table);
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5207
	local_data_file_length = ((ulonglong) index->stat_n_leaf_pages)
5208
    							* UNIV_PAGE_SIZE;
5209

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	/* Calculate a minimum length for a clustered index record and from
	that an upper bound for the number of rows. Since we only calculate
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	new statistics in row0mysql.c when a table has grown by a threshold
	factor, we must add a safety factor 2 in front of the formula below. */
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	estimate = 2 * local_data_file_length /
					 dict_index_calc_min_rec_len(index);
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	prebuilt->trx->op_info = (char*)"";

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	DBUG_RETURN((ha_rows) estimate);
5221 5222
}

5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234
/*************************************************************************
How many seeks it will take to read through the table. This is to be
comparable to the number returned by records_in_range so that we can
decide if we should scan the table or use keys. */

double
ha_innobase::scan_time()
/*====================*/
			/* out: estimated time measured in disk seeks */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;

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	/* Since MySQL seems to favor table scans too much over index
	searches, we pretend that a sequential read takes the same time
	as a random disk read, that is, we do not divide the following
	by 10, which would be physically realistic. */
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	return((double) (prebuilt->table->stat_clustered_index_size));
5241 5242
}

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/**********************************************************************
Calculate the time it takes to read a set of ranges through an index
This enables us to optimise reads for clustered indexes. */
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double
ha_innobase::read_time(
/*===================*/
			/* out: estimated time measured in disk seeks */
	uint    index,	/* in: key number */
	uint	ranges,	/* in: how many ranges */
	ha_rows rows)	/* in: estimated number of rows in the ranges */
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{
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	ha_rows total_rows;
	double  time_for_scan;
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5257

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	if (index != table->s->primary_key) {
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		/* Not clustered */
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	  	return(handler::read_time(index, ranges, rows));
	}
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	if (rows <= 2) {
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		return((double) rows);
	}
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	/* Assume that the read time is proportional to the scan time for all
	rows + at most one seek per range. */

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	time_for_scan = scan_time();
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	if ((total_rows = estimate_rows_upper_bound()) < rows) {
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	  	return(time_for_scan);
	}
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	return(ranges + (double) rows / (double) total_rows * time_for_scan);
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}

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/*************************************************************************
Returns statistics information of the table to the MySQL interpreter,
in various fields of the handle object. */

5285
int
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ha_innobase::info(
/*==============*/
	uint flag)	/* in: what information MySQL requests */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	dict_table_t*	ib_table;
	dict_index_t*	index;
5293
	ha_rows		rec_per_key;
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	ib_longlong	n_rows;
5295 5296
	ulong		j;
	ulong		i;
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	char		path[FN_REFLEN];
	os_file_stat_t  stat_info;
5299

5300 5301
 	DBUG_ENTER("info");

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        /* If we are forcing recovery at a high level, we will suppress
	statistics calculation on tables, because that may crash the
	server if an index is badly corrupted. */

        if (srv_force_recovery >= SRV_FORCE_NO_IBUF_MERGE) {

5308
                DBUG_RETURN(HA_ERR_CRASHED);
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        }

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	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(current_thd);

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

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	prebuilt->trx->op_info = (char*)"returning various info to MySQL";

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	trx_search_latch_release_if_reserved(prebuilt->trx);
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 	ib_table = prebuilt->table;

 	if (flag & HA_STATUS_TIME) {
 		/* In sql_show we call with this flag: update then statistics
 		so that they are up-to-date */

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	        prebuilt->trx->op_info = (char*)"updating table statistics";

5332
 		dict_update_statistics(ib_table);
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		prebuilt->trx->op_info = (char*)
		                          "returning various info to MySQL";
5336
		my_snprintf(path, sizeof(path), "%s/%s%s",
5337 5338
				    mysql_data_home, ib_table->name,
				    reg_ext);
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5339

5340
		unpack_filename(path,path);
5341

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		/* Note that we do not know the access time of the table,
5343 5344
		nor the CHECK TABLE time, nor the UPDATE or INSERT time. */

5345 5346 5347
		if (os_file_get_status(path,&stat_info)) {
			create_time = stat_info.ctime;
		}
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 	}

	if (flag & HA_STATUS_VARIABLE) {
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		n_rows = ib_table->stat_n_rows;

		/* Because we do not protect stat_n_rows by any mutex in a
		delete, it is theoretically possible that the value can be
		smaller than zero! TODO: fix this race.

		The MySQL optimizer seems to assume in a left join that n_rows
		is an accurate estimate if it is zero. Of course, it is not,
		since we do not have any locks on the rows yet at this phase.
		Since SHOW TABLE STATUS seems to call this function with the
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		HA_STATUS_TIME flag set, while the left join optimizer does not
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		set that flag, we add one to a zero value if the flag is not
		set. That way SHOW TABLE STATUS will show the best estimate,
		while the optimizer never sees the table empty. */

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

		if (n_rows == 0 && !(flag & HA_STATUS_TIME)) {
			n_rows++;
		}

    		records = (ha_rows)n_rows;
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    		deleted = 0;
    		data_file_length = ((ulonglong)
				ib_table->stat_clustered_index_size)
    					* UNIV_PAGE_SIZE;
    		index_file_length = ((ulonglong)
				ib_table->stat_sum_of_other_index_sizes)
    					* UNIV_PAGE_SIZE;
    		delete_length = 0;
    		check_time = 0;

    		if (records == 0) {
    			mean_rec_length = 0;
    		} else {
5388
    			mean_rec_length = (ulong) (data_file_length / records);
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    		}
    	}

	if (flag & HA_STATUS_CONST) {
		index = dict_table_get_first_index_noninline(ib_table);

		if (prebuilt->clust_index_was_generated) {
			index = dict_table_get_next_index_noninline(index);
		}
5398

5399
		for (i = 0; i < table->s->keys; i++) {
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			if (index == NULL) {
				ut_print_timestamp(stderr);
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				sql_print_error("Table %s contains fewer "
5403 5404 5405 5406
						"indexes inside InnoDB than "
						"are defined in the MySQL "
						".frm file. Have you mixed up "
						".frm files from different "
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						"installations? See "
"http://dev.mysql.com/doc/refman/5.0/en/innodb-troubleshooting.html\n",

5410
						ib_table->name);
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				break;
			}

5414 5415
			for (j = 0; j < table->key_info[i].key_parts; j++) {

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				if (j + 1 > index->n_uniq) {
				        ut_print_timestamp(stderr);
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					sql_print_error(
"Index %s of %s has %lu columns unique inside InnoDB, but MySQL is asking "
"statistics for %lu columns. Have you mixed up .frm files from different "
"installations? "
"See http://dev.mysql.com/doc/refman/5.0/en/innodb-troubleshooting.html\n",
5423 5424 5425 5426
							index->name,
							ib_table->name,
							(unsigned long)
							index->n_uniq, j + 1);
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				        break;
				}

5430 5431 5432 5433
				if (index->stat_n_diff_key_vals[j + 1] == 0) {

					rec_per_key = records;
				} else {
5434
					rec_per_key = (ha_rows)(records /
5435 5436 5437
   				         index->stat_n_diff_key_vals[j + 1]);
				}

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				/* Since MySQL seems to favor table scans
				too much over index searches, we pretend
				index selectivity is 2 times better than
				our estimate: */

				rec_per_key = rec_per_key / 2;

5445 5446 5447
				if (rec_per_key == 0) {
					rec_per_key = 1;
				}
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5448

5449 5450 5451
 				table->key_info[i].rec_per_key[j]=
				  rec_per_key >= ~(ulong) 0 ? ~(ulong) 0 :
				  rec_per_key;
5452
			}
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5453

5454
			index = dict_table_get_next_index_noninline(index);
5455 5456
		}
	}
5457 5458

  	if (flag & HA_STATUS_ERRKEY) {
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		ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);

5461
		errkey = (unsigned int) row_get_mysql_key_number_for_index(
5462 5463
				       (dict_index_t*)
				       trx_get_error_info(prebuilt->trx));
5464 5465
  	}

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	if (flag & HA_STATUS_AUTO && table->found_next_number_field) {
		longlong	auto_inc;
		int		ret;

		/* The following function call can the first time fail in
		a lock wait timeout error because it reserves the auto-inc
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		lock on the table. If it fails, then someone is already initing
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		the auto-inc counter, and the second call is guaranteed to
		succeed. */

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		ret = innobase_read_and_init_auto_inc(&auto_inc);
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		if (ret != 0) {
			ret = innobase_read_and_init_auto_inc(&auto_inc);

			if (ret != 0) {
				ut_print_timestamp(stderr);
				sql_print_error("Cannot get table %s auto-inc"
						"counter value in ::info\n",
						ib_table->name);
				auto_inc = 0;
			}
		}
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		auto_increment_value = auto_inc;
	}

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	prebuilt->trx->op_info = (char*)"";

5495
  	DBUG_RETURN(0);
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}

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/**************************************************************************
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Updates index cardinalities of the table, based on 8 random dives into
each index tree. This does NOT calculate exact statistics on the table. */
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int
ha_innobase::analyze(
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/*=================*/
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					/* out: returns always 0 (success) */
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
{
	/* Simply call ::info() with all the flags */
	info(HA_STATUS_TIME | HA_STATUS_CONST | HA_STATUS_VARIABLE);

	return(0);
}

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/**************************************************************************
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This is mapped to "ALTER TABLE tablename TYPE=InnoDB", which rebuilds
the table in MySQL. */
5518

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int
ha_innobase::optimize(
/*==================*/
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
5524
{
5525
        return(HA_ADMIN_TRY_ALTER);
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}

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/***********************************************************************
Tries to check that an InnoDB table is not corrupted. If corruption is
noticed, prints to stderr information about it. In case of corruption
may also assert a failure and crash the server. */

int
ha_innobase::check(
/*===============*/
					/* out: HA_ADMIN_CORRUPT or
					HA_ADMIN_OK */
	THD* 		thd,		/* in: user thread handle */
	HA_CHECK_OPT* 	check_opt)	/* in: check options, currently
					ignored */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	ulint		ret;
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	ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);
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	ut_a(prebuilt->trx ==
5547
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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	if (prebuilt->mysql_template == NULL) {
		/* Build the template; we will use a dummy template
		in index scans done in checking */

		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}

	ret = row_check_table_for_mysql(prebuilt);

	if (ret == DB_SUCCESS) {
		return(HA_ADMIN_OK);
	}
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  	return(HA_ADMIN_CORRUPT);
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}

5565
/*****************************************************************
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Adds information about free space in the InnoDB tablespace to a table comment
which is printed out when a user calls SHOW TABLE STATUS. Adds also info on
foreign keys. */
5569 5570 5571 5572

char*
ha_innobase::update_table_comment(
/*==============================*/
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				/* out: table comment + InnoDB free space +
				info on foreign keys */
        const char*	comment)/* in: table comment defined by user */
5576
{
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	uint	length			= (uint) strlen(comment);
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	char*				str;
	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
5580
	long	flen;
5581

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	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

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	if (length > 64000 - 3) {
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		return((char*)comment); /* string too long */
	}

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	update_thd(current_thd);

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	prebuilt->trx->op_info = (char*)"returning table comment";

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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
5598
	str = NULL;
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5600
	/* output the data to a temporary file */
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	mutex_enter_noninline(&srv_dict_tmpfile_mutex);
	rewind(srv_dict_tmpfile);

	fprintf(srv_dict_tmpfile, "InnoDB free: %lu kB",
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      		   (ulong) fsp_get_available_space_in_free_extents(
      					prebuilt->table->space));
5608

5609
	dict_print_info_on_foreign_keys(FALSE, srv_dict_tmpfile,
5610
				prebuilt->trx, prebuilt->table);
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	flen = ftell(srv_dict_tmpfile);
	if (flen < 0) {
		flen = 0;
	} else if (length + flen + 3 > 64000) {
		flen = 64000 - 3 - length;
	}
5617

5618 5619
	/* allocate buffer for the full string, and
	read the contents of the temporary file */
5620

5621
	str = my_malloc(length + flen + 3, MYF(0));
5622

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	if (str) {
		char* pos	= str + length;
		if (length) {
			memcpy(str, comment, length);
			*pos++ = ';';
			*pos++ = ' ';
5629
		}
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		rewind(srv_dict_tmpfile);
		flen = (uint) fread(pos, 1, flen, srv_dict_tmpfile);
		pos[flen] = 0;
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	}
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5635 5636
	mutex_exit_noninline(&srv_dict_tmpfile_mutex);

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        prebuilt->trx->op_info = (char*)"";

5639
  	return(str ? str : (char*) comment);
5640 5641
}

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/***********************************************************************
Gets the foreign key create info for a table stored in InnoDB. */

char*
ha_innobase::get_foreign_key_create_info(void)
/*==========================================*/
			/* out, own: character string in the form which
			can be inserted to the CREATE TABLE statement,
			MUST be freed with ::free_foreign_key_create_info */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
5653
	char*	str	= 0;
5654
	long	flen;
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	ut_a(prebuilt != NULL);
5657

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	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(current_thd);

5664
	prebuilt->trx->op_info = (char*)"getting info on foreign keys";
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	/* In case MySQL calls this in the middle of a SELECT query,
	release possible adaptive hash latch to avoid
	deadlocks of threads */
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5670
	trx_search_latch_release_if_reserved(prebuilt->trx);
5671

5672 5673
	mutex_enter_noninline(&srv_dict_tmpfile_mutex);
	rewind(srv_dict_tmpfile);
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5675 5676
	/* output the data to a temporary file */
	dict_print_info_on_foreign_keys(TRUE, srv_dict_tmpfile,
5677
				prebuilt->trx, prebuilt->table);
5678
	prebuilt->trx->op_info = (char*)"";
5679

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	flen = ftell(srv_dict_tmpfile);
	if (flen < 0) {
		flen = 0;
	} else if (flen > 64000 - 1) {
		flen = 64000 - 1;
	}
5686

5687 5688
	/* allocate buffer for the string, and
	read the contents of the temporary file */
5689

5690
	str = my_malloc(flen + 1, MYF(0));
5691

5692 5693 5694 5695
	if (str) {
		rewind(srv_dict_tmpfile);
		flen = (uint) fread(str, 1, flen, srv_dict_tmpfile);
		str[flen] = 0;
5696
	}
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5698 5699
	mutex_exit_noninline(&srv_dict_tmpfile_mutex);

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  	return(str);
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}
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5703

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int
5705 5706 5707 5708 5709 5710 5711 5712 5713 5714
ha_innobase::get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list)
{
  dict_foreign_t* foreign;

  DBUG_ENTER("get_foreign_key_list");
  row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
  ut_a(prebuilt != NULL);
  update_thd(current_thd);
  prebuilt->trx->op_info = (char*)"getting list of foreign keys";
  trx_search_latch_release_if_reserved(prebuilt->trx);
5715
  mutex_enter_noninline(&(dict_sys->mutex));
5716 5717
  foreign = UT_LIST_GET_FIRST(prebuilt->table->foreign_list);

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  while (foreign != NULL)
5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729
  {
    uint i;
    FOREIGN_KEY_INFO f_key_info;
    LEX_STRING *name= 0;
    const char *tmp_buff;

    tmp_buff= foreign->id;
    i= 0;
    while (tmp_buff[i] != '/')
      i++;
    tmp_buff+= i + 1;
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    f_key_info.forein_id= make_lex_string(thd, 0, tmp_buff,
                                          (uint) strlen(tmp_buff), 1);
5732 5733 5734 5735
    tmp_buff= foreign->referenced_table_name;
    i= 0;
    while (tmp_buff[i] != '/')
      i++;
5736
    f_key_info.referenced_db= make_lex_string(thd, 0,
5737 5738
                                              tmp_buff, i, 1);
    tmp_buff+= i + 1;
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    f_key_info.referenced_table= make_lex_string(thd, 0, tmp_buff,
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                                               (uint) strlen(tmp_buff), 1);
5741 5742 5743 5744

    for (i= 0;;)
    {
      tmp_buff= foreign->foreign_col_names[i];
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      name= make_lex_string(thd, name, tmp_buff, (uint) strlen(tmp_buff), 1);
5746 5747
      f_key_info.foreign_fields.push_back(name);
      tmp_buff= foreign->referenced_col_names[i];
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      name= make_lex_string(thd, name, tmp_buff, (uint) strlen(tmp_buff), 1);
5749 5750 5751 5752 5753 5754 5755 5756 5757 5758
      f_key_info.referenced_fields.push_back(name);
      if (++i >= foreign->n_fields)
        break;
    }

    ulong length= 0;
    if (foreign->type == DICT_FOREIGN_ON_DELETE_CASCADE)
    {
      length=17;
      tmp_buff= "ON DELETE CASCADE";
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5759
    }
5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788
    else if (foreign->type == DICT_FOREIGN_ON_DELETE_SET_NULL)
    {
      length=18;
      tmp_buff= "ON DELETE SET NULL";
    }
    else if (foreign->type == DICT_FOREIGN_ON_DELETE_NO_ACTION)
    {
      length=19;
      tmp_buff= "ON DELETE NO ACTION";
    }
    else if (foreign->type == DICT_FOREIGN_ON_UPDATE_CASCADE)
    {
      length=17;
      tmp_buff= "ON UPDATE CASCADE";
    }
    else if (foreign->type == DICT_FOREIGN_ON_UPDATE_SET_NULL)
    {
      length=18;
      tmp_buff= "ON UPDATE SET NULL";
    }
    else if (foreign->type == DICT_FOREIGN_ON_UPDATE_NO_ACTION)
    {
      length=19;
      tmp_buff= "ON UPDATE NO ACTION";
    }
    f_key_info.constraint_method= make_lex_string(thd,
                                                  f_key_info.constraint_method,
                                                  tmp_buff, length, 1);

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    FOREIGN_KEY_INFO *pf_key_info= ((FOREIGN_KEY_INFO *)
5790 5791 5792 5793 5794
                                    thd->memdup((gptr) &f_key_info,
                                                sizeof(FOREIGN_KEY_INFO)));
    f_key_list->push_back(pf_key_info);
    foreign = UT_LIST_GET_NEXT(foreign_list, foreign);
  }
5795
  mutex_exit_noninline(&(dict_sys->mutex));
5796 5797 5798 5799
  prebuilt->trx->op_info = (char*)"";
  DBUG_RETURN(0);
}

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/*********************************************************************
Checks if ALTER TABLE may change the storage engine of the table.
Changing storage engines is not allowed for tables for which there
are foreign key constraints (parent or child tables). */

bool
ha_innobase::can_switch_engines(void)
/*=================================*/
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	bool	can_switch;

 	DBUG_ENTER("ha_innobase::can_switch_engines");
	prebuilt->trx->op_info =
			"determining if there are foreign key constraints";
	row_mysql_lock_data_dictionary(prebuilt->trx);

	can_switch = !UT_LIST_GET_FIRST(prebuilt->table->referenced_list)
			&& !UT_LIST_GET_FIRST(prebuilt->table->foreign_list);

	row_mysql_unlock_data_dictionary(prebuilt->trx);
	prebuilt->trx->op_info = "";

	DBUG_RETURN(can_switch);
}

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/***********************************************************************
Checks if a table is referenced by a foreign key. The MySQL manual states that
a REPLACE is either equivalent to an INSERT, or DELETE(s) + INSERT. Only a
delete is then allowed internally to resolve a duplicate key conflict in
REPLACE, not an update. */

uint
ha_innobase::referenced_by_foreign_key(void)
/*========================================*/
			/* out: > 0 if referenced by a FOREIGN KEY */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;

	if (dict_table_referenced_by_foreign_key(prebuilt->table)) {

		return(1);
	}

	return(0);
}
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/***********************************************************************
Frees the foreign key create info for a table stored in InnoDB, if it is
non-NULL. */

void
ha_innobase::free_foreign_key_create_info(
/*======================================*/
	char*	str)	/* in, own: create info string to free  */
{
	if (str) {
5857
		my_free(str, MYF(0));
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	}
5859 5860
}

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/***********************************************************************
Tells something additional to the handler about how to do things. */

int
ha_innobase::extra(
/*===============*/
			   /* out: 0 or error number */
	enum ha_extra_function operation)
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                           /* in: HA_EXTRA_RETRIEVE_ALL_COLS or some
			   other flag */
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{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;

	/* Warning: since it is not sure that MySQL calls external_lock
	before calling this function, the trx field in prebuilt can be
	obsolete! */

	switch (operation) {
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                case HA_EXTRA_FLUSH:
                        if (prebuilt->blob_heap) {
                                row_mysql_prebuilt_free_blob_heap(prebuilt);
                        }
                        break;
                case HA_EXTRA_RESET:
                        if (prebuilt->blob_heap) {
                                row_mysql_prebuilt_free_blob_heap(prebuilt);
                        }
5888
                        prebuilt->keep_other_fields_on_keyread = 0;
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                        prebuilt->read_just_key = 0;
                        break;
  		case HA_EXTRA_RESET_STATE:
5892
	        	prebuilt->keep_other_fields_on_keyread = 0;
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	        	prebuilt->read_just_key = 0;
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    	        	break;
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		case HA_EXTRA_NO_KEYREAD:
    			prebuilt->read_just_key = 0;
    			break;
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	        case HA_EXTRA_RETRIEVE_ALL_COLS:
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			prebuilt->hint_need_to_fetch_extra_cols
					= ROW_RETRIEVE_ALL_COLS;
			break;
	        case HA_EXTRA_RETRIEVE_PRIMARY_KEY:
			if (prebuilt->hint_need_to_fetch_extra_cols == 0) {
				prebuilt->hint_need_to_fetch_extra_cols
					= ROW_RETRIEVE_PRIMARY_KEY;
			}
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			break;
	        case HA_EXTRA_KEYREAD:
	        	prebuilt->read_just_key = 1;
	        	break;
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		case HA_EXTRA_KEYREAD_PRESERVE_FIELDS:
			prebuilt->keep_other_fields_on_keyread = 1;
			break;
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		default:/* Do nothing */
			;
	}

	return(0);
}

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/**********************************************************************
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MySQL calls this function at the start of each SQL statement inside LOCK
TABLES. Inside LOCK TABLES the ::external_lock method does not work to
mark SQL statement borders. Note also a special case: if a temporary table
is created inside LOCK TABLES, MySQL has not called external_lock() at all
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on that table.
MySQL-5.0 also calls this before each statement in an execution of a stored
procedure. To make the execution more deterministic for binlogging, MySQL-5.0
locks all tables involved in a stored procedure with full explicit table
locks (thd->in_lock_tables is true in ::store_lock()) before executing the
procedure. */
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int
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ha_innobase::start_stmt(
/*====================*/
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	              /* out: 0 or error code */
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	THD*    thd,  /* in: handle to the user thread */
        thr_lock_type lock_type)
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{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

	update_thd(thd);

	trx = prebuilt->trx;

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	/* Here we release the search latch and the InnoDB thread FIFO ticket
	if they were reserved. They should have been released already at the
	end of the previous statement, but because inside LOCK TABLES the
	lock count method does not work to mark the end of a SELECT statement,
	that may not be the case. We MUST release the search latch before an
	INSERT, for example. */

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	innobase_release_stat_resources(trx);

	prebuilt->sql_stat_start = TRUE;
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	prebuilt->hint_need_to_fetch_extra_cols = 0;
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	prebuilt->read_just_key = 0;
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        prebuilt->keep_other_fields_on_keyread = FALSE;
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	if (!prebuilt->mysql_has_locked) {
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	        /* This handle is for a temporary table created inside
	        this same LOCK TABLES; since MySQL does NOT call external_lock
	        in this case, we must use x-row locks inside InnoDB to be
	        prepared for an update of a row */
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	        prebuilt->select_lock_type = LOCK_X;
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	} else {
		if (trx->isolation_level != TRX_ISO_SERIALIZABLE
		    && thd->lex->sql_command == SQLCOM_SELECT
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		    && lock_type == TL_READ) {
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			/* For other than temporary tables, we obtain
			no lock for consistent read (plain SELECT). */

			prebuilt->select_lock_type = LOCK_NONE;
		} else {
			/* Not a consistent read: restore the
			select_lock_type value. The value of
			stored_select_lock_type was decided in:
			1) ::store_lock(),
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			2) ::external_lock(),
			3) ::init_table_handle_for_HANDLER(), and
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			4) :.transactional_table_lock(). */
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			prebuilt->select_lock_type =
				prebuilt->stored_select_lock_type;
		}
	}

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	trx->detailed_error[0] = '\0';

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	/* Set the MySQL flag to mark that there is an active transaction */
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        if (trx->active_trans == 0) {

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                innobase_register_trx_and_stmt(thd);
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                trx->active_trans = 1;
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        } else {
		innobase_register_stmt(thd);
	}
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	return(0);
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}

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/**********************************************************************
Maps a MySQL trx isolation level code to the InnoDB isolation level code */
inline
ulint
innobase_map_isolation_level(
/*=========================*/
					/* out: InnoDB isolation level */
	enum_tx_isolation	iso)	/* in: MySQL isolation level code */
{
	switch(iso) {
		case ISO_REPEATABLE_READ: return(TRX_ISO_REPEATABLE_READ);
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		case ISO_READ_COMMITTED: return(TRX_ISO_READ_COMMITTED);
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		case ISO_SERIALIZABLE: return(TRX_ISO_SERIALIZABLE);
		case ISO_READ_UNCOMMITTED: return(TRX_ISO_READ_UNCOMMITTED);
		default: ut_a(0); return(0);
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	}
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}
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/**********************************************************************
As MySQL will execute an external lock for every new table it uses when it
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starts to process an SQL statement (an exception is when MySQL calls
start_stmt for the handle) we can use this function to store the pointer to
the THD in the handle. We will also use this function to communicate
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to InnoDB that a new SQL statement has started and that we must store a
savepoint to our transaction handle, so that we are able to roll back
the SQL statement in case of an error. */

int
ha_innobase::external_lock(
/*=======================*/
6035
			        /* out: 0 */
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	THD*	thd,		/* in: handle to the user thread */
	int 	lock_type)	/* in: lock type */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

  	DBUG_ENTER("ha_innobase::external_lock");
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	DBUG_PRINT("enter",("lock_type: %d", lock_type));
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	update_thd(thd);

	trx = prebuilt->trx;

	prebuilt->sql_stat_start = TRUE;
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	prebuilt->hint_need_to_fetch_extra_cols = 0;
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	prebuilt->read_just_key = 0;
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	prebuilt->keep_other_fields_on_keyread = FALSE;
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	if (lock_type == F_WRLCK) {

		/* If this is a SELECT, then it is in UPDATE TABLE ...
		or SELECT ... FOR UPDATE */
		prebuilt->select_lock_type = LOCK_X;
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		prebuilt->stored_select_lock_type = LOCK_X;
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	}

	if (lock_type != F_UNLCK) {
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		/* MySQL is setting a new table lock */
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		trx->detailed_error[0] = '\0';
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		/* Set the MySQL flag to mark that there is an active
		transaction */
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                if (trx->active_trans == 0) {

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                        innobase_register_trx_and_stmt(thd);
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                        trx->active_trans = 1;
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                } else if (trx->n_mysql_tables_in_use == 0) {
			innobase_register_stmt(thd);
		}
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		trx->n_mysql_tables_in_use++;
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		prebuilt->mysql_has_locked = TRUE;
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		if (trx->n_mysql_tables_in_use == 1) {
		        trx->isolation_level = innobase_map_isolation_level(
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						(enum_tx_isolation)
						thd->variables.tx_isolation);
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	                      if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
				  && trx->global_read_view) {

				/* At low transaction isolation levels we let
				each consistent read set its own snapshot */

				read_view_close_for_mysql(trx);
                        }
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		}
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		if (trx->isolation_level == TRX_ISO_SERIALIZABLE
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		    && prebuilt->select_lock_type == LOCK_NONE
		    && (thd->options
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				& (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
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			/* To get serializable execution, we let InnoDB
			conceptually add 'LOCK IN SHARE MODE' to all SELECTs
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			which otherwise would have been consistent reads. An
			exception is consistent reads in the AUTOCOMMIT=1 mode:
			we know that they are read-only transactions, and they
			can be serialized also if performed as consistent
			reads. */
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			prebuilt->select_lock_type = LOCK_S;
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			prebuilt->stored_select_lock_type = LOCK_S;
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		}

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		/* Starting from 4.1.9, no InnoDB table lock is taken in LOCK
		TABLES if AUTOCOMMIT=1. It does not make much sense to acquire
		an InnoDB table lock if it is released immediately at the end
		of LOCK TABLES, and InnoDB's table locks in that case cause
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		VERY easily deadlocks.
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		We do not set InnoDB table locks if user has not explicitly
		requested a table lock. Note that thd->in_lock_tables
		can  be TRUE on some cases e.g. at the start of a stored
		procedure call (SQLCOM_CALL). */
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		if (prebuilt->select_lock_type != LOCK_NONE) {
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			if (thd->in_lock_tables &&
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			    thd->lex->sql_command == SQLCOM_LOCK_TABLES &&
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			    thd->variables.innodb_table_locks &&
			    (thd->options & OPTION_NOT_AUTOCOMMIT)) {
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				ulint	error;
6132
				error = row_lock_table_for_mysql(prebuilt,
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							NULL, 0);
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				if (error != DB_SUCCESS) {
					error = convert_error_code_to_mysql(
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						(int) error, user_thd);
					DBUG_RETURN((int) error);
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				}
			}
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		  	trx->mysql_n_tables_locked++;
		}

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		DBUG_RETURN(0);
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	}
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	/* MySQL is releasing a table lock */
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	trx->n_mysql_tables_in_use--;
	prebuilt->mysql_has_locked = FALSE;
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	/* If the MySQL lock count drops to zero we know that the current SQL
	statement has ended */
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	if (trx->n_mysql_tables_in_use == 0) {
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	        trx->mysql_n_tables_locked = 0;
		prebuilt->used_in_HANDLER = FALSE;
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		/* Release a possible FIFO ticket and search latch. Since we
		may reserve the kernel mutex, we have to release the search
		system latch first to obey the latching order. */

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		innobase_release_stat_resources(trx);
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		if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
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                        if (trx->active_trans != 0) {
                                innobase_commit(thd, TRUE);
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			}
		} else {
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			if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
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	    					&& trx->global_read_view) {
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				/* At low transaction isolation levels we let
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				each consistent read set its own snapshot */

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				read_view_close_for_mysql(trx);
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			}
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		}
	}

6183
	DBUG_RETURN(0);
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}

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/**********************************************************************
With this function MySQL request a transactional lock to a table when
user issued query LOCK TABLES..WHERE ENGINE = InnoDB. */

int
ha_innobase::transactional_table_lock(
/*==================================*/
6193
			        /* out: error code */
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	THD*	thd,		/* in: handle to the user thread */
	int 	lock_type)	/* in: lock type */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

  	DBUG_ENTER("ha_innobase::transactional_table_lock");
	DBUG_PRINT("enter",("lock_type: %d", lock_type));

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(thd);

 	if (prebuilt->table->ibd_file_missing && !current_thd->tablespace_op) {
	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"MySQL is trying to use a table handle but the .ibd file for\n"
"table %s does not exist.\n"
"Have you deleted the .ibd file from the database directory under\n"
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"the MySQL datadir?"
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"See http://dev.mysql.com/doc/refman/5.0/en/innodb-troubleshooting.html\n"
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"how you can resolve the problem.\n",
				prebuilt->table->name);
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	trx = prebuilt->trx;

	prebuilt->sql_stat_start = TRUE;
	prebuilt->hint_need_to_fetch_extra_cols = 0;

	prebuilt->read_just_key = 0;
	prebuilt->keep_other_fields_on_keyread = FALSE;

	if (lock_type == F_WRLCK) {
		prebuilt->select_lock_type = LOCK_X;
		prebuilt->stored_select_lock_type = LOCK_X;
	} else if (lock_type == F_RDLCK) {
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		prebuilt->select_lock_type = LOCK_S;
		prebuilt->stored_select_lock_type = LOCK_S;
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	} else {
	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"MySQL is trying to set transactional table lock with corrupted lock type\n"
"to table %s, lock type %d does not exist.\n",
				prebuilt->table->name, lock_type);
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	/* MySQL is setting a new transactional table lock */

	/* Set the MySQL flag to mark that there is an active transaction */
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        if (trx->active_trans == 0) {

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                innobase_register_trx_and_stmt(thd);
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                trx->active_trans = 1;
        }
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	if (thd->in_lock_tables && thd->variables.innodb_table_locks) {
		ulint	error = DB_SUCCESS;

6257
		error = row_lock_table_for_mysql(prebuilt, NULL, 0);
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		if (error != DB_SUCCESS) {
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			error = convert_error_code_to_mysql((int) error, user_thd);
			DBUG_RETURN((int) error);
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		}

		if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

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			/* Store the current undo_no of the transaction
			so that we know where to roll back if we have
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			to roll back the next SQL statement */

			trx_mark_sql_stat_end(trx);
		}
	}

	DBUG_RETURN(0);
}

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/****************************************************************************
Here we export InnoDB status variables to MySQL.  */

void
innodb_export_status(void)
/*======================*/
{
  srv_export_innodb_status();
}

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/****************************************************************************
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Implements the SHOW INNODB STATUS command. Sends the output of the InnoDB
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Monitor to the client. */

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bool
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innodb_show_status(
/*===============*/
	THD*	thd)	/* in: the MySQL query thread of the caller */
{
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	Protocol*		protocol = thd->protocol;
	trx_t*			trx;
	static const char	truncated_msg[] = "... truncated...\n";
	const long		MAX_STATUS_SIZE = 64000;
	ulint			trx_list_start = ULINT_UNDEFINED;
	ulint			trx_list_end = ULINT_UNDEFINED;
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        DBUG_ENTER("innodb_show_status");

6305
        if (have_innodb != SHOW_OPTION_YES) {
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                my_message(ER_NOT_SUPPORTED_YET,
          "Cannot call SHOW INNODB STATUS because skip-innodb is defined",
                           MYF(0));
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                DBUG_RETURN(TRUE);
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        }
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	trx = check_trx_exists(thd);

	innobase_release_stat_resources(trx);

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	/* We let the InnoDB Monitor to output at most MAX_STATUS_SIZE
	bytes of text. */
6318

6319
	long	flen, usable_len;
6320
	char*	str;
6321

6322
	mutex_enter_noninline(&srv_monitor_file_mutex);
6323
	rewind(srv_monitor_file);
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	srv_printf_innodb_monitor(srv_monitor_file,
				&trx_list_start, &trx_list_end);
6326
	flen = ftell(srv_monitor_file);
6327
	os_file_set_eof(srv_monitor_file);
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	if (flen < 0) {
		flen = 0;
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	}

	if (flen > MAX_STATUS_SIZE) {
		usable_len = MAX_STATUS_SIZE;
	} else {
		usable_len = flen;
6337
	}
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	/* allocate buffer for the string, and
	read the contents of the temporary file */
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6342
	if (!(str = my_malloc(usable_len + 1, MYF(0))))
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        {
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          mutex_exit_noninline(&srv_monitor_file_mutex);
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          DBUG_RETURN(TRUE);
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        }
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	rewind(srv_monitor_file);
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	if (flen < MAX_STATUS_SIZE) {
		/* Display the entire output. */
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		flen = (long) fread(str, 1, flen, srv_monitor_file);
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	} else if (trx_list_end < (ulint) flen
			&& trx_list_start < trx_list_end
			&& trx_list_start + (flen - trx_list_end)
			< MAX_STATUS_SIZE - sizeof truncated_msg - 1) {
		/* Omit the beginning of the list of active transactions. */
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		long len = (long) fread(str, 1, trx_list_start, srv_monitor_file);
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		memcpy(str + len, truncated_msg, sizeof truncated_msg - 1);
		len += sizeof truncated_msg - 1;
		usable_len = (MAX_STATUS_SIZE - 1) - len;
		fseek(srv_monitor_file, flen - usable_len, SEEK_SET);
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		len += (long) fread(str + len, 1, usable_len, srv_monitor_file);
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		flen = len;
	} else {
		/* Omit the end of the output. */
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		flen = (long) fread(str, 1, MAX_STATUS_SIZE - 1, srv_monitor_file);
6367
	}
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6369
	mutex_exit_noninline(&srv_monitor_file_mutex);
6370

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	List<Item> field_list;

6373
	field_list.push_back(new Item_empty_string("Status", flen));
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	if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS |
                                               Protocol::SEND_EOF)) {
6377
		my_free(str, MYF(0));
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		DBUG_RETURN(TRUE);
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	}

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        protocol->prepare_for_resend();
        protocol->store(str, flen, system_charset_info);
        my_free(str, MYF(0));
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        if (protocol->write()) {
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        	DBUG_RETURN(TRUE);
	}
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	send_eof(thd);
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  	DBUG_RETURN(FALSE);
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}

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/****************************************************************************
Implements the SHOW MUTEX STATUS command. . */

bool
innodb_mutex_show_status(
/*===============*/
  THD*  thd)  /* in: the MySQL query thread of the caller */
{
  Protocol        *protocol= thd->protocol;
  List<Item> field_list;
  mutex_t*  mutex;
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#ifdef UNIV_DEBUG
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  ulint   rw_lock_count= 0;
  ulint   rw_lock_count_spin_loop= 0;
  ulint   rw_lock_count_spin_rounds= 0;
  ulint   rw_lock_count_os_wait= 0;
  ulint   rw_lock_count_os_yield= 0;
  ulonglong rw_lock_wait_time= 0;
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#endif /* UNIV_DEBUG */
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  DBUG_ENTER("innodb_mutex_show_status");

6416
#ifdef UNIV_DEBUG
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  field_list.push_back(new Item_empty_string("Mutex", FN_REFLEN));
  field_list.push_back(new Item_empty_string("Module", FN_REFLEN));
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  field_list.push_back(new Item_uint("Count", MY_INT64_NUM_DECIMAL_DIGITS));
  field_list.push_back(new Item_uint("Spin_waits", MY_INT64_NUM_DECIMAL_DIGITS));
  field_list.push_back(new Item_uint("Spin_rounds", MY_INT64_NUM_DECIMAL_DIGITS));
  field_list.push_back(new Item_uint("OS_waits", MY_INT64_NUM_DECIMAL_DIGITS));
  field_list.push_back(new Item_uint("OS_yields", MY_INT64_NUM_DECIMAL_DIGITS));
  field_list.push_back(new Item_uint("OS_waits_time", MY_INT64_NUM_DECIMAL_DIGITS));
6425 6426
#else /* UNIV_DEBUG */
  field_list.push_back(new Item_empty_string("File", FN_REFLEN));
6427 6428
  field_list.push_back(new Item_uint("Line", MY_INT64_NUM_DECIMAL_DIGITS));
  field_list.push_back(new Item_uint("OS_waits", MY_INT64_NUM_DECIMAL_DIGITS));
6429
#endif /* UNIV_DEBUG */
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  if (protocol->send_fields(&field_list,
                            Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
    DBUG_RETURN(TRUE);

6435
  mutex_enter_noninline(&mutex_list_mutex);
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  mutex = UT_LIST_GET_FIRST(mutex_list);

  while ( mutex != NULL )
  {
6441
#ifdef UNIV_DEBUG
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    if (mutex->mutex_type != 1)
    {
      if (mutex->count_using > 0)
      {
        protocol->prepare_for_resend();
        protocol->store(mutex->cmutex_name, system_charset_info);
        protocol->store(mutex->cfile_name, system_charset_info);
        protocol->store((ulonglong)mutex->count_using);
        protocol->store((ulonglong)mutex->count_spin_loop);
        protocol->store((ulonglong)mutex->count_spin_rounds);
        protocol->store((ulonglong)mutex->count_os_wait);
        protocol->store((ulonglong)mutex->count_os_yield);
        protocol->store((ulonglong)mutex->lspent_time/1000);

        if (protocol->write())
        {
6458
          mutex_exit_noninline(&mutex_list_mutex);
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          DBUG_RETURN(1);
        }
      }
    }
    else
    {
      rw_lock_count += mutex->count_using;
      rw_lock_count_spin_loop += mutex->count_spin_loop;
      rw_lock_count_spin_rounds += mutex->count_spin_rounds;
      rw_lock_count_os_wait += mutex->count_os_wait;
      rw_lock_count_os_yield += mutex->count_os_yield;
      rw_lock_wait_time += mutex->lspent_time;
    }
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#else /* UNIV_DEBUG */
    protocol->prepare_for_resend();
    protocol->store(mutex->cfile_name, system_charset_info);
    protocol->store((ulonglong)mutex->cline);
    protocol->store((ulonglong)mutex->count_os_wait);

    if (protocol->write())
    {
      mutex_exit_noninline(&mutex_list_mutex);
      DBUG_RETURN(1);
    }
#endif /* UNIV_DEBUG */
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    mutex = UT_LIST_GET_NEXT(list, mutex);
  }

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  mutex_exit_noninline(&mutex_list_mutex);

#ifdef UNIV_DEBUG
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  protocol->prepare_for_resend();
  protocol->store("rw_lock_mutexes", system_charset_info);
  protocol->store("", system_charset_info);
  protocol->store((ulonglong)rw_lock_count);
  protocol->store((ulonglong)rw_lock_count_spin_loop);
  protocol->store((ulonglong)rw_lock_count_spin_rounds);
  protocol->store((ulonglong)rw_lock_count_os_wait);
  protocol->store((ulonglong)rw_lock_count_os_yield);
  protocol->store((ulonglong)rw_lock_wait_time/1000);

  if (protocol->write())
  {
    DBUG_RETURN(1);
  }
6505
#endif /* UNIV_DEBUG */
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  send_eof(thd);
  DBUG_RETURN(FALSE);
}

6511 6512 6513 6514 6515
/****************************************************************************
 Handling the shared INNOBASE_SHARE structure that is needed to provide table
 locking.
****************************************************************************/

6516
static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
6517 6518 6519
			      my_bool not_used __attribute__((unused)))
{
  *length=share->table_name_length;
6520
  return (mysql_byte*) share->table_name;
6521 6522 6523 6524
}

static INNOBASE_SHARE *get_share(const char *table_name)
{
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	INNOBASE_SHARE *share;
	pthread_mutex_lock(&innobase_share_mutex);
	uint length=(uint) strlen(table_name);
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	if (!(share=(INNOBASE_SHARE*) hash_search(&innobase_open_tables,
				(mysql_byte*) table_name,
				length))) {

		share = (INNOBASE_SHARE *) my_malloc(sizeof(*share)+length+1,
			MYF(MY_FAE | MY_ZEROFILL));

		share->table_name_length=length;
		share->table_name=(char*) (share+1);
		strmov(share->table_name,table_name);

		if (my_hash_insert(&innobase_open_tables,
				(mysql_byte*) share)) {
			pthread_mutex_unlock(&innobase_share_mutex);
			my_free((gptr) share,0);
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			return 0;
		}
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		thr_lock_init(&share->lock);
		pthread_mutex_init(&share->mutex,MY_MUTEX_INIT_FAST);
	}
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	share->use_count++;
	pthread_mutex_unlock(&innobase_share_mutex);
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6554

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	return share;
6556 6557 6558 6559
}

static void free_share(INNOBASE_SHARE *share)
{
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  pthread_mutex_lock(&innobase_share_mutex);
6561 6562
  if (!--share->use_count)
  {
6563
    hash_delete(&innobase_open_tables, (mysql_byte*) share);
6564 6565 6566 6567
    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((gptr) share, MYF(0));
  }
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  pthread_mutex_unlock(&innobase_share_mutex);
6569
}
6570 6571

/*********************************************************************
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Converts a MySQL table lock stored in the 'lock' field of the handle to
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a proper type before storing pointer to the lock into an array of pointers.
MySQL also calls this if it wants to reset some table locks to a not-locked
state during the processing of an SQL query. An example is that during a
SELECT the read lock is released early on the 'const' tables where we only
fetch one row. MySQL does not call this when it releases all locks at the
end of an SQL statement. */
6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591

THR_LOCK_DATA**
ha_innobase::store_lock(
/*====================*/
						/* out: pointer to the next
						element in the 'to' array */
	THD*			thd,		/* in: user thread handle */
	THR_LOCK_DATA**		to,		/* in: pointer to an array
						of pointers to lock structs;
						pointer to the 'lock' field
						of current handle is stored
						next to this array */
	enum thr_lock_type 	lock_type)	/* in: lock type to store in
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						'lock'; this may also be
						TL_IGNORE */
6594 6595 6596
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;

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	/* NOTE: MySQL  can call this function with lock 'type' TL_IGNORE!
	Be careful to ignore TL_IGNORE if we are going to do something with
	only 'real' locks! */

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6601
	if ((lock_type == TL_READ && thd->in_lock_tables) ||
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	    (lock_type == TL_READ_HIGH_PRIORITY && thd->in_lock_tables) ||
	    lock_type == TL_READ_WITH_SHARED_LOCKS ||
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	    lock_type == TL_READ_NO_INSERT ||
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	    (thd->lex->sql_command != SQLCOM_SELECT
	     && lock_type != TL_IGNORE)) {
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6607

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		/* The OR cases above are in this order:
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		1) MySQL is doing LOCK TABLES ... READ LOCAL, or we
		are processing a stored procedure or function, or
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		2) (we do not know when TL_READ_HIGH_PRIORITY is used), or
		3) this is a SELECT ... IN SHARE MODE, or
		4) we are doing a complex SQL statement like
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		INSERT INTO ... SELECT ... and the logical logging (MySQL
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		binlog) requires the use of a locking read, or
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		MySQL is doing LOCK TABLES ... READ.
		5) we let InnoDB do locking reads for all SQL statements that
		are not simple SELECTs; note that select_lock_type in this
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		case may get strengthened in ::external_lock() to LOCK_X.
		Note that we MUST use a locking read in all data modifying
		SQL statements, because otherwise the execution would not be
		serializable, and also the results from the update could be
		unexpected if an obsolete consistent read view would be
		used. */
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6626 6627 6628
		if (srv_locks_unsafe_for_binlog &&
		    prebuilt->trx->isolation_level != TRX_ISO_SERIALIZABLE &&
		    (lock_type == TL_READ || lock_type == TL_READ_NO_INSERT) &&
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		    (thd->lex->sql_command == SQLCOM_INSERT_SELECT ||
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		     thd->lex->sql_command == SQLCOM_UPDATE ||
		     thd->lex->sql_command == SQLCOM_CREATE_TABLE)) {
6632 6633 6634 6635

			/* In case we have innobase_locks_unsafe_for_binlog
			option set and isolation level of the transaction
			is not set to serializable and MySQL is doing
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			INSERT INTO...SELECT or UPDATE ... = (SELECT ...) or
			CREATE  ... SELECT... without FOR UPDATE or
			IN SHARE MODE in select, then we use consistent
			read for select. */
6640 6641 6642

			prebuilt->select_lock_type = LOCK_NONE;
			prebuilt->stored_select_lock_type = LOCK_NONE;
6643
		} else if (thd->lex->sql_command == SQLCOM_CHECKSUM) {
6644
			/* Use consistent read for checksum table */
6645 6646 6647

			prebuilt->select_lock_type = LOCK_NONE;
			prebuilt->stored_select_lock_type = LOCK_NONE;
6648 6649 6650 6651
		} else {
			prebuilt->select_lock_type = LOCK_S;
			prebuilt->stored_select_lock_type = LOCK_S;
		}
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6652

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	} else if (lock_type != TL_IGNORE) {

6655
		/* We set possible LOCK_X value in external_lock, not yet
6656
		here even if this would be SELECT ... FOR UPDATE */
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6657

6658
		prebuilt->select_lock_type = LOCK_NONE;
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		prebuilt->stored_select_lock_type = LOCK_NONE;
6660 6661 6662 6663
	}

	if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK) {

6664
		/* Starting from 5.0.7, we weaken also the table locks
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		set at the start of a MySQL stored procedure call, just like
		we weaken the locks set at the start of an SQL statement.
		MySQL does set thd->in_lock_tables TRUE there, but in reality
		we do not need table locks to make the execution of a
		single transaction stored procedure call deterministic
		(if it does not use a consistent read). */

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		if (lock_type == TL_READ
		    && thd->lex->sql_command == SQLCOM_LOCK_TABLES) {
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			/* We come here if MySQL is processing LOCK TABLES
			... READ LOCAL. MyISAM under that table lock type
			reads the table as it was at the time the lock was
			granted (new inserts are allowed, but not seen by the
			reader). To get a similar effect on an InnoDB table,
			we must use LOCK TABLES ... READ. We convert the lock
			type here, so that for InnoDB, READ LOCAL is
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			equivalent to READ. This will change the InnoDB
			behavior in mysqldump, so that dumps of InnoDB tables
			are consistent with dumps of MyISAM tables. */
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			lock_type = TL_READ_NO_INSERT;
		}

6688
		/* If we are not doing a LOCK TABLE, DISCARD/IMPORT
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6689
		TABLESPACE or TRUNCATE TABLE then allow multiple
6690 6691
		writers. Note that ALTER TABLE uses a TL_WRITE_ALLOW_READ
		< TL_WRITE_CONCURRENT_INSERT.
6692

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		We especially allow multiple writers if MySQL is at the
		start of a stored procedure call (SQLCOM_CALL) or a
		stored function call (MySQL does have thd->in_lock_tables
		TRUE there). */
6697

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6698
    		if ((lock_type >= TL_WRITE_CONCURRENT_INSERT
6699
		    && lock_type <= TL_WRITE)
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		    && !(thd->in_lock_tables
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			    && thd->lex->sql_command == SQLCOM_LOCK_TABLES)
6702
		    && !thd->tablespace_op
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		    && thd->lex->sql_command != SQLCOM_TRUNCATE
6704 6705
		    && thd->lex->sql_command != SQLCOM_OPTIMIZE
		    && thd->lex->sql_command != SQLCOM_CREATE_TABLE) {
6706

6707
			lock_type = TL_WRITE_ALLOW_WRITE;
6708 6709
      		}

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		/* In queries of type INSERT INTO t1 SELECT ... FROM t2 ...
		MySQL would use the lock TL_READ_NO_INSERT on t2, and that
		would conflict with TL_WRITE_ALLOW_WRITE, blocking all inserts
		to t2. Convert the lock to a normal read lock to allow
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6714
		concurrent inserts to t2.
6715

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		We especially allow concurrent inserts if MySQL is at the
		start of a stored procedure call (SQLCOM_CALL)
6718
		(MySQL does have thd->in_lock_tables TRUE there). */
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6719

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		if (lock_type == TL_READ_NO_INSERT
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		    && thd->lex->sql_command != SQLCOM_LOCK_TABLES) {
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6722

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			lock_type = TL_READ;
		}
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6725

6726 6727
		lock.type = lock_type;
	}
6728

6729
	*to++= &lock;
6730

6731 6732 6733
	return(to);
}

6734
/***********************************************************************
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This function initializes the auto-inc counter if it has not been
initialized yet. This function does not change the value of the auto-inc
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counter if it already has been initialized. In parameter ret returns
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6738
the value of the auto-inc counter. */
6739

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int
ha_innobase::innobase_read_and_init_auto_inc(
/*=========================================*/
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				/* out: 0 or error code: deadlock or lock wait
				timeout */
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	longlong*	ret)	/* out: auto-inc value */
6746
{
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  	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
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    	longlong        auto_inc;
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	ulint		old_select_lock_type;
	ibool		trx_was_not_started	= FALSE;
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  	int     	error;
6752

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  	ut_a(prebuilt);
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	ut_a(prebuilt->trx ==
6755
                (trx_t*) current_thd->ha_data[innobase_hton.slot]);
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	ut_a(prebuilt->table);
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6757

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	if (prebuilt->trx->conc_state == TRX_NOT_STARTED) {
		trx_was_not_started = TRUE;
	}

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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);

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	auto_inc = dict_table_autoinc_read(prebuilt->table);
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	if (auto_inc != 0) {
		/* Already initialized */
		*ret = auto_inc;
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		error = 0;

		goto func_exit_early;
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	}
6777

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	error = row_lock_table_autoinc_for_mysql(prebuilt);
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	if (error != DB_SUCCESS) {
		error = convert_error_code_to_mysql(error, user_thd);
6782

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		goto func_exit_early;
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	}
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	/* Check again if someone has initialized the counter meanwhile */
	auto_inc = dict_table_autoinc_read(prebuilt->table);
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	if (auto_inc != 0) {
		*ret = auto_inc;
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		error = 0;

		goto func_exit_early;
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	}
6796

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  	(void) extra(HA_EXTRA_KEYREAD);
6798
  	index_init(table->s->next_number_index);
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	/* Starting from 5.0.9, we use a consistent read to read the auto-inc
	column maximum value. This eliminates the spurious deadlocks caused
	by the row X-lock that we previously used. Note the following flaw
	in our algorithm: if some other user meanwhile UPDATEs the auto-inc
	column, our consistent read will not return the largest value. We
	accept this flaw, since the deadlocks were a bigger trouble. */
6806

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  	/* Fetch all the columns in the key */
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6808

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	prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
6810

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	old_select_lock_type = prebuilt->select_lock_type;
  	prebuilt->select_lock_type = LOCK_NONE;

	/* Eliminate an InnoDB error print that happens when we try to SELECT
	from a table when no table has been locked in ::external_lock(). */
	prebuilt->trx->n_mysql_tables_in_use++;

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	error = index_last(table->record[1]);
6819

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	prebuilt->trx->n_mysql_tables_in_use--;
  	prebuilt->select_lock_type = old_select_lock_type;

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  	if (error) {
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		if (error == HA_ERR_END_OF_FILE) {
			/* The table was empty, initialize to 1 */
			auto_inc = 1;

			error = 0;
		} else {
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			/* This should not happen in a consistent read */
6831 6832
		  sql_print_error("Consistent read of auto-inc column "
				  "returned %lu", (ulong) error);
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  			auto_inc = -1;

  			goto func_exit;
  		}
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  	} else {
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		/* Initialize to max(col) + 1; we use
		'found_next_number_field' below because MySQL in SHOW TABLE
		STATUS does not seem to set 'next_number_field'. The comment
		in table.h says that 'next_number_field' is set when it is
		'active'. */

    		auto_inc = (longlong) table->found_next_number_field->
6845
                        	val_int_offset(table->s->rec_buff_length) + 1;
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  	}
6847

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	dict_table_autoinc_initialize(prebuilt->table, auto_inc);

func_exit:
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  	(void) extra(HA_EXTRA_NO_KEYREAD);
6852

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	index_end();

	*ret = auto_inc;

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func_exit_early:
	/* Since MySQL does not seem to call autocommit after SHOW TABLE
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	STATUS (even if we would register the trx here), we commit our
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	transaction here if it was started here. This is to eliminate a
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	dangling transaction. If the user had AUTOCOMMIT=0, then SHOW
	TABLE STATUS does leave a dangling transaction if the user does not
	himself call COMMIT. */
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	if (trx_was_not_started) {

		innobase_commit_low(prebuilt->trx);
	}

 	return(error);
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}

/***********************************************************************
This function initializes the auto-inc counter if it has not been
initialized yet. This function does not change the value of the auto-inc
counter if it already has been initialized. Returns the value of the
auto-inc counter. */

6879
ulonglong
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ha_innobase::get_auto_increment()
/*=============================*/
                         /* out: auto-increment column value, -1 if error
                         (deadlock or lock wait timeout) */
{
  	longlong        nr;
  	int     	error;
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	error = innobase_read_and_init_auto_inc(&nr);

	if (error) {
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		/* This should never happen in the current (5.0.6) code, since
		we call this function only after the counter has been
		initialized. */
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		ut_print_timestamp(stderr);
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		sql_print_error("Error %lu in ::get_auto_increment()",
				(ulong) error);
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          	return(~(ulonglong) 0);
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	}
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	return((ulonglong) nr);
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}

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/* See comment in handler.h */
int
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ha_innobase::reset_auto_increment(ulonglong value)
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{
	DBUG_ENTER("ha_innobase::reset_auto_increment");

	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
  	int     	error;

	error = row_lock_table_autoinc_for_mysql(prebuilt);

	if (error != DB_SUCCESS) {
		error = convert_error_code_to_mysql(error, user_thd);

		DBUG_RETURN(error);
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	}
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	dict_table_autoinc_initialize(prebuilt->table, value);
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	DBUG_RETURN(0);
}

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/* See comment in handler.cc */
bool
ha_innobase::get_error_message(int error, String *buf)
{
	trx_t*	    trx = check_trx_exists(current_thd);

	buf->copy(trx->detailed_error, strlen(trx->detailed_error),
		system_charset_info);

	return FALSE;
}

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/***********************************************************************
Compares two 'refs'. A 'ref' is the (internal) primary key value of the row.
If there is no explicitly declared non-null unique key or a primary key, then
InnoDB internally uses the row id as the primary key. */
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int
ha_innobase::cmp_ref(
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/*=================*/
				/* out: < 0 if ref1 < ref2, 0 if equal, else
				> 0 */
	const mysql_byte* ref1,	/* in: an (internal) primary key value in the
				MySQL key value format */
	const mysql_byte* ref2)	/* in: an (internal) primary key value in the
				MySQL key value format */
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{
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	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
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	enum_field_types mysql_type;
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	Field*		field;
	KEY_PART_INFO*	key_part;
	KEY_PART_INFO*	key_part_end;
	uint		len1;
	uint		len2;
	int 		result;

	if (prebuilt->clust_index_was_generated) {
		/* The 'ref' is an InnoDB row id */

		return(memcmp(ref1, ref2, DATA_ROW_ID_LEN));
	}

	/* Do a type-aware comparison of primary key fields. PK fields
	are always NOT NULL, so no checks for NULL are performed. */

	key_part = table->key_info[table->s->primary_key].key_part;

	key_part_end = key_part
			+ table->key_info[table->s->primary_key].key_parts;

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	for (; key_part != key_part_end; ++key_part) {
		field = key_part->field;
		mysql_type = field->type();
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		if (mysql_type == FIELD_TYPE_TINY_BLOB
		    || mysql_type == FIELD_TYPE_MEDIUM_BLOB
		    || mysql_type == FIELD_TYPE_BLOB
		    || mysql_type == FIELD_TYPE_LONG_BLOB) {
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			/* In the MySQL key value format, a column prefix of
			a BLOB is preceded by a 2-byte length field */

			len1 = innobase_read_from_2_little_endian(ref1);
			len2 = innobase_read_from_2_little_endian(ref2);

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			ref1 += 2;
			ref2 += 2;
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			result = ((Field_blob*)field)->cmp(
						    (const char*)ref1, len1,
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			                            (const char*)ref2, len2);
		} else {
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			result = field->key_cmp(ref1, ref2);
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		}

		if (result) {

			return(result);
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		}

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		ref1 += key_part->store_length;
		ref2 += key_part->store_length;
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	}
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	return(0);
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}

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char*
ha_innobase::get_mysql_bin_log_name()
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{
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	return(trx_sys_mysql_bin_log_name);
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}

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ulonglong
ha_innobase::get_mysql_bin_log_pos()
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{
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  	/* trx... is ib_longlong, which is a typedef for a 64-bit integer
	(__int64 or longlong) so it's ok to cast it to ulonglong. */

  	return(trx_sys_mysql_bin_log_pos);
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}

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extern "C" {
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/**********************************************************************
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This function is used to find the storage length in bytes of the first n
characters for prefix indexes using a multibyte character set. The function
finds charset information and returns length of prefix_len characters in the
index field in bytes.

NOTE: the prototype of this function is copied to data0type.c! If you change
this function, you MUST change also data0type.c! */
7036

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ulint
innobase_get_at_most_n_mbchars(
/*===========================*/
				/* out: number of bytes occupied by the first
				n characters */
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	ulint charset_id,	/* in: character set id */
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	ulint prefix_len,	/* in: prefix length in bytes of the index
				(this has to be divided by mbmaxlen to get the
				number of CHARACTERS n in the prefix) */
	ulint data_len,         /* in: length of the string in bytes */
	const char* str)	/* in: character string */
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{
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	ulint char_length;	/* character length in bytes */
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	ulint n_chars;		/* number of characters in prefix */
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	CHARSET_INFO* charset;	/* charset used in the field */
7052

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	charset = get_charset((uint) charset_id, MYF(MY_WME));
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	ut_ad(charset);
	ut_ad(charset->mbmaxlen);
7057

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	/* Calculate how many characters at most the prefix index contains */
7059

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	n_chars = prefix_len / charset->mbmaxlen;
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	/* If the charset is multi-byte, then we must find the length of the
	first at most n chars in the string. If the string contains less
	characters than n, then we return the length to the end of the last
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	character. */
7066

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	if (charset->mbmaxlen > 1) {
		/* my_charpos() returns the byte length of the first n_chars
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		characters, or a value bigger than the length of str, if
		there were not enough full characters in str.

		Why does the code below work:
		Suppose that we are looking for n UTF-8 characters.

		1) If the string is long enough, then the prefix contains at
		least n complete UTF-8 characters + maybe some extra
		characters + an incomplete UTF-8 character. No problem in
		this case. The function returns the pointer to the
		end of the nth character.

		2) If the string is not long enough, then the string contains
		the complete value of a column, that is, only complete UTF-8
		characters, and we can store in the column prefix index the
		whole string. */
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		char_length = my_charpos(charset, str,
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						str + data_len, (int) n_chars);
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		if (char_length > data_len) {
			char_length = data_len;
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		}
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	} else {
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		if (data_len < prefix_len) {
			char_length = data_len;
		} else {
			char_length = prefix_len;
		}
7097
	}
7098

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	return(char_length);
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}
}

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extern "C" {
/**********************************************************************
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This function returns true if
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1) SQL-query in the current thread
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is either REPLACE or LOAD DATA INFILE REPLACE.
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2) SQL-query in the current thread
is INSERT ON DUPLICATE KEY UPDATE.

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NOTE that /mysql/innobase/row/row0ins.c must contain the
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prototype for this function ! */

ibool
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innobase_query_is_update(void)
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/*==========================*/
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{
	THD*	thd;
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	thd = (THD *)innobase_current_thd();
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	if (thd->lex->sql_command == SQLCOM_REPLACE ||
	    thd->lex->sql_command == SQLCOM_REPLACE_SELECT ||
	    (thd->lex->sql_command == SQLCOM_LOAD &&
	     thd->lex->duplicates == DUP_REPLACE)) {

		return(1);
7130
	}
7131

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	if (thd->lex->sql_command == SQLCOM_INSERT &&
	    thd->lex->duplicates  == DUP_UPDATE) {

		return(1);
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	}

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	return(0);
7139
}
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}

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/***********************************************************************
This function is used to prepare X/Open XA distributed transaction   */

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int
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innobase_xa_prepare(
/*================*/
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			/* out: 0 or error number */
	THD*	thd,	/* in: handle to the MySQL thread of the user
			whose XA transaction should be prepared */
	bool	all)	/* in: TRUE - commit transaction
			FALSE - the current SQL statement ended */
{
	int error = 0;
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        trx_t* trx = check_trx_exists(thd);

        if (thd->lex->sql_command != SQLCOM_XA_PREPARE) {

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                /* For ibbackup to work the order of transactions in binlog
                and InnoDB must be the same. Consider the situation

                  thread1> prepare; write to binlog; ...
                          <context switch>
                  thread2> prepare; write to binlog; commit
                  thread1>                           ... commit

                To ensure this will not happen we're taking the mutex on
                prepare, and releasing it on commit.

                Note: only do it for normal commits, done via ha_commit_trans.
                If 2pc protocol is executed by external transaction
                coordinator, it will be just a regular MySQL client
                executing XA PREPARE and XA COMMIT commands.
                In this case we cannot know how many minutes or hours
                will be between XA PREPARE and XA COMMIT, and we don't want
                to block for undefined period of time.
                */
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                pthread_mutex_lock(&prepare_commit_mutex);
                trx->active_trans = 2;
        }
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	if (!thd->variables.innodb_support_xa) {

		return(0);
	}

7187
        trx->xid=thd->transaction.xid_state.xid;
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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

	if (trx->active_trans == 0 && trx->conc_state != TRX_NOT_STARTED) {

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	  sql_print_error("trx->active_trans == 0, but trx->conc_state != "
			  "TRX_NOT_STARTED");
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	}

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	if (all
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
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                /* We were instructed to prepare the whole transaction, or
                this is an SQL statement end and autocommit is on */
7206

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                ut_ad(trx->active_trans);
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		error = (int) trx_prepare_for_mysql(trx);
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	} else {
	        /* We just mark the SQL statement ended and do not do a
		transaction prepare */

		if (trx->auto_inc_lock) {
			/* If we had reserved the auto-inc lock for some
			table in this SQL statement we release it now */
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			row_unlock_table_autoinc_for_mysql(trx);
		}
		/* Store the current undo_no of the transaction so that we
		know where to roll back if we have to roll back the next
		SQL statement */

		trx_mark_sql_stat_end(trx);
	}

	/* Tell the InnoDB server that there might be work for utility
	threads: */

	srv_active_wake_master_thread();

        return error;
}

/***********************************************************************
This function is used to recover X/Open XA distributed transactions   */

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int
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innobase_xa_recover(
/*================*/
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				/* out: number of prepared transactions
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				stored in xid_list */
	XID*    xid_list, 	/* in/out: prepared transactions */
	uint	len)		/* in: number of slots in xid_list */
{
	if (len == 0 || xid_list == NULL) {
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		return(0);
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	}

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	return(trx_recover_for_mysql(xid_list, len));
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}

/***********************************************************************
This function is used to commit one X/Open XA distributed transaction
which is in the prepared state */

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int
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innobase_commit_by_xid(
/*===================*/
7261
			/* out: 0 or error number */
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	XID*	xid)	/* in: X/Open XA transaction identification */
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{
	trx_t*	trx;

	trx = trx_get_trx_by_xid(xid);

	if (trx) {
		innobase_commit_low(trx);
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		return(XA_OK);
	} else {
		return(XAER_NOTA);
	}
}

/***********************************************************************
This function is used to rollback one X/Open XA distributed transaction
which is in the prepared state */

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int
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innobase_rollback_by_xid(
/*=====================*/
7284
			/* out: 0 or error number */
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	XID	*xid)	/* in: X/Open XA transaction identification */
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{
	trx_t*	trx;

	trx = trx_get_trx_by_xid(xid);

	if (trx) {
		return(innobase_rollback_trx(trx));
	} else {
		return(XAER_NOTA);
	}
}

7298
/***********************************************************************
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Create a consistent view for a cursor based on current transaction
which is created if the corresponding MySQL thread still lacks one.
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This consistent view is then used inside of MySQL when accessing records
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using a cursor. */
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void*
innobase_create_cursor_view(void)
/*=============================*/
			/* out: Pointer to cursor view or NULL */
{
	return(read_cursor_view_create_for_mysql(
					check_trx_exists(current_thd)));
}

/***********************************************************************
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Close the given consistent cursor view of a transaction and restore
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global read view to a transaction read view. Transaction is created if the
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corresponding MySQL thread still lacks one. */
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void
innobase_close_cursor_view(
/*=======================*/
	void*	curview)/* in: Consistent read view to be closed */
{
	read_cursor_view_close_for_mysql(check_trx_exists(current_thd),
						(cursor_view_t*) curview);
}

/***********************************************************************
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Set the given consistent cursor view to a transaction which is created
if the corresponding MySQL thread still lacks one. If the given
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consistent cursor view is NULL global read view of a transaction is
restored to a transaction read view. */
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void
innobase_set_cursor_view(
/*=====================*/
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	void*	curview)/* in: Consistent cursor view to be set */
7337
{
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	read_cursor_set_for_mysql(check_trx_exists(current_thd),
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						(cursor_view_t*) curview);
}

7342
#endif /* HAVE_INNOBASE_DB */