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/* Copyright (C) 2000 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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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/* This file defines the InnoDB handler: the interface between MySQL and
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InnoDB
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 4.1:
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  - Remove the flag innodb_active_trans from thd and replace it with a
    function call innodb_active_trans(thd), which looks at the InnoDB
    trx struct state field
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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 __GNUC__
#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_mutex;
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bool innodb_inited= 0;
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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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uint 	innobase_init_flags 	= 0;
ulong 	innobase_cache_size 	= 0;
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/* The default values for the following, type long, 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_file_size, innobase_log_buffer_size,
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     innobase_buffer_pool_awe_mem_mb,
     innobase_buffer_pool_size, innobase_additional_mem_pool_size,
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     innobase_file_io_threads, innobase_lock_wait_timeout,
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     innobase_thread_concurrency, innobase_force_recovery,
     innobase_open_files;
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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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uint	innobase_flush_log_at_trx_commit	= 1;
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my_bool innobase_log_archive			= FALSE;/* unused */
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my_bool	innobase_use_native_aio			= FALSE;
my_bool	innobase_fast_shutdown			= TRUE;
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my_bool innobase_very_fast_shutdown		= FALSE; /* this can be set to
							 1 just prior calling
							 innobase_end() */
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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_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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char*	innobase_home 	= NULL;

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char    innodb_dummy_stmt_trx_handle = 'D';

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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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/*********************************************************************
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},
  {"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 */
{
	if (srv_thread_concurrency >= 500) {

		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 */
{
	if (srv_thread_concurrency >= 500) {

		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(
/*===============================*/
        void*   innobase_tid)
{
        innobase_release_stat_resources((trx_t*)innobase_tid);
}

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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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 		/* 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_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) {

    		return(HA_ERR_KEY_NOT_FOUND);

  	} 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) {

    		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));
}

/*****************************************************************
Relases the mutex reserved by innobase_mysql_prepare_print_arbitrary_thd().
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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/*****************************************************************
Prints info of a THD object (== user session thread) to the
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standard output. NOTE that /mysql/innobase/trx/trx0trx.c must contain
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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 */
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        void*   input_thd)/* in: pointer to a MySQL THD object */
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{
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	const THD*	thd;
	const char*	s;
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	char		buf[301];
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        thd = (const THD*) input_thd;
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  	fprintf(f, "MySQL thread id %lu, query id %lu",
		thd->thread_id, thd->query_id);
	if (thd->host) {
		putc(' ', f);
		fputs(thd->host, f);
	}
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	if (thd->ip) {
		putc(' ', f);
		fputs(thd->ip, f);
	}
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  	if (thd->user) {
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		putc(' ', f);
		fputs(thd->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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		/* determine the length of the query string */
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		uint32 i, len;
		
		len = thd->query_length;

		if (len > 300) {
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			len = 300;	/* ADDITIONAL SAFETY: print at most
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					300 chars to reduce the probability of
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					a seg fault if there is a race in
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					thd->query_length in MySQL; after
					May 14, 2004 probably no race any more,
					but better be safe */
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		}
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                /* Use strmake to reduce the timeframe
                   for a race, compared to fwrite() */
		i= (uint) (strmake(buf, s, len) - buf);
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		putc('\n', f);
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		fwrite(buf, 1, i, f);
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	}
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	putc('\n', f);
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}

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/**********************************************************************
Determines whether the given character set is of variable length.

NOTE that the exact prototype of this function has to be in
/innobase/data/data0type.ic! */
extern "C"
ibool
innobase_is_mb_cset(
/*================*/
	ulint	cset)	/* in: MySQL charset-collation code */
{
	CHARSET_INFO*	cs;
	ut_ad(cset < 256);

	cs = all_charsets[cset];

	return(cs && cs->mbminlen != cs->mbmaxlen);
}

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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, NullS, "ib",
#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->transaction.all.innobase_tid;
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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);
		
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		thd->transaction.all.innobase_tid = trx;
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		/* The execution of a single SQL statement is denoted by
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		a 'transaction' handle which is a dummy pointer: InnoDB
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		remembers internally where the latest SQL statement
		started, and if error handling requires rolling back the
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		latest statement, InnoDB does a rollback to a savepoint. */
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		thd->transaction.stmt.innobase_tid =
		                  (void*)&innodb_dummy_stmt_trx_handle;
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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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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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/*   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
read view to it if there is no read view yet. */

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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 */
	uint	full_name_len)	/* in: length of the full name, i.e.
				len(dbname) + len(tablename) + 1 */
{
	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);
	}

	trx = (trx_t*) thd->transaction.all.innobase_tid;

	if (trx == NULL) {
		trx = check_trx_exists(thd);
	}

	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);
	}
	
	/* 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 */

	thd->transaction.all.innodb_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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{
	/* 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,
						name, namelen));
}

/**************************************************************************
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,
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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 */

	current_thd->transaction.all.innodb_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)
/*===============*/
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			/* out: TRUE if 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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  	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 -------------------------*/
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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,
						   MYF(MY_WME));

	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");
	  	DBUG_RETURN(TRUE);
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	}
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	/* -------------- Log files ---------------------------*/

	/* The default dir for log files is the datadir of MySQL */
	
	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) {
		fprintf(stderr,
		"InnoDB: syntax error in innodb_log_group_home_dir\n"
		"InnoDB: or a wrong number of mirrored log groups\n");
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		DBUG_RETURN(TRUE);
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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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	srv_flush_log_at_trx_commit = (ulint) innobase_flush_log_at_trx_commit;
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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 */
 
                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;
 
                /* 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_thread_concurrency = (ulint) innobase_thread_concurrency;
	srv_force_recovery = (ulint) innobase_force_recovery;

	srv_fast_shutdown = (ibool) innobase_fast_shutdown;
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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
	installation */
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	data_mysql_default_charset_coll = (ulint)default_charset_info->number;
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	data_mysql_latin1_swedish_charset_coll =
					(ulint)my_charset_latin1.number;

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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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		DBUG_RETURN(1);
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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);
	pthread_mutex_init(&innobase_mutex, MY_MUTEX_INIT_FAST);
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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. */
	
/*	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(0);
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}

/***********************************************************************
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Closes an InnoDB database. */
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bool
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innobase_end(void)
/*==============*/
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				/* out: TRUE if error */
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{
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	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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	  if (innobase_very_fast_shutdown) {
	    srv_very_fast_shutdown = TRUE;
	    fprintf(stderr,
"InnoDB: MySQL has requested a very fast shutdown without flushing\n"
"InnoDB: the InnoDB buffer pool to data files. At the next mysqld startup\n"
"InnoDB: InnoDB will do a crash recovery!\n");

	  }

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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));
	  pthread_mutex_destroy(&innobase_mutex);
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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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bool
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innobase_flush_logs(void)
/*=====================*/
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				/* out: TRUE if error */
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{
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  	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. */
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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
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        if (current_thd->slave_thread) {
                /* 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 */

	current_thd->transaction.all.innodb_active_trans = 1;

	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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int
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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	void*	trx_handle)/* in: InnoDB trx handle or
			&innodb_dummy_stmt_trx_handle: the latter means
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			that the current SQL statement ended */
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{
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	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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	/* 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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	/* The flag thd->transaction.all.innodb_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(),
	6. innobase_start_trx_and_assign_read_view()
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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 (thd->transaction.all.innodb_active_trans == 0
	    && trx->conc_state != TRX_NOT_STARTED) {
	    
	        fprintf(stderr,
"InnoDB: Error: thd->transaction.all.innodb_active_trans == 0\n"
"InnoDB: but trx->conc_state != TRX_NOT_STARTED\n");
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	}
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	if (trx_handle != (void*)&innodb_dummy_stmt_trx_handle
	    || (!(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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		innobase_commit_low(trx);
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		thd->transaction.all.innodb_active_trans = 0;
	} 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 */
		  	
			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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	}
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	/* Tell the InnoDB server that there might be work for utility
	threads: */
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	srv_active_wake_master_thread();

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	DBUG_RETURN(0);
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}

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

  	innobase_commit(thd, trx_handle);

	trx->flush_log_later = FALSE;

	return(0);
}

/*********************************************************************
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 */
        void*   trx_handle)     /* in: InnoDB trx handle */
{
	trx_t*	trx;

	if (srv_flush_log_at_trx_commit == 0) {

	        return(0);
	}

	trx = (trx_t*)trx_handle;

	ut_a(trx != NULL);

  	trx_commit_complete_for_mysql(trx);

	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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int
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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	void*	trx_handle)/* in: InnoDB trx handle or a dummy stmt handle;
			the latter means we roll back the latest SQL
			statement */
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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"));

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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);

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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 (trx_handle != (void*)&innodb_dummy_stmt_trx_handle
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
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		error = trx_rollback_for_mysql(trx);
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		thd->transaction.all.innodb_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 */
		
		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. */

int
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 */
	char*	savepoint_name,	/* in: savepoint name */
	my_off_t* binlog_cache_pos)/* out: position which corresponds to the
				savepoint in the binlog cache of this
				transaction, not defined if error */
{
	ib_longlong mysql_binlog_cache_pos;
	int	    error = 0;
	trx_t*	    trx;

	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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	error = trx_rollback_to_savepoint_for_mysql(trx, savepoint_name,
						&mysql_binlog_cache_pos);
	*binlog_cache_pos = (my_off_t)mysql_binlog_cache_pos;
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
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}

/*********************************************************************
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Sets a transaction savepoint. */

int
innobase_savepoint(
/*===============*/
				/* out: always 0, that is, always succeeds */
	THD*	thd,		/* in: handle to the MySQL thread */
	char*	savepoint_name,	/* in: savepoint name */
	my_off_t binlog_cache_pos)/* in: offset up to which the current
				transaction has cached log entries to its
				binlog cache, not defined if no transaction
				active, or we are in the autocommit state, or
				binlogging is not switched on */
{
	int	error = 0;
	trx_t*	trx;

	DBUG_ENTER("innobase_savepoint");

	if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
		/* In the autocommit state there is no sense to set a
		savepoint: we return immediate success */
	        DBUG_RETURN(0);
	}

	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);

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	/* Setting a savepoint starts a transaction inside InnoDB since
	it allocates resources for it (memory to store the savepoint name,
	for example) */

	thd->transaction.all.innodb_active_trans = 1;

	error = trx_savepoint_for_mysql(trx, savepoint_name,
					     (ib_longlong)binlog_cache_pos);

	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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/*********************************************************************
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Frees a possible InnoDB trx object associated with the current THD. */
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int
innobase_close_connection(
/*======================*/
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			/* out: 0 or error number */
	THD*	thd)	/* in: handle to the MySQL thread of the user
			whose transaction should be rolled back */
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{
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	trx_t*	trx;
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	trx = (trx_t*)thd->transaction.all.innobase_tid;
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	if (NULL != trx) {
	        innobase_rollback(thd, (void*)trx);
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		trx_free_for_mysql(trx);
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		thd->transaction.all.innobase_tid = NULL;
	}
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	return(0);
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}
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/*****************************************************************************
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** InnoDB database tables
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*****************************************************************************/

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

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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;
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	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
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}
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/*********************************************************************
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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 */
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{
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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);

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	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. */
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	upd_and_key_val_buff_len = table->reclength + table->max_key_length
1751
							+ 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)) {
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	  	free_share(share);
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	  	DBUG_RETURN(1);
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  	}

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	/* 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);
	        fprintf(stderr, "  InnoDB error:\n"
"Cannot find table %s from the internal data dictionary\n"
"of InnoDB though the .frm file for the table exists. Maybe you\n"
"have deleted and recreated InnoDB data files but have forgotten\n"
"to delete the corresponding .frm files of InnoDB tables, or you\n"
"have moved .frm files to another database?\n"
"Look from section 15.1 of http://www.innodb.com/ibman.html\n"
"how you can resolve the problem.\n",
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			  norm_name);
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	        free_share(share);
    		my_free((char*) upd_buff, MYF(0));
    		my_errno = ENOENT;
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    		DBUG_RETURN(1);
  	}

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 	if (ib_table->ibd_file_missing && !thd->tablespace_op) {
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	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"MySQL is trying to open 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"
"the MySQL datadir, or have you used DISCARD TABLESPACE?\n"
"Look from section 15.1 of http://www.innodb.com/ibman.html\n"
"how you can resolve the problem.\n",
			  norm_name);
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	        free_share(share);
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    		my_free((char*) upd_buff, MYF(0));
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    		my_errno = ENOENT;
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    		DBUG_RETURN(1);
  	}

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	innobase_prebuilt = row_create_prebuilt(ib_table);
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	((row_prebuilt_t*)innobase_prebuilt)->mysql_row_len = table->reclength;
1803

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	/* Looks like MySQL-3.23 sometimes has primary key number != 0 */

 	primary_key = table->primary_key;
	key_used_on_scan = primary_key;
1808

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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! */
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  	if (!row_table_got_default_clust_index(ib_table)) {
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	        if (primary_key >= MAX_KEY) {
	                fprintf(stderr,
		    "InnoDB: Error: table %s has a primary key in InnoDB\n"
		    "InnoDB: data dictionary, but not in MySQL!\n", name);
		}
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		((row_prebuilt_t*)innobase_prebuilt)
				->clust_index_was_generated = FALSE;
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 		/*
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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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		*/
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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) {
	                fprintf(stderr,
		    "InnoDB: Error: table %s has no primary key in InnoDB\n"
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		    "InnoDB: data dictionary, but has one in MySQL!\n"
		    "InnoDB: If you created the table with a MySQL\n"
                    "InnoDB: version < 3.23.54 and did not define a primary\n"
                    "InnoDB: key, but defined a unique key with all non-NULL\n"
                    "InnoDB: columns, then MySQL internally treats that key\n"
                    "InnoDB: as the primary key. You can fix this error by\n"
		    "InnoDB: dump + DROP + CREATE + reimport of the table.\n",
				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) {
	                fprintf(stderr,
"InnoDB: Warning: table %s key_used_on_scan is %lu even though there is no\n"
"InnoDB: primary key inside InnoDB.\n",
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				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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Closes a handle to an InnoDB table. */
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int
ha_innobase::close(void)
/*====================*/
				/* out: error number */
{
  	DBUG_ENTER("ha_innobase::close");

	row_prebuilt_free((row_prebuilt_t*) innobase_prebuilt);

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    	my_free((char*) 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;
}

/******************************************************************
Resets SQL NULL bits in a record to zero. */
inline
void
reset_null_bits(
/*============*/
	TABLE*	table,	/* in: MySQL table object */
	char*	record)	/* in: a row in MySQL format */
{
	bzero(record, table->null_bytes);
}

1980 1981
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(
1989
/*===============*/
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					/* out: 1, 0, -1, if a is greater,
					equal, less than b, respectively */
1992
	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;
2002
	enum_field_types	mysql_tp;
2003
	int                     ret;
2004

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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_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:
2018
        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) {
				fprintf(stderr,
"InnoDB: fatal error: InnoDB needs charset %lu for doing a comparison,\n"
"InnoDB: but MySQL cannot find that charset.\n", (ulong)charset_number);
				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,
2046
                                                 b, b_length, 0);
2047
		if (ret < 0) {
2048
		        return(-1);
2049
		} else if (ret > 0) {
2050
		        return(1);
2051
		} else {
2052
		        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. */
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inline
ulint
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get_innobase_type_from_mysql_type(
/*==============================*/
			/* out: DATA_BINARY, DATA_VARCHAR, ... */
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	Field*	field)	/* in: MySQL field */
{
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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 */
2074 2075

	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:
                case MYSQL_TYPE_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) {
2084
						return(DATA_VARCHAR);
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					} else {
						return(DATA_VARMYSQL);
2087
					}
2088
		case MYSQL_TYPE_STRING: if (field->binary()) {
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						return(DATA_FIXBINARY);
					} else if (strcmp(
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						   field->charset()->name,
						   "latin1_swedish_ci") == 0) {
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						return(DATA_CHAR);
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					} else {
						return(DATA_MYSQL);
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					}
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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:
		case FIELD_TYPE_ENUM:
		case FIELD_TYPE_SET:
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		case FIELD_TYPE_TIME:
		case FIELD_TYPE_TIMESTAMP:
					return(DATA_INT);
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		case FIELD_TYPE_FLOAT:
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					return(DATA_FLOAT);
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		case FIELD_TYPE_DOUBLE:
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					return(DATA_DOUBLE);
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		case FIELD_TYPE_DECIMAL:
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					return(DATA_DECIMAL);
		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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/***********************************************************************
2131
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;
	ulint		blob_len;
	byte*		blob_data;
	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
	value is the SQL NULL then these data bytes are set to 0. */	

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	/* We have to zero-fill the buffer so that MySQL is able to use a
	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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	bzero(buff, buff_len);
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  	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();

		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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2199
			ut_a(key_part->key_part_flag & HA_PART_KEY_SEG);
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		        if (is_null) {
				 buff += key_part->length + 2;
				 
				 continue;
			}
		    
		        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());

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			ut_a(get_field_offset(table, field)
						     == key_part->offset);
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			if (blob_len > key_part->length) {
			        blob_len = key_part->length;
			}

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

			ut_a(blob_len < 256);
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			*((byte*)buff) = (byte)blob_len;
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			buff += 2;

			memcpy(buff, blob_data, blob_len);

			buff += key_part->length;
		} else {
		        if (is_null) {
				 buff += key_part->length;
				 
				 continue;
			}
			memcpy(buff, record + key_part->offset,
							key_part->length);
			buff += key_part->length;
		}
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  	}

2240
	ut_a(buff <= buff_start + buff_len);
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	DBUG_RETURN((uint)(buff - buff_start));
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}

/******************************************************************
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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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static
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void
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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 */
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{
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	dict_index_t*	index;
	dict_index_t*	clust_index;
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	mysql_row_templ_t* templ;
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	Field*		field;
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	ulint		n_fields;
	ulint		n_requested_fields	= 0;
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	ibool		fetch_all_in_key	= FALSE;
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	ibool		fetch_primary_key_cols	= TRUE; /* The ROR code in
						opt_range.cc assumes that the
						primary key cols are always
						retrieved. Starting from
						MySQL-5.0.2, let us always
						fetch them, even though it
						wastes some CPU. */ 
2274
	ulint		i;
2275

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	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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	        templ_type = ROW_MYSQL_WHOLE_ROW;
	}

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	if (templ_type == ROW_MYSQL_REC_FIELDS) {
	     if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_ALL_COLS) {
2287

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		/* We know we must at least fetch all columns in the key, or
		all columns in the table */
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		if (prebuilt->read_just_key) {
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			/* MySQL has instructed us that it is enough to
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			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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			fetch_all_in_key = TRUE;
		} else {
			templ_type = ROW_MYSQL_WHOLE_ROW;
		}
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	    } else if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_PRIMARY_KEY) {
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		/* 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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		fetch_primary_key_cols = TRUE;
	    }
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	}

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	clust_index = dict_table_get_first_index_noninline(prebuilt->table);
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2317
	if (templ_type == ROW_MYSQL_REC_FIELDS) {
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		index = prebuilt->index;
2319 2320
	} else {
		index = clust_index;
2321
	}
2322

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	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 */
	}
2330

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	n_fields = (ulint)table->fields; /* number of columns */
2332 2333 2334 2335 2336 2337

	if (!prebuilt->mysql_template) {
		prebuilt->mysql_template = (mysql_row_templ_t*)
						mem_alloc_noninline(
					n_fields * sizeof(mysql_row_templ_t));
	}
2338

2339 2340
	prebuilt->template_type = templ_type;
	prebuilt->null_bitmap_len = table->null_bytes;
2341

2342 2343
	prebuilt->templ_contains_blob = FALSE;

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	/* Note that in InnoDB, i is the column number. MySQL calls columns
	'fields'. */
2346
	for (i = 0; i < n_fields; i++) {
2347
		templ = prebuilt->mysql_template + n_requested_fields;
2348 2349
		field = table->field[i];

2350 2351
                ibool index_contains_field=
                  dict_index_contains_col_or_prefix(index, i);
2352 2353 2354

		if (templ_type == ROW_MYSQL_REC_FIELDS && 
                    ((prebuilt->read_just_key && !index_contains_field) ||
2355 2356 2357 2358
		     (!(fetch_all_in_key && index_contains_field) &&
		      !(fetch_primary_key_cols &&
			dict_table_col_in_clustered_key(index->table, i)) &&
		      thd->query_id != field->query_id))) {
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2359 2360

			/* This field is not needed in the query, skip it */
2361 2362 2363 2364 2365

			goto skip_field;
		}

		n_requested_fields++;
2366

2367
		templ->col_no = i;
2368

2369 2370 2371
		if (index == clust_index) {
			templ->rec_field_no = (index->table->cols + i)
								->clust_pos;
2372
		} else {
2373 2374
			templ->rec_field_no = dict_index_get_nth_col_pos(
								index, i);
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		}

2377 2378 2379 2380 2381 2382 2383 2384
		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]);
2385

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			templ->mysql_null_bit_mask = (ulint) field->null_bit;
		} else {
			templ->mysql_null_bit_mask = 0;
		}
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		templ->mysql_col_offset = (ulint)
					get_field_offset(table, field);

2394 2395 2396
		templ->mysql_col_len = (ulint) field->pack_length();
		templ->type = get_innobase_type_from_mysql_type(field);
		templ->is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
2397

2398 2399
		if (templ->type == DATA_BLOB) {
			prebuilt->templ_contains_blob = TRUE;
2400
		}
2401 2402 2403
skip_field:
		;
	}
2404

2405
	prebuilt->n_template = n_requested_fields;
2406

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	if (index != clust_index && prebuilt->need_to_access_clustered) {
2408 2409 2410 2411
		/* 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;
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2413 2414 2415
			templ->rec_field_no =
			    (index->table->cols + templ->col_no)->clust_pos;
		}
2416
	}
2417 2418 2419
}

/************************************************************************
2420
Stores a row in an InnoDB database, to the table specified in this
2421 2422 2423 2424 2425
handle. */

int
ha_innobase::write_row(
/*===================*/
2426 2427
				/* out: error code */
	mysql_byte* 	record)	/* in: a row in MySQL format */
2428
{
2429
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
2430
  	int 		error;
2431
	longlong	auto_inc;
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	longlong	dummy;
2433 2434
	ibool           incremented_auto_inc_for_stat = FALSE;
	ibool           incremented_auto_inc_counter = FALSE;
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	ibool           auto_inc_used= FALSE;
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2436

2437
  	DBUG_ENTER("ha_innobase::write_row");
2438

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	if (prebuilt->trx !=
			(trx_t*) current_thd->transaction.all.innobase_tid) {
		fprintf(stderr,
"InnoDB: Error: the transaction object for the table handle is at\n"
2443 2444 2445 2446 2447 2448 2449 2450 2451
"InnoDB: %p, but for the current thread it is at %p\n",
			prebuilt->trx,
			current_thd->transaction.all.innobase_tid);
		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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			((byte*)(&(current_thd->transaction.all))) - 100, 200);
2453 2454
		putc('\n', stderr);
		ut_error;
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	}
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2457 2458
  	statistic_increment(current_thd->status_var.ha_write_count,
			    &LOCK_status);
2459

2460 2461
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
                table->timestamp_field->set_time();
2462

2463
	if (user_thd->lex->sql_command == SQLCOM_ALTER_TABLE
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	    && num_write_row >= 10000) {
2465 2466 2467 2468 2469 2470 2471 2472
		/* 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. */
2473

2474
		dict_table_t*	src_table;
2475 2476
		ibool		mode;

2477
		num_write_row = 0;
2478

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2479 2480
		/* Commit the transaction.  This will release the table
		locks, so they have to be acquired again. */
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		/* Altering an InnoDB table */
		/* Get the source table. */
		src_table = lock_get_src_table(
				prebuilt->trx, prebuilt->table, &mode);
		if (!src_table) {
		no_commit:
			/* 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. */

2501 2502 2503 2504 2505 2506
			/* Altering to InnoDB format */
			innobase_commit(user_thd, prebuilt->trx);
			/* Note that this transaction is still active. */
			user_thd->transaction.all.innodb_active_trans = 1;
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
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		} else {
			/* Ensure that there are no other table locks than
			LOCK_IX and LOCK_AUTO_INC on the destination table. */
			if (!lock_is_table_exclusive(prebuilt->table,
							prebuilt->trx)) {
2512 2513 2514 2515 2516 2517 2518 2519 2520
				goto no_commit;
			}

			/* Commit the transaction.  This will release the table
			locks, so they have to be acquired again. */
			innobase_commit(user_thd, prebuilt->trx);
			/* Note that this transaction is still active. */
			user_thd->transaction.all.innodb_active_trans = 1;
			/* Re-acquire the table lock on the source table. */
2521
			row_lock_table_for_mysql(prebuilt, src_table, mode);
2522 2523 2524
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
		}
2525 2526
	}

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	num_write_row++;

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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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2532 2533

		innobase_release_stat_resources(prebuilt->trx);
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2534 2535
	}

2536
  	if (table->next_number_field && record == table->record[0]) {
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2537 2538
		/* This is the case where the table has an
		auto-increment column */
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2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563

		/* 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;
		}

2564 2565 2566 2567 2568 2569
		/*
                  We must use the handler code to update the auto-increment
                  value to be sure that increment it correctly.
                */
    		update_auto_increment();
                auto_inc_used= 1;
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2570

2571
	}
2572

2573 2574 2575 2576
	if (prebuilt->mysql_template == NULL
			|| prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {
		/* Build the template used in converting quickly between
		the two database formats */
2577

2578 2579
		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}
2580

2581
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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2582

2583
	error = row_insert_for_mysql((byte*) record, prebuilt);
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2584

2585
	if (error == DB_SUCCESS && auto_inc_used) {
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2586

2587
        /* Fetch the value that was set in the autoincrement field */
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2588

2589 2590 2591
          auto_inc = table->next_number_field->val_int();

          if (auto_inc != 0) {
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			/* This call will calculate the max of the current
			value and the value supplied by the user and
			update the counter accordingly */
2595 2596 2597 2598 2599 2600 2601 2602

			/* 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. */

2603
            error = row_lock_table_autoinc_for_mysql(prebuilt);
2604

2605
            if (error != DB_SUCCESS) {
2606

2607 2608 2609 2610 2611 2612
              error = convert_error_code_to_mysql(error, user_thd);
              goto func_exit;
            }
            dict_table_autoinc_update(prebuilt->table, auto_inc);
          }
        }
2613

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2614
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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2615

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2616
	error = convert_error_code_to_mysql(error, user_thd);
2617

2618
	/* Tell InnoDB server that there might be work for
2619
	utility threads: */
2620
func_exit:
2621
	innobase_active_small();
2622 2623 2624 2625

  	DBUG_RETURN(error);
}

2626

2627
/******************************************************************
2628
Converts field data for storage in an InnoDB update vector. */
2629 2630 2631 2632 2633 2634 2635 2636 2637 2638
inline
mysql_byte*
innobase_convert_and_store_changed_col(
/*===================================*/
				/* out: pointer to the end of the converted
				data in the buffer */
	upd_field_t*	ufield,	/* in/out: field in the update vector */
	mysql_byte*	buf,	/* in: buffer we can use in conversion */
	mysql_byte*	data,	/* in: column data to store */
	ulint		len,	/* in: data len */
2639
	ulint		col_type,/* in: data type in InnoDB type numbers */
2640
	ulint		is_unsigned)/* in: != 0 if an unsigned integer type */
2641
{
2642 2643 2644 2645
	uint	i;

	if (len == UNIV_SQL_NULL) {
		data = NULL;
2646 2647 2648 2649 2650 2651
        } else if (col_type == DATA_VARCHAR || col_type == DATA_BINARY
                   || col_type == DATA_VARMYSQL) {
                /* Remove trailing spaces */
                while (len > 0 && data[len - 1] == ' ') {
                        len--;
                }
2652
	} else if (col_type == DATA_INT) {
2653
		/* Store integer data in InnoDB in a big-endian
2654
		format, sign bit negated, if signed */
2655

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		for (i = 0; i < len; i++) {
			buf[len - 1 - i] = data[i];
		}

		if (!is_unsigned) {
			buf[0] = buf[0] ^ 128;
		}

		data = buf;

		buf += len;
2667
	}
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	ufield->new_val.data = data;
	ufield->new_val.len = len;

	return(buf);
}

/**************************************************************************
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 */
2688
	mysql_byte*	upd_buff,	/* in: buffer to use */
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	ulint		buff_len,	/* in: buffer length */
2690
	row_prebuilt_t*	prebuilt,	/* in: InnoDB prebuilt struct */
2691 2692
	THD*		thd)		/* in: user thread */
{
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2693
	mysql_byte*	original_upd_buff = upd_buff;
2694
	Field*		field;
2695 2696 2697
	uint		n_fields;
	ulint		o_len;
	ulint		n_len;
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	byte*	        o_ptr;
        byte*	        n_ptr;
        byte*	        buf;
2701
	upd_field_t*	ufield;
2702 2703
	ulint		col_type;
	ulint		is_unsigned;
2704
	ulint		n_changed = 0;
2705
	uint		i;
2706 2707 2708

	n_fields = table->fields;

2709
	/* We use upd_buff to convert changed fields */
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2710
	buf = (byte*) upd_buff;
2711

2712 2713 2714
	for (i = 0; i < n_fields; i++) {
		field = table->field[i];

2715
		/* if (thd->query_id != field->query_id) { */
2716 2717
			/* TODO: check that these fields cannot have
			changed! */
2718

2719 2720
		/*	goto skip_field;
		}*/
2721

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		o_ptr = (byte*) old_row + get_field_offset(table, field);
		n_ptr = (byte*) new_row + get_field_offset(table, field);
2724 2725 2726
		o_len = field->pack_length();
		n_len = field->pack_length();

2727
		col_type = get_innobase_type_from_mysql_type(field);
2728
		is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
2729 2730 2731 2732 2733 2734 2735 2736 2737 2738

		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);
			break;
		case DATA_VARCHAR:
		case DATA_BINARY:
		case DATA_VARMYSQL:
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			o_ptr = row_mysql_read_var_ref_noninline(&o_len,
								o_ptr);
			n_ptr = row_mysql_read_var_ref_noninline(&n_len,
								n_ptr);
2743 2744 2745
		default:
			;
		}
2746

2747
		if (field->null_ptr) {
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			if (field_in_record_is_null(table, field,
							(char*) old_row)) {
2750 2751
				o_len = UNIV_SQL_NULL;
			}
2752

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			if (field_in_record_is_null(table, field,
							(char*) new_row)) {
2755 2756 2757 2758 2759 2760 2761 2762 2763 2764
				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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			buf = (byte*)
                          innobase_convert_and_store_changed_col(ufield,
					  (mysql_byte*)buf,
					  (mysql_byte*)n_ptr, n_len, col_type,
2769
						is_unsigned);
2770
			ufield->exp = NULL;
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			ufield->field_no =
					(prebuilt->table->cols + i)->clust_pos;
2773 2774 2775 2776 2777 2778 2779
			n_changed++;
		}
	}

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

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

2782 2783 2784 2785 2786 2787 2788
	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.
2789
TODO: currently InnoDB does not prevent the 'Halloween problem':
2790 2791
in a searched update a single row can get updated several times
if its index columns are updated! */
2792

2793 2794 2795 2796
int
ha_innobase::update_row(
/*====================*/
					/* out: error number or 0 */
2797 2798
	const mysql_byte* 	old_row,/* in: old row in MySQL format */
	mysql_byte* 		new_row)/* in: new row in MySQL format */
2799 2800 2801 2802 2803
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	upd_t*		uvect;
	int		error = 0;

2804
	DBUG_ENTER("ha_innobase::update_row");
2805

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	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
                table->timestamp_field->set_time();
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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) */

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	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);
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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	error = row_update_for_mysql((byte*) old_row, prebuilt);
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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	error = convert_error_code_to_mysql(error, user_thd);
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	/* Tell InnoDB server that there might be work for
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	utility threads: */

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	innobase_active_small();
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	DBUG_RETURN(error);
}

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

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

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	DBUG_ENTER("ha_innobase::delete_row");
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	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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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) {
		row_get_prebuilt_update_vector(prebuilt);
	}
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	/* This is a delete */
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	prebuilt->upd_node->is_delete = TRUE;
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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	error = row_update_for_mysql((byte*) record, prebuilt);
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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	error = convert_error_code_to_mysql(error, user_thd);
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	/* Tell the InnoDB server that there might be work for
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	utility threads: */

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	innobase_active_small();
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	DBUG_RETURN(error);
}

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/**************************************************************************
Deletes a lock set to a row */

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

	DBUG_ENTER("ha_innobase::unlock_row");

	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);

	if (last_query_id != user_thd->query_id) {
		ut_print_timestamp(stderr);
		fprintf(stderr,
"  InnoDB: Error: last_query_id is %lu != user_thd_query_id is %lu\n",
			(ulong)last_query_id, (ulong)user_thd->query_id);
		mem_analyze_corruption((byte *) prebuilt->trx);
		ut_error;
	}

	row_unlock_for_mysql(prebuilt);
}

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/**********************************************************************
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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	error = change_active_index(keynr);
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  	DBUG_RETURN(error);
}

/**********************************************************************
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Currently does nothing. */
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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
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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. */

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		default:			assert(0);
	}

	return(0);
}
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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 */
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	mysql_byte*		buf,	/* in/out: buffer for the returned
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					row */
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	const mysql_byte* 	key_ptr,/* in: key value; if this is NULL
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					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 */
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	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 ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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  	statistic_increment(current_thd->status_var.ha_read_key_count,
			    &LOCK_status);
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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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	index = prebuilt->index;
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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 */
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	if (prebuilt->sql_stat_start) {
		build_template(prebuilt, user_thd, table,
							ROW_MYSQL_REC_FIELDS);
	}
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	if (key_ptr) {
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	        /* Convert the search key value to InnoDB format into
		prebuilt->search_tuple */

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		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,
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					(ulint) key_len, prebuilt->trx);
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	} else {
		/* We position the cursor to the last or the first entry
		in the index */

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

	last_match_mode = match_mode;

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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	ret = row_search_for_mysql((byte*) buf, mode, prebuilt, match_mode, 0);
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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	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(ret, user_thd);
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		table->status = STATUS_NOT_FOUND;
	}
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	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. */
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int
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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 */
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{
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        return(index_read(buf, key_ptr, key_len, HA_READ_PREFIX_LAST));
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}

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/************************************************************************
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Changes the active index of a handle. */
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int
ha_innobase::change_active_index(
/*=============================*/
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			/* out: 0 or error code */
	uint 	keynr)	/* in: use this index; MAX_KEY means always clustered
			index, even if it was internally generated by
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			InnoDB */
3184
{
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	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key=0;
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	statistic_increment(current_thd->status_var.ha_read_key_count,
			    &LOCK_status);
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	DBUG_ENTER("change_active_index");
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	ut_ad(user_thd == current_thd);
	ut_ad(prebuilt->trx ==
	     (trx_t*) current_thd->transaction.all.innobase_tid);
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	active_index = keynr;
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	if (keynr != MAX_KEY && table->keys > 0) {
		key = table->key_info + active_index;
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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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	}
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	if (!prebuilt->index) {
	       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);
	      DBUG_RETURN(1);
	}
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	assert(prebuilt->search_tuple != 0);
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	dtuple_set_n_fields(prebuilt->search_tuple, prebuilt->index->n_fields);
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	dict_index_copy_types(prebuilt->search_tuple, prebuilt->index,
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			prebuilt->index->n_fields);
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	/* 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. */
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	build_template(prebuilt, user_thd, table, ROW_MYSQL_REC_FIELDS);
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	DBUG_RETURN(0);
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}

/**************************************************************************
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 */
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	mysql_byte*	buf,		/* in/out: buffer for the returned
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					row */
	uint 		keynr,		/* in: use this index */
3245
	const mysql_byte* key,		/* in: key value; if this is NULL
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					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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	if (change_active_index(keynr)) {

		return(1);
	}
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	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 */
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	mysql_byte* 	buf,	/* in/out: buffer for next row in MySQL
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				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;
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3278
	DBUG_ENTER("general_fetch");
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	ut_ad(prebuilt->trx ==
	     (trx_t*) current_thd->transaction.all.innobase_tid);
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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	ret = row_search_for_mysql((byte*)buf, 0, prebuilt, match_mode,
								direction);
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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	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(ret, user_thd);
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		table->status = STATUS_NOT_FOUND;
	}
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	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 */
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	mysql_byte* 	buf)	/* in/out: buffer for next row in MySQL
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				format */
{
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  	statistic_increment(current_thd->status_var.ha_read_next_count,
			    &LOCK_status);
3322

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	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 */
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	mysql_byte* 	buf,	/* in/out: buffer for the row */
	const mysql_byte* key,	/* in: key value */
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	uint 		keylen)	/* in: key value length */
{
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  	statistic_increment(current_thd->status_var.ha_read_next_count,
			    &LOCK_status);
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	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 */
3353
	mysql_byte* 	buf)	/* in/out: buffer for previous row in MySQL
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				format */
{
	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(
/*=====================*/
3366
				/* out: 0, HA_ERR_END_OF_FILE,
3367 3368
				or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
3369 3370 3371 3372
{
	int	error;

  	DBUG_ENTER("index_first");
3373 3374
  	statistic_increment(current_thd->status_var.ha_read_first_count,
			    &LOCK_status);
3375 3376 3377

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

3378 3379 3380 3381 3382 3383
        /* 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;
  	}

3384 3385 3386 3387 3388 3389 3390 3391 3392 3393
  	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(
/*====================*/
3394 3395
				/* out: 0, HA_ERR_END_OF_FILE, or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
3396 3397 3398
{
	int	error;

3399
  	DBUG_ENTER("index_last");
3400 3401
  	statistic_increment(current_thd->status_var.ha_read_last_count,
			    &LOCK_status);
3402 3403 3404

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

3405
        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */
3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420

  	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 */
3421
	bool	scan)	/* in: ???????? */
3422
{
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	int	err;
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3425
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
3426

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

3430
	if (prebuilt->clust_index_was_generated) {
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		err = change_active_index(MAX_KEY);
3432
	} else {
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		err = change_active_index(primary_key);
3434
	}
3435

3436
  	start_of_scan = 1;
3437

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 	return(err);
3439 3440 3441
}

/*********************************************************************
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Ends a table scan. */
3443 3444 3445 3446 3447 3448

int
ha_innobase::rnd_end(void)
/*======================*/
				/* out: 0 or error number */
{
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	return(index_end());
3450 3451 3452 3453 3454 3455 3456 3457 3458 3459
}

/*********************************************************************
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 */
3460
	mysql_byte* buf)/* in/out: returns the row in this buffer,
3461 3462
			in MySQL format */
{
3463
	int	error;
3464 3465

  	DBUG_ENTER("rnd_next");
3466 3467
  	statistic_increment(current_thd->status_var.ha_read_rnd_next_count,
			    &LOCK_status);
3468

3469
  	if (start_of_scan) {
3470 3471 3472 3473
		error = index_first(buf);
		if (error == HA_ERR_KEY_NOT_FOUND) {
			error = HA_ERR_END_OF_FILE;
		}
3474
		start_of_scan = 0;
3475
	} else {
3476
		error = general_fetch(buf, ROW_SEL_NEXT, 0);
3477
	}
3478

3479 3480 3481 3482
  	DBUG_RETURN(error);
}

/**************************************************************************
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Fetches a row from the table based on a row reference. */
3484

3485 3486 3487
int
ha_innobase::rnd_pos(
/*=================*/
3488 3489 3490
				/* out: 0, HA_ERR_KEY_NOT_FOUND,
				or error code */
	mysql_byte* 	buf,	/* in/out: buffer for the row */
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	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 */
3496
{
3497 3498 3499
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error;
	uint		keynr	= active_index;
3500
	DBUG_ENTER("rnd_pos");
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	DBUG_DUMP("key", (char*) pos, ref_length);
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3503 3504
	statistic_increment(current_thd->status_var.ha_read_rnd_count,
			    &LOCK_status);
3505

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	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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3509 3510 3511 3512
	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 */
3514

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		error = change_active_index(MAX_KEY);
3516
	} else {
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		error = change_active_index(primary_key);
3518
	}
3519

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	if (error) {
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	        DBUG_PRINT("error",("Got error: %ld",error));
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		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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	if (error)
	{
	  DBUG_PRINT("error",("Got error: %ld",error));
	}
3533
	change_active_index(keynr);
3534

3535 3536 3537 3538
  	DBUG_RETURN(error);
}

/*************************************************************************
3539
Stores a reference to the current row to 'ref' field of the handle. Note
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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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is the current 'position' of the handle, because if row ref is actually
3543
the row id internally generated in InnoDB, then 'record' does not contain
3544 3545
it. We just guess that the row id must be for the record where the handle
was positioned the last time. */
3546 3547 3548 3549

void
ha_innobase::position(
/*==================*/
3550
	const mysql_byte*	record)	/* in: row in MySQL format */
3551
{
3552 3553
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	uint		len;
3554

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	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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3558 3559 3560 3561
	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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		that MySQL knows of */
3563 3564 3565 3566 3567

		len = DATA_ROW_ID_LEN;

		memcpy(ref, prebuilt->row_id, len);
	} else {
3568 3569
		len = store_key_val_for_row(primary_key, (char*)ref,
							 ref_length, record);
3570
	}
3571

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	/* Since we do not store len to the buffer 'ref', we must assume
	that len is always fixed for this table. The following assertion
	checks this. */
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	if (len != ref_length) {
	        fprintf(stderr,
	 "InnoDB: Error: stored ref len is %lu, but table ref len is %lu\n",
3579
		  (ulong)len, (ulong)ref_length);
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	}
3581 3582 3583
}

/*********************************************************************
3584
Creates a table definition to an InnoDB database. */
3585 3586 3587 3588
static
int
create_table_def(
/*=============*/
3589
	trx_t*		trx,		/* in: InnoDB transaction handle */
3590 3591
	TABLE*		form,		/* in: information on table
					columns and indexes */
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	const char*	table_name,	/* in: table name */
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	const char*	path_of_temp_table,/* in: if this is a table explicitly
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					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 */
3602 3603 3604 3605 3606 3607
{
	Field*		field;
	dict_table_t*	table;
	ulint		n_cols;
  	int 		error;
  	ulint		col_type;
3608 3609
  	ulint		nulls_allowed;
	ulint		unsigned_type;
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	ulint		binary_type;
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	ulint		charset_no;
3612
  	ulint		i;
3613

3614 3615 3616 3617 3618
  	DBUG_ENTER("create_table_def");
  	DBUG_PRINT("enter", ("table_name: %s", table_name));

	n_cols = form->fields;

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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 */
3621

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	table = dict_mem_table_create(table_name, 0, n_cols, comp);
3623

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	if (path_of_temp_table) {
		table->dir_path_of_temp_table =
			mem_heap_strdup(table->heap, path_of_temp_table);
	}

3629 3630 3631
	for (i = 0; i < n_cols; i++) {
		field = form->field[i];

3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643
		col_type = get_innobase_type_from_mysql_type(field);
		if (field->null_ptr) {
			nulls_allowed = 0;
		} else {
			nulls_allowed = DATA_NOT_NULL;
		}

		if (field->flags & UNSIGNED_FLAG) {
			unsigned_type = DATA_UNSIGNED;
		} else {
			unsigned_type = 0;
		}
3644

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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;	

		if (dtype_is_string_type(col_type)) {

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

			ut_a(charset_no < 256); /* in ut0type.h we assume that
						the number fits in one byte */
		}

3661
		dict_mem_table_add_col(table, (char*) field->field_name,
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					col_type, dtype_form_prtype( 
					(ulint)field->type()
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					| nulls_allowed | unsigned_type
3665
					| binary_type,
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					+ charset_no),
3667 3668 3669 3670 3671
					field->pack_length(), 0);
	}

	error = row_create_table_for_mysql(table, trx);

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	error = convert_error_code_to_mysql(error, NULL);
3673 3674 3675 3676 3677

	DBUG_RETURN(error);
}

/*********************************************************************
3678
Creates an index in an InnoDB database. */
3679 3680
static
int
3681 3682
create_index(
/*=========*/
3683
	trx_t*		trx,		/* in: InnoDB transaction handle */
3684 3685 3686 3687 3688
	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;
3690
	dict_index_t*	index;
3691
  	int 		error;
3692 3693 3694 3695
	ulint		n_fields;
	KEY*		key;
	KEY_PART_INFO*	key_part;
	ulint		ind_type;
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	ulint		col_type;
	ulint		prefix_len;
3698
  	ulint		i;
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  	ulint		j;
3700

3701
  	DBUG_ENTER("create_index");
3702

3703 3704 3705
	key = form->key_info + key_num;

    	n_fields = key->key_parts;
3706

3707 3708
    	ind_type = 0;

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    	if (key_num == form->primary_key) {
3710 3711
		ind_type = ind_type | DICT_CLUSTERED;
	}
3712

3713 3714 3715 3716
	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 */
3719 3720 3721 3722 3723 3724

	index = dict_mem_index_create((char*) table_name, key->name, 0,
						ind_type, n_fields);
	for (i = 0; i < n_fields; i++) {
		key_part = key->key_part + i;

3725
		/* (The flag HA_PART_KEY_SEG denotes in MySQL a column prefix
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3726 3727 3728 3729 3730 3731 3732 3733 3734 3735
		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. */
		
		field = NULL;
		for (j = 0; j < form->fields; j++) {

			field = form->field[j];

3736 3737 3738
			if (0 == innobase_strcasecmp(
					field->field_name,
					key_part->field->field_name)) {
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				/* Found the corresponding column */

				break;
			}
		}

		ut_a(j < form->fields);

		col_type = get_innobase_type_from_mysql_type(key_part->field);

		if (DATA_BLOB == col_type
		    || key_part->length < field->pack_length()) {

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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) {
			        fprintf(stderr,
"InnoDB: error: MySQL is trying to create a column prefix index field\n"
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3760 3761
"InnoDB: on an inappropriate data type. Table name %s, column name %s.\n",
				  table_name, key_part->field->field_name);
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			        prefix_len = 0;
			}
		} else {
		        prefix_len = 0;
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		}

3769 3770
		/* We assume all fields should be sorted in ascending
		order, hence the '0': */
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3772
		dict_mem_index_add_field(index,
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				(char*) key_part->field->field_name,
				0, prefix_len);
3775 3776 3777 3778
	}

	error = row_create_index_for_mysql(index, trx);

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	error = convert_error_code_to_mysql(error, NULL);
3780 3781 3782 3783 3784

	DBUG_RETURN(error);
}

/*********************************************************************
3785
Creates an index to an InnoDB table when the user has defined no
3786
primary index. */
3787 3788
static
int
3789 3790
create_clustered_index_when_no_primary(
/*===================================*/
3791
	trx_t*		trx,		/* in: InnoDB transaction handle */
3792 3793 3794
	const char*	table_name)	/* in: table name */
{
	dict_index_t*	index;
3795 3796
  	int 		error;

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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 */
3799

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	index = dict_mem_index_create((char*) table_name,
				      (char*) "GEN_CLUST_INDEX",
				      0, DICT_CLUSTERED, 0);
3803 3804
	error = row_create_index_for_mysql(index, trx);

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	error = convert_error_code_to_mysql(error, NULL);
3806

3807
	return(error);
3808 3809 3810
}

/*********************************************************************
3811
Creates a new table to an InnoDB database. */
3812 3813 3814 3815 3816 3817 3818 3819

int
ha_innobase::create(
/*================*/
					/* out: error number */
	const char*	name,		/* in: table name */
	TABLE*		form,		/* in: information on table
					columns and indexes */
3820 3821 3822
	HA_CREATE_INFO*	create_info)	/* in: more information of the
					created table, contains also the
					create statement string */
3823 3824 3825
{
	int		error;
	dict_table_t*	innobase_table;
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	trx_t*		parent_trx;
3827
	trx_t*		trx;
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	int		primary_key_no;
3829
	uint		i;
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	char		name2[FN_REFLEN];
	char		norm_name[FN_REFLEN];
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	THD		*thd= current_thd;
3833
	ib_longlong     auto_inc_value;
3834

3835 3836
  	DBUG_ENTER("ha_innobase::create");

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	DBUG_ASSERT(thd != NULL);
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	if (form->fields > 1000) {
		/* The limit probably should be REC_MAX_N_FIELDS - 3 = 1020,
		but we play safe here */

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	        DBUG_RETURN(HA_ERR_TO_BIG_ROW);
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	} 

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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 */

	trx_search_latch_release_if_reserved(parent_trx);	
	
3856
	trx = trx_allocate_for_mysql();
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	trx->mysql_thd = thd;
	trx->mysql_query_str = &((*thd).query);
3860

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

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

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	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}
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	fn_format(name2, name, "", "", 2);	// Remove the .frm extension
3876 3877

	normalize_table_name(norm_name, name2);
3878

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	/* Latch the InnoDB data dictionary exclusively so that no deadlocks
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	or lock waits can happen in it during a table create operation.
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	Drop table etc. do this latching in row0mysql.c. */
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	row_mysql_lock_data_dictionary(trx);
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	/* Create the table definition in InnoDB */
3886

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	error = create_table_def(trx, form, norm_name,
		create_info->options & HA_LEX_CREATE_TMP_TABLE ? name2 : NULL,
		!(form->db_options_in_use & HA_OPTION_PACK_RECORD));
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  	if (error) {
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		innobase_commit_low(trx);
3893

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		row_mysql_unlock_data_dictionary(trx);
3895 3896 3897 3898 3899 3900

  		trx_free_for_mysql(trx);

 		DBUG_RETURN(error);
 	}

3901 3902
	/* Look for a primary key */

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	primary_key_no= (table->primary_key != MAX_KEY ?
			 (int) table->primary_key : 
			 -1);
3906

3907 3908 3909
	/* Our function row_get_mysql_key_number_for_index assumes
	the primary key is always number 0, if it exists */

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	DBUG_ASSERT(primary_key_no == -1 || primary_key_no == 0);
3911

3912 3913
	/* Create the keys */

3914 3915 3916
	if (form->keys == 0 || primary_key_no == -1) {
		/* Create an index which is used as the clustered index;
		order the rows by their row id which is internally generated
3917
		by InnoDB */
3918

3919
		error = create_clustered_index_when_no_primary(trx,
3920
							norm_name);
3921
  		if (error) {
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			innobase_commit_low(trx);

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			row_mysql_unlock_data_dictionary(trx);
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			trx_free_for_mysql(trx);

			DBUG_RETURN(error);
      		}
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	}

	if (primary_key_no != -1) {
3933
		/* In InnoDB the clustered index must always be created
3934
		first */
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	    	if ((error = create_index(trx, form, norm_name,
					  (uint) primary_key_no))) {
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			innobase_commit_low(trx);

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			row_mysql_unlock_data_dictionary(trx);
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  			trx_free_for_mysql(trx);

			DBUG_RETURN(error);
      		}
      	}

	for (i = 0; i < form->keys; i++) {

		if (i != (uint) primary_key_no) {

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    			if ((error = create_index(trx, form, norm_name, i))) {
3952

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			  	innobase_commit_low(trx);
3954

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				row_mysql_unlock_data_dictionary(trx);
3956 3957 3958 3959 3960

  				trx_free_for_mysql(trx);

				DBUG_RETURN(error);
      			}
3961
      		}
3962
  	}
3963

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	if (current_thd->query != NULL) {
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		LEX_STRING q;
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		if (thd->convert_string(&q, system_charset_info,
					current_thd->query,
					current_thd->query_length,
					current_thd->charset())) {
			error = HA_ERR_OUT_OF_MEM;
		} else {
			error = row_table_add_foreign_constraints(trx,
					q.str, norm_name);

			error = convert_error_code_to_mysql(error, NULL);
		}
3978

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		if (error) {
			innobase_commit_low(trx);
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3982
			row_mysql_unlock_data_dictionary(trx);
3983

3984
  			trx_free_for_mysql(trx);
3985

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			DBUG_RETURN(error);
		}
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	}

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  	innobase_commit_low(trx);

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	row_mysql_unlock_data_dictionary(trx);
3993

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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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	innobase_table = dict_table_get(norm_name, NULL);
4001

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	DBUG_ASSERT(innobase_table != 0);
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	if (thd->lex->sql_command == SQLCOM_ALTER_TABLE &&
	   (thd->lex->create_info.used_fields & HA_CREATE_USED_AUTO) &&
	   (thd->lex->create_info.auto_increment_value != 0)) {

		/* Query was ALTER TABLE...AUTO_INC = x; Find out a table
		definition from the dictionary and get the current value
		of the auto increment field. Set a new value to the
		auto increment field if the new value is creater than 
		the current value. */

		auto_inc_value = thd->lex->create_info.auto_increment_value;
		dict_table_autoinc_initialize(innobase_table, auto_inc_value);
	}

4018
	/* Tell the InnoDB server that there might be work for
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	utility threads: */

	srv_active_wake_master_thread();

  	trx_free_for_mysql(trx);

	DBUG_RETURN(0);
}

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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;
4038
	dict_table_t*	dict_table;
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	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 ==
		(trx_t*) current_thd->transaction.all.innobase_tid);

4048
	dict_table = prebuilt->table;
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	trx = prebuilt->trx;

	if (discard) {
4052
		err = row_discard_tablespace_for_mysql(dict_table->name, trx);
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	} else {
4054
		err = row_import_tablespace_for_mysql(dict_table->name, trx);
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	}

	if (err == DB_SUCCESS) {
		DBUG_RETURN(0);
	}

	DBUG_RETURN(-1);
}

4064
/*********************************************************************
4065
Drops a table from an InnoDB database. Before calling this function,
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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
4068 4069
operation inside InnoDB will remove all locks any user has on the table
inside InnoDB. */
4070 4071 4072 4073

int
ha_innobase::delete_table(
/*======================*/
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				/* out: error number */
	const char*	name)	/* in: table name */
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{
	ulint	name_len;
	int	error;
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	trx_t*	parent_trx;
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	trx_t*	trx;
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	THD     *thd= current_thd;
4082
	char	norm_name[1000];
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 	DBUG_ENTER("ha_innobase::delete_table");
4085

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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 */

	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;
	}

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	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;
	}

4115 4116 4117
	name_len = strlen(name);

	assert(name_len < 1000);
4118

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	/* Strangely, MySQL passes the table name without the '.frm'
	extension, in contrast to ::create */
4121

4122 4123
	normalize_table_name(norm_name, name);

4124
  	/* Drop the table in InnoDB */
4125

4126
	error = row_drop_table_for_mysql(norm_name, trx,
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		thd->lex->sql_command == SQLCOM_DROP_DB);
4128

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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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4135
	/* Tell the InnoDB server that there might be work for
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	utility threads: */

	srv_active_wake_master_thread();

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  	innobase_commit_low(trx);
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4142 4143
  	trx_free_for_mysql(trx);

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	error = convert_error_code_to_mysql(error, NULL);
4145 4146 4147 4148

	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;
4166
	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 */

	trx_search_latch_release_if_reserved(parent_trx);	

4178
	ptr = strend(path) - 2;
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	while (ptr >= path && *ptr != '\\' && *ptr != '/') {
		ptr--;
		len++;
	}

	ptr++;
4186
	namebuf = my_malloc(len + 2, MYF(0));
4187 4188 4189 4190

	memcpy(namebuf, ptr, len);
	namebuf[len] = '/';
	namebuf[len + 1] = '\0';
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#ifdef  __WIN__
4192
	innobase_casedn_str(namebuf);
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#endif
4194
	trx = trx_allocate_for_mysql();
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	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4197

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

4202
  	error = row_drop_database_for_mysql(namebuf, trx);
4203
	my_free(namebuf, MYF(0));
4204

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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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	/* 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);
4220 4221 4222 4223

	return(error);
}

4224
/*************************************************************************
4225
Renames an InnoDB table. */
4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236

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;
4238
	trx_t*	trx;
4239 4240
	char	norm_from[1000];
	char	norm_to[1000];
4241

4242 4243
  	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 */

	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;
	}

4260
	trx = trx_allocate_for_mysql();
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	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4263 4264 4265 4266 4267 4268

	name_len1 = strlen(from);
	name_len2 = strlen(to);

	assert(name_len1 < 1000);
	assert(name_len2 < 1000);
4269

4270 4271 4272
	normalize_table_name(norm_from, from);
	normalize_table_name(norm_to, to);

4273
  	/* Rename the table in InnoDB */
4274

4275
  	error = row_rename_table_for_mysql(norm_from, norm_to, trx);
4276

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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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4283
	/* Tell the InnoDB server that there might be work for
4284 4285 4286 4287
	utility threads: */

	srv_active_wake_master_thread();

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  	innobase_commit_low(trx);
4289 4290
  	trx_free_for_mysql(trx);

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	error = convert_error_code_to_mysql(error, NULL);
4292 4293 4294 4295 4296 4297 4298 4299 4300 4301

	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 */
4309 4310 4311 4312
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key;
	dict_index_t*	index;
4313
	mysql_byte*	key_val_buff2 	= (mysql_byte*) my_malloc(
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						  table->reclength
      						+ table->max_key_length + 100,
4316
								MYF(MY_WME));
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	ulint		buff2_len = table->reclength
      						+ table->max_key_length + 100;
4319
	dtuple_t*	range_start;
4320
	dtuple_t*	range_end;
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	ib_longlong	n_rows;
4322 4323
	ulint		mode1;
	ulint		mode2;
4324 4325
	void*           heap1;
	void*           heap2;
4326

4327
   	DBUG_ENTER("records_in_range");
4328

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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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4336 4337 4338
	active_index = keynr;

	key = table->key_info + active_index;
4339

4340
	index = dict_table_get_index_noninline(prebuilt->table, key->name);
4341

4342
	range_start = dtuple_create_for_mysql(&heap1, key->key_parts);
4343
 	dict_index_copy_types(range_start, index, key->key_parts);
4344

4345
	range_end = dtuple_create_for_mysql(&heap2, key->key_parts);
4346
 	dict_index_copy_types(range_end, index, key->key_parts);
4347

4348
	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),
4354 4355
				(ulint) (min_key ? min_key->length : 0),
				prebuilt->trx);
4356

4357
	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),
4362 4363
				(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);
4369

4370
	n_rows = btr_estimate_n_rows_in_range(index, range_start,
4371
						mode1, range_end, mode2);
4372 4373
	dtuple_free_for_mysql(heap1);
	dtuple_free_for_mysql(heap2);
4374

4375 4376
    	my_free((char*) key_val_buff2, MYF(0));

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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;
	}

4389 4390 4391
	DBUG_RETURN((ha_rows) n_rows);
}

4392 4393
/*************************************************************************
Gives an UPPER BOUND to the number of rows in a table. This is used in
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filesort.cc. */
4395 4396

ha_rows
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ha_innobase::estimate_rows_upper_bound(void)
4398
/*======================================*/
4399
			/* out: upper bound of rows */
4400 4401
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
4402 4403
	dict_index_t*	index;
	ulonglong	estimate;
4404
	ulonglong	local_data_file_length;
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 	DBUG_ENTER("estimate_rows_upper_bound");
4407

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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);
4421

4422
	index = dict_table_get_first_index_noninline(prebuilt->table);
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4424
	local_data_file_length = ((ulonglong) index->stat_n_leaf_pages)
4425
    							* UNIV_PAGE_SIZE;
4426

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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);
4438 4439
}

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/*************************************************************************
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. */
	
	return((double) (prebuilt->table->stat_clustered_index_size));
4458 4459
}

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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;
  
	if (index != table->primary_key)
	  return handler::read_time(index, ranges, rows); // Not clustered

	if (rows <= 2)
	  return (double) rows;

	/* 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;

	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. */

void
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;
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	ha_rows		rec_per_key;
4505 4506
	ulong		j;
	ulong		i;
4507 4508
	char		path[FN_REFLEN];
	os_file_stat_t  stat_info;
4509

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 	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) {

4518
                DBUG_VOID_RETURN;
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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";

4542
 		dict_update_statistics(ib_table);
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		prebuilt->trx->op_info = (char*)
		                          "returning various info to MySQL";
4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559

		if (ib_table->space != 0) {
			my_snprintf(path, sizeof(path), "%s/%s%s",
				    mysql_data_home, ib_table->name,
				    ".ibd");
			unpack_filename(path,path);
		} else {
			my_snprintf(path, sizeof(path), "%s/%s%s", 
				    mysql_data_home, ib_table->name,
				    reg_ext);
		
			unpack_filename(path,path);
		}

4560 4561 4562
		/* Note that we do not know the access time of the table, 
		nor the CHECK TABLE time, nor the UPDATE or INSERT time. */

4563 4564 4565
		if (os_file_get_status(path,&stat_info)) {
			create_time = stat_info.ctime;
		}
4566 4567 4568
 	}

	if (flag & HA_STATUS_VARIABLE) {
4569
    		records = (ha_rows)ib_table->stat_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 {
4583
    			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);
		}
4593

4594
		for (i = 0; i < table->keys; i++) {
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			if (index == NULL) {
				ut_print_timestamp(stderr);
			        fprintf(stderr,
"  InnoDB: Error: table %s contains less indexes inside InnoDB\n"
"InnoDB: than are defined in the MySQL .frm file. Have you mixed up\n"
"InnoDB: .frm files from different installations? See section\n"
"InnoDB: 15.1 at http://www.innodb.com/ibman.html\n",
				   ib_table->name);
				break;
			}

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			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);
			                fprintf(stderr,
"  InnoDB: Error: index %s of %s has %lu columns unique inside InnoDB\n"
"InnoDB: but MySQL is asking statistics for %lu columns. Have you mixed up\n"
"InnoDB: .frm files from different installations? See section\n"
"InnoDB: 15.1 at http://www.innodb.com/ibman.html\n",
						index->name,
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						ib_table->name,
						(unsigned long) index->n_uniq,
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						j + 1);
				        break;
				}

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				if (index->stat_n_diff_key_vals[j + 1] == 0) {

					rec_per_key = records;
				} else {
4626
					rec_per_key = (ha_rows)(records /
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   				         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;

4637 4638 4639
				if (rec_per_key == 0) {
					rec_per_key = 1;
				}
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4641 4642 4643
 				table->key_info[i].rec_per_key[j]=
				  rec_per_key >= ~(ulong) 0 ? ~(ulong) 0 :
				  rec_per_key;
4644
			}
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4646
			index = dict_table_get_next_index_noninline(index);
4647 4648
		}
	}
4649 4650

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

4653
		errkey = (unsigned int) row_get_mysql_key_number_for_index(
4654 4655
				       (dict_index_t*)
				       trx_get_error_info(prebuilt->trx));
4656 4657
  	}

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

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  	DBUG_VOID_RETURN;
}

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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(
/*=================*/			 
					/* 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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/**************************************************************************
4681 4682
This is mapped to "ALTER TABLE tablename TYPE=InnoDB", which rebuilds
the table in MySQL. */
4683

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int
ha_innobase::optimize(
/*==================*/
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
4689
{
4690
        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 ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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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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/*****************************************************************
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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. */
4734 4735 4736 4737

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 */
4741
{
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	uint	length			= strlen(comment);
	char*				str;
	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
4745

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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. */

4750 4751 4752 4753
	if(length > 64000 - 3) {
		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);
4762
	str = NULL;
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	if (FILE* file = os_file_create_tmpfile()) {
4765
		long	flen;
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		/* output the data to a temporary file */
		fprintf(file, "InnoDB free: %lu kB",
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      		   (ulong) fsp_get_available_space_in_free_extents(
      					prebuilt->table->space));
4771

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		dict_print_info_on_foreign_keys(FALSE, file,
				prebuilt->trx, prebuilt->table);
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		flen = ftell(file);
		if(length + flen + 3 > 64000) {
			flen = 64000 - 3 - length;
		}
4778

4779
		ut_ad(flen > 0);
4780

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		/* allocate buffer for the full string, and
		read the contents of the temporary file */
4783

4784
		str = my_malloc(length + flen + 3, MYF(0));
4785

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		if (str) {
			char* pos	= str + length;
			if(length) {
				memcpy(str, comment, length);
				*pos++ = ';';
				*pos++ = ' ';
			}
			rewind(file);
			flen = fread(pos, 1, flen, file);
			pos[flen] = 0;
		}

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

4803
  	return(str ? str : (char*) comment);
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}

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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;
4817
	char*	str	= 0;
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	ut_a(prebuilt != NULL);
4820

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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);

4827
	if (FILE* file = os_file_create_tmpfile()) {
4828
		long	flen;
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4830
		prebuilt->trx->op_info = (char*)"getting info on foreign keys";
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4832 4833 4834
		/* In case MySQL calls this in the middle of a SELECT query,
		release possible adaptive hash latch to avoid
		deadlocks of threads */
4835

4836
		trx_search_latch_release_if_reserved(prebuilt->trx);
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4838
		/* output the data to a temporary file */
4839 4840
		dict_print_info_on_foreign_keys(TRUE, file,
				prebuilt->trx, prebuilt->table);
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		prebuilt->trx->op_info = (char*)"";

		flen = ftell(file);
		if(flen > 64000 - 1) {
			flen = 64000 - 1;
		}

		ut_ad(flen >= 0);

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

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

		if (str) {
			rewind(file);
			flen = fread(str, 1, flen, file);
			str[flen] = 0;
		}

		fclose(file);
	} else {
		/* unable to create temporary file */
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          	str = my_malloc(1, MYF(MY_ZEROFILL));
4865
	}
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  	return(str);
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}
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int 
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);
4882
  mutex_enter_noninline(&(dict_sys->mutex));
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  foreign = UT_LIST_GET_FIRST(prebuilt->table->foreign_list);

  while (foreign != NULL) 
  {
    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;
    f_key_info.forein_id= make_lex_string(thd, f_key_info.forein_id,
                                          tmp_buff, strlen(tmp_buff), 1);
    tmp_buff= foreign->referenced_table_name;
    i= 0;
    while (tmp_buff[i] != '/')
      i++;
    f_key_info.referenced_db= make_lex_string(thd, f_key_info.referenced_db,
                                              tmp_buff, i, 1);
    tmp_buff+= i + 1;
    f_key_info.referenced_table= make_lex_string(thd, 
                                                 f_key_info.referenced_table,
                                                 tmp_buff, strlen(tmp_buff), 1);

    for (i= 0;;)
    {
      tmp_buff= foreign->foreign_col_names[i];
      name= make_lex_string(thd, name, tmp_buff, strlen(tmp_buff), 1);
      f_key_info.foreign_fields.push_back(name);
      tmp_buff= foreign->referenced_col_names[i];
      name= make_lex_string(thd, name, tmp_buff, strlen(tmp_buff), 1);
      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";
    }	
    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);

    FOREIGN_KEY_INFO *pf_key_info= ((FOREIGN_KEY_INFO *) 
                                    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);
  }
4963
  mutex_exit_noninline(&(dict_sys->mutex));
4964 4965 4966 4967
  prebuilt->trx->op_info = (char*)"";
  DBUG_RETURN(0);
}

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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) {
4999
		my_free(str, MYF(0));
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	}
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}

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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);
                        }
5030
                        prebuilt->keep_other_fields_on_keyread = 0;
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                        prebuilt->read_just_key = 0;
                        break;
  		case HA_EXTRA_RESET_STATE:
5034
	        	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
on that table. */
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int
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ha_innobase::start_stmt(
/*====================*/
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	              /* out: 0 or error code */
	THD*    thd)  /* in: handle to the user thread */
{
	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);

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	if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
	    						&& trx->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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	auto_inc_counter_for_this_stat = 0;
	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 */
	  
	        prebuilt->select_lock_type = LOCK_X;
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	} else {
		if (trx->isolation_level != TRX_ISO_SERIALIZABLE
		    && thd->lex->sql_command == SQLCOM_SELECT
		    && thd->lex->lock_option == 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(),
			2) ::external_lock(), and
			3) ::init_table_handle_for_HANDLER(). */

			prebuilt->select_lock_type =
				prebuilt->stored_select_lock_type;
		}

		if (prebuilt->stored_select_lock_type != LOCK_S
		    && prebuilt->stored_select_lock_type != LOCK_X) {
			fprintf(stderr,
"InnoDB: Error: stored_select_lock_type is %lu inside ::start_stmt()!\n",
			prebuilt->stored_select_lock_type);

			/* Set the value to LOCK_X: this is just fault
			tolerance, we do not know what the correct value
			should be! */

			prebuilt->select_lock_type = LOCK_X;
		}
	}

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	/* Set the MySQL flag to mark that there is an active transaction */
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	thd->transaction.all.innodb_active_trans = 1;
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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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/**********************************************************************
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(
/*=======================*/
5184
			        /* 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);

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 	if (prebuilt->table->ibd_file_missing && !current_thd->tablespace_op) {
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	        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"
"the MySQL datadir, or have you used DISCARD TABLESPACE?\n"
"Look from section 15.1 of http://www.innodb.com/ibman.html\n"
"how you can resolve the problem.\n",
				prebuilt->table->name);
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		DBUG_RETURN(HA_ERR_CRASHED);
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	}

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	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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		/* Set the MySQL flag to mark that there is an active
		transaction */
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		thd->transaction.all.innodb_active_trans = 1;
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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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		}
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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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		if (prebuilt->select_lock_type != LOCK_NONE) {
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			if (thd->in_lock_tables &&
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			    thd->variables.innodb_table_locks) {
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				ulint	error;
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				error = row_lock_table_for_mysql(prebuilt,
							NULL, LOCK_TABLE_EXP);
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				if (error != DB_SUCCESS) {
					error = convert_error_code_to_mysql(
						error, user_thd);
					DBUG_RETURN(error);
				}
			}
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		  	trx->mysql_n_tables_locked++;
		}

5274
		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;
	auto_inc_counter_for_this_stat = 0;
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	if (trx->n_lock_table_exp) {
		row_unlock_tables_for_mysql(trx);
5284
	}
5285

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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 (thd->transaction.all.innodb_active_trans != 0) {
		    	        innobase_commit(thd, trx);
			}
		} else {
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			if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
	    						&& trx->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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		}
	}

5316
	DBUG_RETURN(0);
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}

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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;
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	trx_t*		trx;
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        DBUG_ENTER("innodb_show_status");

5344
        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);

5355
	/* We let the InnoDB Monitor to output at most 64000 bytes of text. */
5356

5357 5358
	long	flen;
	char*	str;
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5360
	mutex_enter_noninline(&srv_monitor_file_mutex);
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	rewind(srv_monitor_file);
	srv_printf_innodb_monitor(srv_monitor_file);
	flen = ftell(srv_monitor_file);
5364
	os_file_set_eof(srv_monitor_file);
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	if(flen > 64000 - 1) {
		flen = 64000 - 1;
	}
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5369
	ut_ad(flen > 0);
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	/* allocate buffer for the string, and
	read the contents of the temporary file */
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	if (!(str = my_malloc(flen + 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);
	flen = fread(str, 1, flen, srv_monitor_file);
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5383
	mutex_exit_noninline(&srv_monitor_file_mutex);
5384

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	List<Item> field_list;

5387
	field_list.push_back(new Item_empty_string("Status", flen));
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5389 5390
	if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS |
                                               Protocol::SEND_EOF)) {
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		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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/****************************************************************************
 Handling the shared INNOBASE_SHARE structure that is needed to provide table
 locking.
****************************************************************************/

5413
static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
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			      my_bool not_used __attribute__((unused)))
{
  *length=share->table_name_length;
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  return (mysql_byte*) share->table_name;
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}

static INNOBASE_SHARE *get_share(const char *table_name)
{
  INNOBASE_SHARE *share;
  pthread_mutex_lock(&innobase_mutex);
  uint length=(uint) strlen(table_name);
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  if (!(share=(INNOBASE_SHARE*) hash_search(&innobase_open_tables,
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					(mysql_byte*) table_name,
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					    length)))
  {
    if ((share=(INNOBASE_SHARE *) my_malloc(sizeof(*share)+length+1,
				       MYF(MY_WME | MY_ZEROFILL))))
    {
      share->table_name_length=length;
      share->table_name=(char*) (share+1);
      strmov(share->table_name,table_name);
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      if (my_hash_insert(&innobase_open_tables, (mysql_byte*) share))
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      {
	pthread_mutex_unlock(&innobase_mutex);
	my_free((gptr) share,0);
	return 0;
      }
      thr_lock_init(&share->lock);
5442
      pthread_mutex_init(&share->mutex,MY_MUTEX_INIT_FAST);
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    }
  }
  share->use_count++;
  pthread_mutex_unlock(&innobase_mutex);
  return share;
}

static void free_share(INNOBASE_SHARE *share)
{
  pthread_mutex_lock(&innobase_mutex);
  if (!--share->use_count)
  {
5455
    hash_delete(&innobase_open_tables, (mysql_byte*) share);
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    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((gptr) share, MYF(0));
  }
  pthread_mutex_unlock(&innobase_mutex);
}
5462 5463

/*********************************************************************
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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. */
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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
						'lock' */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;

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	if ((lock_type == TL_READ && thd->in_lock_tables) ||
	    (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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		/* The OR cases above are in this order:
		1) MySQL is doing LOCK TABLES ... READ LOCAL, or
		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
		MySQL is doing LOCK TABLES ... READ. */
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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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	} else if (lock_type != TL_IGNORE) {

	        /* In ha_berkeley.cc there is a comment that MySQL
	        may in exceptional cases call this with TL_IGNORE also
	        when it is NOT going to release the lock. */

	        /* We set possible LOCK_X value in external_lock, not yet
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		here even if this would be SELECT ... FOR UPDATE */
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5513
		prebuilt->select_lock_type = LOCK_NONE;
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		prebuilt->stored_select_lock_type = LOCK_NONE;
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	}

	if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK) {

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    		/* If we are not doing a LOCK TABLE or DISCARD/IMPORT
		TABLESPACE, then allow multiple writers */
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    		if ((lock_type >= TL_WRITE_CONCURRENT_INSERT &&
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	 	    lock_type <= TL_WRITE) && !thd->in_lock_tables
		    && !thd->tablespace_op) {
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      			lock_type = TL_WRITE_ALLOW_WRITE;
      		}

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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
		concurrent inserts to t2. */
      		
		if (lock_type == TL_READ_NO_INSERT && !thd->in_lock_tables) {
			lock_type = TL_READ;
		}
		
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 		lock.type=lock_type;
  	}

  	*to++= &lock;
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	return(to);
}

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/***********************************************************************
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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 paramete ret returns
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the value of the auto-inc counter. */
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int
ha_innobase::innobase_read_and_init_auto_inc(
/*=========================================*/
				/* out: 0 or error code: deadlock or
				lock wait timeout */
	longlong*	ret)	/* out: auto-inc value */
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{
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  	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
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    	longlong        auto_inc;
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  	int     	error;
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  	ut_a(prebuilt);
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	ut_a(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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	ut_a(prebuilt->table);
	
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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;
	
		return(0);
	}
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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);
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		goto func_exit;
	}	
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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;
	
		return(0);
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	}
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  	(void) extra(HA_EXTRA_KEYREAD);
  	index_init(table->next_number_index);

	/* We use an exclusive lock when we read the max key value from the
  	auto-increment column index. This is because then build_template will
  	advise InnoDB to fetch all columns. In SHOW TABLE STATUS the query
  	id of the auto-increment column is not changed, and previously InnoDB
  	did not fetch it, causing SHOW TABLE STATUS to show wrong values
  	for the autoinc column. */
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  	prebuilt->select_lock_type = LOCK_X;
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  	/* Play safe and also give in another way the hint to fetch
  	all columns in the key: */
  	
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	prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
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	prebuilt->trx->mysql_n_tables_locked += 1;
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	error = index_last(table->record[1]);
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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 {
			/* Deadlock or a lock wait timeout */
  			auto_inc = -1;

  			goto func_exit;
  		}
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  	} else {
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		/* Initialize to max(col) + 1 */
    		auto_inc = (longlong) table->next_number_field->
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                        	val_int_offset(table->rec_buff_length) + 1;
  	}
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	dict_table_autoinc_initialize(prebuilt->table, auto_inc);

func_exit:
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  	(void) extra(HA_EXTRA_NO_KEYREAD);
5643

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	index_end();

	*ret = auto_inc;

  	return(error);
}

/***********************************************************************
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. */

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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;
	
	error = innobase_read_and_init_auto_inc(&nr);

	if (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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/***********************************************************************
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This function stores the binlog offset and flushes logs. */
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void 
innobase_store_binlog_offset_and_flush_log(
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/*=======================================*/
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    char *binlog_name,          /* in: binlog name */
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    longlong 	offset)		/* in: binlog offset */
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{
	mtr_t mtr;
	
	assert(binlog_name != NULL);

	/* Start a mini-transaction */
        mtr_start_noninline(&mtr); 

	/* Update the latest MySQL binlog name and offset info
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        in trx sys header */
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        trx_sys_update_mysql_binlog_offset(
            binlog_name,
            offset,
            TRX_SYS_MYSQL_LOG_INFO, &mtr);

        /* Commits the mini-transaction */
        mtr_commit(&mtr);
        
	/* Syncronous flush of the log buffer to disk */
	log_buffer_flush_to_disk();
}
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int
ha_innobase::cmp_ref(
	const mysql_byte *ref1,
	const mysql_byte *ref2)
{
	row_prebuilt_t*	 prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	enum_field_types mysql_type;
	Field*		 field;
	int result;

	if (prebuilt->clust_index_was_generated)
		return memcmp(ref1, ref2, DATA_ROW_ID_LEN);

	/* Do type-aware comparison of Primary Key members. PK members
	are always NOT NULL, so no checks for NULL are performed */
	KEY_PART_INFO *key_part= table->key_info[table->primary_key].key_part;
	KEY_PART_INFO *key_part_end= 
	  key_part + table->key_info[table->primary_key].key_parts;
	for (; key_part != key_part_end; ++key_part) {
		field = key_part->field;
		mysql_type = field->type();
		if (mysql_type == FIELD_TYPE_TINY_BLOB
		    || mysql_type == FIELD_TYPE_MEDIUM_BLOB
		    || mysql_type == FIELD_TYPE_BLOB
		    || mysql_type == FIELD_TYPE_LONG_BLOB) {
		    
			ut_a(!ref1[1]);
			ut_a(!ref2[1]);
			byte len1= *ref1;
			byte len2= *ref2;
			ref1 += 2;
			ref2 += 2;
			result =
			  ((Field_blob*)field)->cmp((const char*)ref1, len1,
			                            (const char*)ref2, len2);
		} else {
			result = 
			  field->cmp((const char*)ref1, (const char*)ref2);
		}

		if (result)
			return result;
		ref1 += key_part->length;
		ref2 += key_part->length;
	}
	return 0;
}

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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! */
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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 */
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	charset = get_charset(charset_id, MYF(MY_WME));
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	ut_ad(charset);
	ut_ad(charset->mbmaxlen);
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	/* Calculate how many characters at most the prefix index contains */
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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. */
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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,
						str + data_len, n_chars);
		if (char_length > data_len) {
			char_length = data_len;
		}		
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	} else {
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		if (data_len < prefix_len) {
			char_length = data_len;
		} else {
			char_length = prefix_len;
		}
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	}
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	return(char_length);
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}
}

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extern "C" {
/**********************************************************************
This function returns true if SQL-query in the current thread
is either REPLACE or LOAD DATA INFILE REPLACE. 
NOTE that /mysql/innobase/row/row0ins.c must contain the 
prototype for this function ! */

ibool
innobase_query_is_replace(void)
/*===========================*/
{
	THD*	thd;
	
	thd = (THD *)innobase_current_thd();
	
	if ( thd->lex->sql_command == SQLCOM_REPLACE ||
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	     thd->lex->sql_command == SQLCOM_REPLACE_SELECT ||
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	     ( thd->lex->sql_command == SQLCOM_LOAD &&
	       thd->lex->duplicates == DUP_REPLACE )) {
		return true;
	} else {
		return false;
	}
}
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}

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/***********************************************************************
This function is used to prepare X/Open XA distributed transaction   */

int innobase_xa_prepare(
/*====================*/
			/* 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;
        trx_t* trx;

        trx = check_trx_exists(thd);

	/* TODO: Get X/Open XA Transaction Identification from MySQL*/
	memset(&trx->xid, 0, sizeof(trx->xid));
	trx->xid.formatID = -1;

	/* 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) {

		fprintf(stderr,
"InnoDB: Error: thd->transaction.all.innodb_active_trans == 0\n"
"InnoDB: but trx->conc_state != TRX_NOT_STARTED\n");
	}

	if (all || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
	        
 		/* We were instructed to prepare the whole transaction, or
		this is an SQL statement end and autocommit is on */

		error = trx_prepare_for_mysql(trx);
	} 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 */
		  	
			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   */

int innobase_xa_recover(
				/* out: number of prepared transactions 
				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) {
		return 0;
	}

	return (trx_recover_for_mysql(xid_list, len));
}

/***********************************************************************
This function is used to commit one X/Open XA distributed transaction
which is in the prepared state */

int innobase_commit_by_xid(
/*=======================*/
			/* out: 0 or error number */
	XID*	xid)	/*  in: X/Open XA Transaction Identification */
{
	trx_t*	trx;

	trx = trx_get_trx_by_xid(xid);

	if (trx) {
		innobase_commit_low(trx);
		
		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 */

int innobase_rollback_by_xid(
			/* out: 0 or error number */
	XID	*xid)	/* in : X/Open XA Transaction Idenfification */
{
	trx_t*	trx;

	trx = trx_get_trx_by_xid(xid);

	if (trx) {
		return(innobase_rollback_trx(trx));
	} else {
		return(XAER_NOTA);
	}
}

/***********************************************************************
This function is used to test commit/rollback of XA transactions */

int innobase_xa_end(
/*================*/
	THD*	thd)	/* in: MySQL thread handle of the user for whom
			transactions should be recovered */
{
        DBUG_ENTER("innobase_xa_end");

	XID trx_list[100];
	int trx_num, trx_num_max = 100;
	int i;
	XID xid;

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	while((trx_num = innobase_xa_recover(trx_list, trx_num_max))) {
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		for(i=0;i < trx_num; i++) {
			xid = trx_list[i];

			if ( i % 2) {
				innobase_commit_by_xid(&xid);
			} else {
				innobase_rollback_by_xid(&xid);
			}
		}
	}

	free(trx_list);

	DBUG_RETURN(0);
}
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#endif /* HAVE_INNOBASE_DB */