ha_innodb.cc 158 KB
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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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}

#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,
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     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);

/* 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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/**********************************************************************
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;
			my_error(EE_OUT_OF_FILERESOURCES,
				MYF(ME_BELL+ME_WAITTANG), filename, my_errno);
		}
		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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}

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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 -------------------------*/
908

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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 */

	data_mysql_default_charset_coll = (ulint)default_charset_info->number;

	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
		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));
}

/*********************************************************************
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
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							+ MAX_REF_PARTS * 3;
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	if (!(mysql_byte*) my_multi_malloc(MYF(MY_WME),
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				     &upd_buff, upd_and_key_val_buff_len,
				     &key_val_buff, upd_and_key_val_buff_len,
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				     NullS)) {
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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;
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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;
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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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	auto_inc_counter_for_this_stat = 0;

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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);
1734 1735

  	info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
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  	DBUG_RETURN(0);
}

/**********************************************************************
1741
Closes a handle to an InnoDB table. */
1742 1743 1744 1745 1746 1747 1748 1749 1750 1751

int
ha_innobase::close(void)
/*====================*/
				/* out: error number */
{
  	DBUG_ENTER("ha_innobase::close");

	row_prebuilt_free((row_prebuilt_t*) innobase_prebuilt);

1752
    	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
1756 1757 1758 1759 1760 1761 1762
	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);
}

1839 1840
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! */
1845 1846 1847

int
innobase_mysql_cmp(
1848
/*===============*/
1849 1850
					/* out: 1, 0, -1, if a is greater,
					equal, less than b, respectively */
1851
	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;
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	enum_field_types	mysql_tp;
1862
	int                     ret;
1863

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	DBUG_ASSERT(a_length != UNIV_SQL_NULL);
	DBUG_ASSERT(b_length != UNIV_SQL_NULL);
1866 1867 1868 1869 1870 1871 1872

	mysql_tp = (enum_field_types) mysql_type;

	switch (mysql_tp) {

	case FIELD_TYPE_STRING:
	case FIELD_TYPE_VAR_STRING:
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	case FIELD_TYPE_TINY_BLOB:
	case FIELD_TYPE_MEDIUM_BLOB:
	case FIELD_TYPE_BLOB:
	case FIELD_TYPE_LONG_BLOB:
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		/* 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,
                                  b, b_length);
1905
		if (ret < 0) {
1906
		        return(-1);
1907
		} else if (ret > 0) {
1908
		        return(1);
1909
		} else {
1910
		        return(0);
1911
	        }
1912 1913 1914 1915 1916 1917 1918 1919 1920
	default:
		assert(0);
	}

	return(0);
}
}

/******************************************************************
1921
Converts a MySQL type to an InnoDB type. */
1922 1923
inline
ulint
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get_innobase_type_from_mysql_type(
/*==============================*/
			/* out: DATA_BINARY, DATA_VARCHAR, ... */
1927 1928
	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 */
1932

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	DBUG_ASSERT((ulint)FIELD_TYPE_STRING < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_VAR_STRING < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_DOUBLE < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_FLOAT < 256);
	DBUG_ASSERT((ulint)FIELD_TYPE_DECIMAL < 256);
1938 1939

	switch (field->type()) {
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	        /* NOTE that we only allow string types in DATA_MYSQL
		and DATA_VARMYSQL */
1942
		case FIELD_TYPE_VAR_STRING: if (field->binary()) {
1943 1944 1945

						return(DATA_BINARY);
					} else if (strcmp(
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						  field->charset()->name,
						 "latin1_swedish_ci") == 0) {
1948
						return(DATA_VARCHAR);
1949 1950
					} else {
						return(DATA_VARMYSQL);
1951
					}
1952
		case FIELD_TYPE_STRING: if (field->binary()) {
1953 1954 1955

						return(DATA_FIXBINARY);
					} else if (strcmp(
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						   field->charset()->name,
						   "latin1_swedish_ci") == 0) {
1958
						return(DATA_CHAR);
1959 1960
					} else {
						return(DATA_MYSQL);
1961
					}
1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972
		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:
1973 1974 1975
		case FIELD_TYPE_TIME:
		case FIELD_TYPE_TIMESTAMP:
					return(DATA_INT);
1976
		case FIELD_TYPE_FLOAT:
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					return(DATA_FLOAT);
1978
		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);
}
1993

1994
/***********************************************************************
1995
Stores a key value for a row to a buffer. */
1996 1997 1998 1999 2000 2001 2002

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
2003 2004
				format) */
	uint		buff_len,/* in: buffer length */
2005
	const mysql_byte* record)/* in: row in MySQL format */
2006 2007 2008 2009 2010
{
	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;
2016

2017 2018
  	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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2039
	bzero(buff, buff_len);
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2041
  	for (; key_part != end; key_part++) {
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2042
	        is_null = FALSE;
2043 2044 2045 2046

    		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++;
2053
    		}
2054

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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) {
2062

2063
			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);
2086
			*((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;
		}
2102 2103
  	}

2104
	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
2113
void
2114 2115 2116 2117 2118 2119 2120 2121 2122
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 */
2123
{
2124 2125
	dict_index_t*	index;
	dict_index_t*	clust_index;
2126
	mysql_row_templ_t* templ;
2127
	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	= FALSE;
2132
	ulint		i;
2133

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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) {
2145

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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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2175
	if (templ_type == ROW_MYSQL_REC_FIELDS) {
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		index = prebuilt->index;
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	} else {
		index = clust_index;
2179
	}
2180

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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 */
	}
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	n_fields = (ulint)table->fields; /* number of columns */
2190 2191 2192 2193 2194 2195

	if (!prebuilt->mysql_template) {
		prebuilt->mysql_template = (mysql_row_templ_t*)
						mem_alloc_noninline(
					n_fields * sizeof(mysql_row_templ_t));
	}
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	prebuilt->template_type = templ_type;
	prebuilt->null_bitmap_len = table->null_bytes;
2199

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	prebuilt->templ_contains_blob = FALSE;

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	/* Note that in InnoDB, i is the column number. MySQL calls columns
	'fields'. */
2204
	for (i = 0; i < n_fields; i++) {
2205
		templ = prebuilt->mysql_template + n_requested_fields;
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		field = table->field[i];

2208
		if (templ_type == ROW_MYSQL_REC_FIELDS
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		    && !(fetch_all_in_key
			 && dict_index_contains_col_or_prefix(index, i))
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		    && !(fetch_primary_key_cols
			 && dict_table_col_in_clustered_key(index->table, i))
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		    && thd->query_id != field->query_id) {

			/* This field is not needed in the query, skip it */
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			goto skip_field;
		}

		n_requested_fields++;
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2222
		templ->col_no = i;
2223

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		if (index == clust_index) {
			templ->rec_field_no = (index->table->cols + i)
								->clust_pos;
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		} else {
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			templ->rec_field_no = dict_index_get_nth_col_pos(
								index, i);
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		}

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		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]);
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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);

2249 2250 2251
		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);
2252

2253 2254
		if (templ->type == DATA_BLOB) {
			prebuilt->templ_contains_blob = TRUE;
2255
		}
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skip_field:
		;
	}
2259

2260
	prebuilt->n_template = n_requested_fields;
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	if (index != clust_index && prebuilt->need_to_access_clustered) {
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		/* 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;
2267

2268 2269 2270
			templ->rec_field_no =
			    (index->table->cols + templ->col_no)->clust_pos;
		}
2271
	}
2272 2273 2274
}

/************************************************************************
2275
Stores a row in an InnoDB database, to the table specified in this
2276 2277 2278 2279 2280
handle. */

int
ha_innobase::write_row(
/*===================*/
2281 2282
				/* out: error code */
	mysql_byte* 	record)	/* in: a row in MySQL format */
2283
{
2284
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
2285
  	int 		error;
2286
	longlong	auto_inc;
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	longlong	dummy;
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	ibool           incremented_auto_inc_for_stat = FALSE;
	ibool           incremented_auto_inc_counter = FALSE;
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	ibool           skip_auto_inc_decr;
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2291

2292
  	DBUG_ENTER("ha_innobase::write_row");
2293

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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"
2298 2299 2300 2301 2302 2303 2304 2305 2306
"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);
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		putc('\n', stderr);
		ut_error;
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	}
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2312 2313
  	statistic_increment(ha_write_count, &LOCK_status);

2314 2315
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
                table->timestamp_field->set_time();
2316

2317
	if (user_thd->lex->sql_command == SQLCOM_ALTER_TABLE
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	    && num_write_row >= 10000) {
2319 2320 2321 2322 2323 2324 2325 2326
		/* 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. */
2327

2328
		dict_table_t*	src_table;
2329 2330
		ibool		mode;

2331
		num_write_row = 0;
2332

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		/* 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. */

2355 2356 2357 2358 2359 2360
			/* 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;
2361 2362 2363 2364 2365
		} 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)) {
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				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. */
2375
			row_lock_table_for_mysql(prebuilt, src_table, mode);
2376 2377 2378
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
		}
2379 2380
	}

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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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		innobase_release_stat_resources(prebuilt->trx);
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	}

2390
  	if (table->next_number_field && record == table->record[0]) {
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		/* This is the case where the table has an
		auto-increment column */
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		/* Initialize the auto-inc counter if it has not been
		initialized yet */

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

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

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

				goto func_exit;
			}

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

			prebuilt->sql_stat_start = TRUE;
		}

2418 2419
	        /* Fetch the value the user possibly has set in the
	        autoincrement field */
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2421 2422
	        auto_inc = table->next_number_field->val_int();

2423 2424 2425
		/* In replication and also otherwise the auto-inc column 
		can be set with SET INSERT_ID. Then we must look at
		user_thd->next_insert_id. If it is nonzero and the user
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2426 2427 2428
		has not supplied a value, we must use it, and use values
		incremented by 1 in all subsequent inserts within the
		same SQL statement! */
2429 2430

		if (auto_inc == 0 && user_thd->next_insert_id != 0) {
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		        auto_inc_counter_for_this_stat
						= user_thd->next_insert_id;
2434
		}
2435

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2436 2437 2438 2439 2440 2441 2442 2443 2444 2445
		if (auto_inc == 0 && auto_inc_counter_for_this_stat) {
			/* The user set the auto-inc counter for
			this SQL statement with SET INSERT_ID. We must
			assign sequential values from the counter. */

			auto_inc = auto_inc_counter_for_this_stat;

			/* We give MySQL a new value to place in the
			auto-inc column */
			user_thd->next_insert_id = auto_inc;
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			auto_inc_counter_for_this_stat++;
			incremented_auto_inc_for_stat = TRUE;
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2449
		}
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2450

2451
		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 */
2455 2456 2457 2458 2459 2460 2461 2462

			/* 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. */

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			innodb_srv_conc_enter_innodb(prebuilt->trx);
2464
			error = row_lock_table_autoinc_for_mysql(prebuilt);
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			innodb_srv_conc_exit_innodb(prebuilt->trx);
2466 2467

			if (error != DB_SUCCESS) {
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2468

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				error = convert_error_code_to_mysql(error,
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								    user_thd);
2471 2472
				goto func_exit;
			}	
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2474 2475
			dict_table_autoinc_update(prebuilt->table, auto_inc);
		} else {
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			innodb_srv_conc_enter_innodb(prebuilt->trx);
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2478 2479 2480 2481 2482
			if (!prebuilt->trx->auto_inc_lock) {

				error = row_lock_table_autoinc_for_mysql(
								prebuilt);
				if (error != DB_SUCCESS) {
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 					innodb_srv_conc_exit_innodb(
							prebuilt->trx);
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2485

2486
					error = convert_error_code_to_mysql(
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2487
							error, user_thd);
2488 2489 2490 2491
					goto func_exit;
				}
			}	

2492 2493 2494
			/* The following call gets the value of the auto-inc
			counter of the table and increments it by 1 */

2495
			auto_inc = dict_table_autoinc_get(prebuilt->table);
2496 2497
			incremented_auto_inc_counter = TRUE;

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			innodb_srv_conc_exit_innodb(prebuilt->trx);
2499

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			/* We can give the new value for MySQL to place in
			the field */
2502

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			user_thd->next_insert_id = auto_inc;
2504
		}
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		/* This call of a handler.cc function places
		user_thd->next_insert_id to the column value, if the column
		value was not set by the user */
2509

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    		update_auto_increment();
	}
2512

2513 2514 2515 2516
	if (prebuilt->mysql_template == NULL
			|| prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {
		/* Build the template used in converting quickly between
		the two database formats */
2517

2518 2519
		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}
2520

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2521
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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2522

2523
	error = row_insert_for_mysql((byte*) record, prebuilt);
2524

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2525
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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2526

2527 2528 2529
	if (error != DB_SUCCESS) {
	        /* If the insert did not succeed we restore the value of
		the auto-inc counter we used; note that this behavior was
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		introduced only in version 4.0.4.
2531 2532
		NOTE that a REPLACE command and LOAD DATA INFILE REPLACE
		handles a duplicate key error
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		itself, and we must not decrement the autoinc counter
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		if we are performing those statements.
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2535 2536 2537 2538 2539
		NOTE 2: if there was an error, for example a deadlock,
		which caused InnoDB to roll back the whole transaction
		already in the call of row_insert_for_mysql(), we may no
		longer have the AUTO-INC lock, and cannot decrement
		the counter here. */
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2540 2541

	        skip_auto_inc_decr = FALSE;
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2542

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	        if (error == DB_DUPLICATE_KEY
2544 2545
		    && (user_thd->lex->sql_command == SQLCOM_REPLACE
			|| user_thd->lex->sql_command
2546 2547 2548
			                 == SQLCOM_REPLACE_SELECT
		    	|| (user_thd->lex->sql_command == SQLCOM_LOAD
			    && user_thd->lex->duplicates == DUP_REPLACE))) {
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2549 2550 2551

		        skip_auto_inc_decr= TRUE;
		}
2552

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2553 2554
	        if (!skip_auto_inc_decr && incremented_auto_inc_counter
		    && prebuilt->trx->auto_inc_lock) {
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2555
	                dict_table_autoinc_decrement(prebuilt->table);
2556 2557
	        }

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2558 2559
		if (!skip_auto_inc_decr && incremented_auto_inc_for_stat
		    && prebuilt->trx->auto_inc_lock) {
2560 2561 2562 2563
		        auto_inc_counter_for_this_stat--;
		}
	}

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2564
	error = convert_error_code_to_mysql(error, user_thd);
2565

2566
	/* Tell InnoDB server that there might be work for
2567
	utility threads: */
2568
func_exit:
2569
	innobase_active_small();
2570 2571 2572 2573

  	DBUG_RETURN(error);
}

2574
/******************************************************************
2575
Converts field data for storage in an InnoDB update vector. */
2576 2577 2578 2579 2580 2581 2582 2583 2584 2585
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 */
2586
	ulint		col_type,/* in: data type in InnoDB type numbers */
2587
	ulint		is_unsigned)/* in: != 0 if an unsigned integer type */
2588
{
2589 2590 2591 2592
	uint	i;

	if (len == UNIV_SQL_NULL) {
		data = NULL;
2593 2594
	} else if (col_type == DATA_VARCHAR || col_type == DATA_BINARY
		   || col_type == DATA_VARMYSQL) {
2595 2596 2597 2598
	        /* Remove trailing spaces */
        	while (len > 0 && data[len - 1] == ' ') {
	                len--;
	        }
2599
	} else if (col_type == DATA_INT) {
2600
		/* Store integer data in InnoDB in a big-endian
2601
		format, sign bit negated, if signed */
2602

2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613
		for (i = 0; i < len; i++) {
			buf[len - 1 - i] = data[i];
		}

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

		data = buf;

		buf += len;
2614
	}
2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632

	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 */
2635
	mysql_byte*	upd_buff,	/* in: buffer to use */
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	ulint		buff_len,	/* in: buffer length */
2637
	row_prebuilt_t*	prebuilt,	/* in: InnoDB prebuilt struct */
2638 2639
	THD*		thd)		/* in: user thread */
{
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	mysql_byte*	original_upd_buff = upd_buff;
2641
	Field*		field;
2642 2643 2644
	uint		n_fields;
	ulint		o_len;
	ulint		n_len;
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	byte*	        o_ptr;
        byte*	        n_ptr;
        byte*	        buf;
2648
	upd_field_t*	ufield;
2649 2650
	ulint		col_type;
	ulint		is_unsigned;
2651
	ulint		n_changed = 0;
2652
	uint		i;
2653 2654 2655

	n_fields = table->fields;

2656
	/* We use upd_buff to convert changed fields */
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	buf = (byte*) upd_buff;
2658

2659 2660 2661
	for (i = 0; i < n_fields; i++) {
		field = table->field[i];

2662
		/* if (thd->query_id != field->query_id) { */
2663 2664
			/* TODO: check that these fields cannot have
			changed! */
2665

2666 2667
		/*	goto skip_field;
		}*/
2668

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		o_ptr = (byte*) old_row + get_field_offset(table, field);
		n_ptr = (byte*) new_row + get_field_offset(table, field);
2671 2672 2673
		o_len = field->pack_length();
		n_len = field->pack_length();

2674
		col_type = get_innobase_type_from_mysql_type(field);
2675
		is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
2676 2677 2678 2679 2680 2681 2682 2683 2684 2685

		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);
2690 2691 2692
		default:
			;
		}
2693

2694
		if (field->null_ptr) {
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			if (field_in_record_is_null(table, field,
							(char*) old_row)) {
2697 2698
				o_len = UNIV_SQL_NULL;
			}
2699

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			if (field_in_record_is_null(table, field,
							(char*) new_row)) {
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				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,
2716
						is_unsigned);
2717
			ufield->exp = NULL;
2718 2719
			ufield->field_no =
					(prebuilt->table->cols + i)->clust_pos;
2720 2721 2722 2723 2724 2725 2726
			n_changed++;
		}
	}

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

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

2729 2730 2731 2732 2733 2734 2735
	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.
2736
TODO: currently InnoDB does not prevent the 'Halloween problem':
2737 2738
in a searched update a single row can get updated several times
if its index columns are updated! */
2739

2740 2741 2742 2743
int
ha_innobase::update_row(
/*====================*/
					/* out: error number or 0 */
2744 2745
	const mysql_byte* 	old_row,/* in: old row in MySQL format */
	mysql_byte* 		new_row)/* in: new row in MySQL format */
2746 2747 2748 2749 2750
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	upd_t*		uvect;
	int		error = 0;

2751
	DBUG_ENTER("ha_innobase::update_row");
2752

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	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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2755

2756 2757
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
                table->timestamp_field->set_time();
2758

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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);
	}
2771 2772 2773 2774

	/* Build an update vector from the modified fields in the rows
	(uses upd_buff of the handle) */

2775
	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);

2779 2780 2781
	/* This is not a delete */
	prebuilt->upd_node->is_delete = FALSE;

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	assert(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW);
2783

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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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2785

2786
	error = row_update_for_mysql((byte*) old_row, prebuilt);
2787

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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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2789

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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);
}

/**********************************************************************
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(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 */
3014

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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 */
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{
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	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key=0;
	statistic_increment(ha_read_key_count, &LOCK_status);
	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
3162 3163
					row */
	uint 		keynr,		/* in: use this index */
3164
	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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3197
	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(ha_read_next_count, &LOCK_status);

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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(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 */
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	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(
/*=====================*/
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				/* out: 0, HA_ERR_END_OF_FILE,
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				or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
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{
	int	error;

  	DBUG_ENTER("index_first");
  	statistic_increment(ha_read_first_count, &LOCK_status);

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

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        /* 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;
  	}

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  	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(
/*====================*/
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				/* out: 0, HA_ERR_END_OF_FILE, or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
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{
	int	error;

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  	DBUG_ENTER("index_last");
3316
  	statistic_increment(ha_read_last_count, &LOCK_status);
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  	error = index_read(buf, NULL, 0, HA_READ_BEFORE_KEY);

3320
        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */
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  	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 */
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	bool	scan)	/* in: ???????? */
3337
{
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	int	err;
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	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
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	/* Store the active index value so that we can restore the original
	value after a scan */

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	if (prebuilt->clust_index_was_generated) {
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		err = change_active_index(MAX_KEY);
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	} else {
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		err = change_active_index(primary_key);
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	}
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  	start_of_scan = 1;
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 	return(err);
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}

/*********************************************************************
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Ends a table scan. */
3358 3359 3360 3361 3362 3363

int
ha_innobase::rnd_end(void)
/*======================*/
				/* out: 0 or error number */
{
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	return(index_end());
3365 3366 3367 3368 3369 3370 3371 3372 3373 3374
}

/*********************************************************************
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 */
3375
	mysql_byte* buf)/* in/out: returns the row in this buffer,
3376 3377
			in MySQL format */
{
3378
	int	error;
3379 3380 3381 3382

  	DBUG_ENTER("rnd_next");
  	statistic_increment(ha_read_rnd_next_count, &LOCK_status);

3383
  	if (start_of_scan) {
3384 3385 3386 3387
		error = index_first(buf);
		if (error == HA_ERR_KEY_NOT_FOUND) {
			error = HA_ERR_END_OF_FILE;
		}
3388
		start_of_scan = 0;
3389
	} else {
3390
		error = general_fetch(buf, ROW_SEL_NEXT, 0);
3391
	}
3392

3393 3394 3395 3396
  	DBUG_RETURN(error);
}

/**************************************************************************
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Fetches a row from the table based on a row reference. */
3398

3399 3400 3401
int
ha_innobase::rnd_pos(
/*=================*/
3402 3403 3404
				/* 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 */
3410
{
3411 3412 3413
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error;
	uint		keynr	= active_index;
3414
	DBUG_ENTER("rnd_pos");
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	DBUG_DUMP("key", (char*) pos, ref_length);
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3417
	statistic_increment(ha_read_rnd_count, &LOCK_status);
3418

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	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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3422 3423 3424 3425
	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 */
3427

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		error = change_active_index(MAX_KEY);
3429
	} else {
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		error = change_active_index(primary_key);
3431
	}
3432

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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));
	}
3446
	change_active_index(keynr);
3447

3448 3449 3450 3451
  	DBUG_RETURN(error);
}

/*************************************************************************
3452
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
3456
the row id internally generated in InnoDB, then 'record' does not contain
3457 3458
it. We just guess that the row id must be for the record where the handle
was positioned the last time. */
3459 3460 3461 3462

void
ha_innobase::position(
/*==================*/
3463
	const mysql_byte*	record)	/* in: row in MySQL format */
3464
{
3465 3466
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	uint		len;
3467

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	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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3471 3472 3473 3474
	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 */
3476 3477 3478 3479 3480

		len = DATA_ROW_ID_LEN;

		memcpy(ref, prebuilt->row_id, len);
	} else {
3481 3482
		len = store_key_val_for_row(primary_key, (char*)ref,
							 ref_length, record);
3483
	}
3484

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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",
3492
		  (ulong)len, (ulong)ref_length);
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	}
3494 3495 3496
}

/*********************************************************************
3497
Creates a table definition to an InnoDB database. */
3498 3499 3500 3501
static
int
create_table_def(
/*=============*/
3502
	trx_t*		trx,		/* in: InnoDB transaction handle */
3503 3504
	TABLE*		form,		/* in: information on table
					columns and indexes */
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	const char*	table_name,	/* in: table name */
	const char*	path_of_temp_table)/* in: if this is a table explicitly
					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 */
3514 3515 3516 3517 3518 3519
{
	Field*		field;
	dict_table_t*	table;
	ulint		n_cols;
  	int 		error;
  	ulint		col_type;
3520 3521
  	ulint		nulls_allowed;
	ulint		unsigned_type;
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	ulint		binary_type;
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	ulint		charset_no;
3524
  	ulint		i;
3525

3526 3527 3528 3529 3530
  	DBUG_ENTER("create_table_def");
  	DBUG_PRINT("enter", ("table_name: %s", table_name));

	n_cols = form->fields;

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3531 3532
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3533 3534

	table = dict_mem_table_create((char*) table_name, 0, n_cols);
3535

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

3541 3542 3543
	for (i = 0; i < n_cols; i++) {
		field = form->field[i];

3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555
		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;
		}
3556

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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 */
		}

3573
		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
3577
					| binary_type,
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					+ charset_no),
3579 3580 3581 3582 3583
					field->pack_length(), 0);
	}

	error = row_create_table_for_mysql(table, trx);

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	error = convert_error_code_to_mysql(error, NULL);
3585 3586 3587 3588 3589

	DBUG_RETURN(error);
}

/*********************************************************************
3590
Creates an index in an InnoDB database. */
3591 3592
static
int
3593 3594
create_index(
/*=========*/
3595
	trx_t*		trx,		/* in: InnoDB transaction handle */
3596 3597 3598 3599 3600
	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;
3602
	dict_index_t*	index;
3603
  	int 		error;
3604 3605 3606 3607
	ulint		n_fields;
	KEY*		key;
	KEY_PART_INFO*	key_part;
	ulint		ind_type;
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	ulint		col_type;
	ulint		prefix_len;
3610
  	ulint		i;
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  	ulint		j;
3612

3613
  	DBUG_ENTER("create_index");
3614

3615 3616 3617
	key = form->key_info + key_num;

    	n_fields = key->key_parts;
3618

3619 3620
    	ind_type = 0;

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    	if (key_num == form->primary_key) {
3622 3623
		ind_type = ind_type | DICT_CLUSTERED;
	}
3624

3625 3626 3627 3628
	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 */
3631 3632 3633 3634 3635 3636

	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;

3637
		/* (The flag HA_PART_KEY_SEG denotes in MySQL a column prefix
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3638 3639 3640 3641 3642 3643 3644 3645 3646 3647
		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];

3648 3649 3650
			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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3672 3673
"InnoDB: on an inappropriate data type. Table name %s, column name %s.\n",
				  table_name, key_part->field->field_name);
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3674 3675 3676 3677 3678
			        
			        prefix_len = 0;
			}
		} else {
		        prefix_len = 0;
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3679 3680
		}

3681 3682
		/* We assume all fields should be sorted in ascending
		order, hence the '0': */
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3683

3684
		dict_mem_index_add_field(index,
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3685 3686
				(char*) key_part->field->field_name,
				0, prefix_len);
3687 3688 3689 3690
	}

	error = row_create_index_for_mysql(index, trx);

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3691
	error = convert_error_code_to_mysql(error, NULL);
3692 3693 3694 3695 3696

	DBUG_RETURN(error);
}

/*********************************************************************
3697
Creates an index to an InnoDB table when the user has defined no
3698
primary index. */
3699 3700
static
int
3701 3702
create_clustered_index_when_no_primary(
/*===================================*/
3703
	trx_t*		trx,		/* in: InnoDB transaction handle */
3704 3705 3706
	const char*	table_name)	/* in: table name */
{
	dict_index_t*	index;
3707 3708
  	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 */
3711

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	index = dict_mem_index_create((char*) table_name,
				      (char*) "GEN_CLUST_INDEX",
				      0, DICT_CLUSTERED, 0);
3715 3716
	error = row_create_index_for_mysql(index, trx);

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3717
	error = convert_error_code_to_mysql(error, NULL);
3718

3719
	return(error);
3720 3721 3722
}

/*********************************************************************
3723
Creates a new table to an InnoDB database. */
3724 3725 3726 3727 3728 3729 3730 3731

int
ha_innobase::create(
/*================*/
					/* out: error number */
	const char*	name,		/* in: table name */
	TABLE*		form,		/* in: information on table
					columns and indexes */
3732 3733 3734
	HA_CREATE_INFO*	create_info)	/* in: more information of the
					created table, contains also the
					create statement string */
3735 3736 3737
{
	int		error;
	dict_table_t*	innobase_table;
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	trx_t*		parent_trx;
3739
	trx_t*		trx;
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3740
	int		primary_key_no;
3741
	uint		i;
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3742 3743
	char		name2[FN_REFLEN];
	char		norm_name[FN_REFLEN];
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	THD		*thd= current_thd;
3745

3746 3747
  	DBUG_ENTER("ha_innobase::create");

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3748
	DBUG_ASSERT(thd != NULL);
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3749

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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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3755 3756
	} 

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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);	
	
3767
	trx = trx_allocate_for_mysql();
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3768 3769 3770
		
	trx->mysql_thd = thd;
	trx->mysql_query_str = &((*thd).query);
3771

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3772
	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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3785

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	fn_format(name2, name, "", "", 2);	// Remove the .frm extension
3787 3788

	normalize_table_name(norm_name, name2);
3789

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3790
	/* 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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3793

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	row_mysql_lock_data_dictionary(trx);
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3795 3796

	/* Create the table definition in InnoDB */
3797

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3798 3799 3800 3801 3802 3803 3804
	if (create_info->options & HA_LEX_CREATE_TMP_TABLE) {

  		error = create_table_def(trx, form, norm_name, name2);
	} else {
		error = create_table_def(trx, form, norm_name, NULL);
	}

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3805
  	if (error) {
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		innobase_commit_low(trx);
3807

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		row_mysql_unlock_data_dictionary(trx);
3809 3810 3811 3812 3813 3814

  		trx_free_for_mysql(trx);

 		DBUG_RETURN(error);
 	}

3815 3816
	/* Look for a primary key */

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3817 3818 3819
	primary_key_no= (table->primary_key != MAX_KEY ?
			 (int) table->primary_key : 
			 -1);
3820

3821 3822 3823
	/* Our function row_get_mysql_key_number_for_index assumes
	the primary key is always number 0, if it exists */

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3824
	DBUG_ASSERT(primary_key_no == -1 || primary_key_no == 0);
3825

3826 3827
	/* Create the keys */

3828 3829 3830
	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
3831
		by InnoDB */
3832

3833
		error = create_clustered_index_when_no_primary(trx,
3834
							norm_name);
3835
  		if (error) {
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3836 3837
			innobase_commit_low(trx);

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			row_mysql_unlock_data_dictionary(trx);
3839

3840 3841 3842 3843
			trx_free_for_mysql(trx);

			DBUG_RETURN(error);
      		}
3844 3845 3846
	}

	if (primary_key_no != -1) {
3847
		/* In InnoDB the clustered index must always be created
3848
		first */
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3849 3850
	    	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);
3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864

  			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))) {
3866

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			  	innobase_commit_low(trx);
3868

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				row_mysql_unlock_data_dictionary(trx);
3870 3871 3872 3873 3874

  				trx_free_for_mysql(trx);

				DBUG_RETURN(error);
      			}
3875
      		}
3876
  	}
3877

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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);
		}
3892

3893 3894
		if (error) {
			innobase_commit_low(trx);
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3895

3896
			row_mysql_unlock_data_dictionary(trx);
3897

3898
  			trx_free_for_mysql(trx);
3899

3900 3901
			DBUG_RETURN(error);
		}
3902 3903
	}

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  	innobase_commit_low(trx);

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	row_mysql_unlock_data_dictionary(trx);
3907

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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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3913

3914
	innobase_table = dict_table_get(norm_name, NULL);
3915

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	DBUG_ASSERT(innobase_table != 0);
3917

3918
	/* 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;
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	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);

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

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

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

	DBUG_RETURN(-1);
}

3964
/*********************************************************************
3965
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
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operation inside InnoDB will remove all locks any user has on the table
inside InnoDB. */
3970 3971 3972 3973

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;
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	char	norm_name[1000];
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 	DBUG_ENTER("ha_innobase::delete_table");
3985

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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;
	}

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	name_len = strlen(name);

	assert(name_len < 1000);
4018

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	/* Strangely, MySQL passes the table name without the '.frm'
	extension, in contrast to ::create */
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	normalize_table_name(norm_name, name);

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  	/* Drop the table in InnoDB */
4025

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

4078
	ptr = strend(path) - 2;
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	while (ptr >= path && *ptr != '\\' && *ptr != '/') {
		ptr--;
		len++;
	}

	ptr++;
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	namebuf = my_malloc(len + 2, MYF(0));
4087 4088 4089 4090

	memcpy(namebuf, ptr, len);
	namebuf[len] = '/';
	namebuf[len + 1] = '\0';
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#ifdef  __WIN__
4092
	innobase_casedn_str(namebuf);
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#endif
4094
	trx = trx_allocate_for_mysql();
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	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4097

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

4102
  	error = row_drop_database_for_mysql(namebuf, trx);
4103
	my_free(namebuf, MYF(0));
4104

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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);
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	return(error);
}

4124
/*************************************************************************
4125
Renames an InnoDB table. */
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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;
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	trx_t*	trx;
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	char	norm_from[1000];
	char	norm_to[1000];
4141

4142 4143
  	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;
	}

4160
	trx = trx_allocate_for_mysql();
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	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4163 4164 4165 4166 4167 4168

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

	assert(name_len1 < 1000);
	assert(name_len2 < 1000);
4169

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	normalize_table_name(norm_from, from);
	normalize_table_name(norm_to, to);

4173
  	/* Rename the table in InnoDB */
4174

4175
  	error = row_rename_table_for_mysql(norm_from, norm_to, trx);
4176

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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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4183
	/* 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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  	trx_free_for_mysql(trx);

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	error = convert_error_code_to_mysql(error, NULL);
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	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 */
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{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key;
	dict_index_t*	index;
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	mysql_byte*	key_val_buff2 	= (mysql_byte*) my_malloc(
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						  table->reclength
      						+ table->max_key_length + 100,
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								MYF(MY_WME));
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	ulint		buff2_len = table->reclength
      						+ table->max_key_length + 100;
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	dtuple_t*	range_start;
4220
	dtuple_t*	range_end;
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	ib_longlong	n_rows;
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	ulint		mode1;
	ulint		mode2;
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	void*           heap1;
	void*           heap2;
4226

4227
   	DBUG_ENTER("records_in_range");
4228

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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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	active_index = keynr;

	key = table->key_info + active_index;
4239

4240
	index = dict_table_get_index_noninline(prebuilt->table, key->name);
4241

4242
	range_start = dtuple_create_for_mysql(&heap1, key->key_parts);
4243
 	dict_index_copy_types(range_start, index, key->key_parts);
4244

4245
	range_end = dtuple_create_for_mysql(&heap2, key->key_parts);
4246
 	dict_index_copy_types(range_end, index, key->key_parts);
4247

4248
	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),
4254 4255
				(ulint) (min_key ? min_key->length : 0),
				prebuilt->trx);
4256

4257
	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),
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				(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);
4269

4270
	n_rows = btr_estimate_n_rows_in_range(index, range_start,
4271
						mode1, range_end, mode2);
4272 4273
	dtuple_free_for_mysql(heap1);
	dtuple_free_for_mysql(heap2);
4274

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    	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;
	}

4289 4290 4291
	DBUG_RETURN((ha_rows) n_rows);
}

4292 4293
/*************************************************************************
Gives an UPPER BOUND to the number of rows in a table. This is used in
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filesort.cc. */
4295 4296

ha_rows
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ha_innobase::estimate_rows_upper_bound(void)
4298
/*======================================*/
4299
			/* out: upper bound of rows */
4300 4301
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
4302 4303
	dict_index_t*	index;
	ulonglong	estimate;
4304
	ulonglong	local_data_file_length;
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 	DBUG_ENTER("estimate_rows_upper_bound");
4307

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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);
4321

4322
	index = dict_table_get_first_index_noninline(prebuilt->table);
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4324
	local_data_file_length = ((ulonglong) index->stat_n_leaf_pages)
4325
    							* UNIV_PAGE_SIZE;
4326

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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);
4338 4339
}

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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));
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}

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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;
4404
	ha_rows		rec_per_key;
4405 4406
	ulong		j;
	ulong		i;
4407 4408
	char		path[FN_REFLEN];
	os_file_stat_t  stat_info;
4409

4410 4411
 	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) {

4418
                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";

4442
 		dict_update_statistics(ib_table);
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		prebuilt->trx->op_info = (char*)
		                          "returning various info to MySQL";
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		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);
		}

4460 4461 4462
		/* Note that we do not know the access time of the table, 
		nor the CHECK TABLE time, nor the UPDATE or INSERT time. */

4463 4464 4465
		if (os_file_get_status(path,&stat_info)) {
			create_time = stat_info.ctime;
		}
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 	}

	if (flag & HA_STATUS_VARIABLE) {
4469
    		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 {
4483
    			mean_rec_length = (ulong) (data_file_length / records);
4484 4485 4486 4487 4488 4489 4490 4491 4492
    		}
    	}

	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);
		}
4493

4494
		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;
			}

4506 4507
			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,
4516 4517
						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 {
4526
					rec_per_key = (ha_rows)(records /
4527 4528 4529
   				         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;

4537 4538 4539
				if (rec_per_key == 0) {
					rec_per_key = 1;
				}
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4541 4542 4543
 				table->key_info[i].rec_per_key[j]=
				  rec_per_key >= ~(ulong) 0 ? ~(ulong) 0 :
				  rec_per_key;
4544
			}
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4546
			index = dict_table_get_next_index_noninline(index);
4547 4548
		}
	}
4549 4550

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

4553
		errkey = (unsigned int) row_get_mysql_key_number_for_index(
4554 4555
				       (dict_index_t*)
				       trx_get_error_info(prebuilt->trx));
4556 4557
  	}

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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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/**************************************************************************
4581 4582
This is mapped to "ALTER TABLE tablename TYPE=InnoDB", which rebuilds
the table in MySQL. */
4583

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int
ha_innobase::optimize(
/*==================*/
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
4589
{
4590
        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); 
}

4630
/*****************************************************************
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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. */
4634 4635 4636 4637

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 */
4641
{
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	uint	length			= strlen(comment);
	char*				str;
	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
4645

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

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	if(length > 64000 - 3) {
		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);
4662
	str = NULL;
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	if (FILE* file = os_file_create_tmpfile()) {
4665
		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));

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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;
		}
4678

4679
		ut_ad(flen > 0);
4680

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		/* allocate buffer for the full string, and
		read the contents of the temporary file */
4683

4684
		str = my_malloc(length + flen + 3, MYF(0));
4685

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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*)"";

4703
  	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;
4717
	char*	str	= 0;
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	ut_a(prebuilt != NULL);
4720

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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);

4727
	if (FILE* file = os_file_create_tmpfile()) {
4728
		long	flen;
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4730
		prebuilt->trx->op_info = (char*)"getting info on foreign keys";
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		/* In case MySQL calls this in the middle of a SELECT query,
		release possible adaptive hash latch to avoid
		deadlocks of threads */
4735

4736
		trx_search_latch_release_if_reserved(prebuilt->trx);
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4738
		/* output the data to a temporary file */
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		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));
4765
	}
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  	return(str);
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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) {
4801
		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);
                        }
                        prebuilt->read_just_key = 0;
                        break;
  		case HA_EXTRA_RESET_STATE:
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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;
		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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4902
	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(
/*=======================*/
4980
			        /* 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);

4992
 	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;

	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++;
5028
		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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5039
				& (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
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5040

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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) {
5053
			if (thd->in_lock_tables &&
5054
			    thd->variables.innodb_table_locks) {
5055
				ulint	error;
5056 5057
				error = row_lock_table_for_mysql(prebuilt,
							NULL, LOCK_TABLE_EXP);
5058 5059 5060 5061 5062 5063 5064

				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++;
		}

5069
		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);
5079
	}
5080

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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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5083

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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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5094

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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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		}
	}

5111
	DBUG_RETURN(0);
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}

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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. */

int
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");

5128
        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(-1);
        }
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	trx = check_trx_exists(thd);

	innobase_release_stat_resources(trx);

5139
	/* We let the InnoDB Monitor to output at most 64000 bytes of text. */
5140

5141 5142
	long	flen;
	char*	str;
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5144
	mutex_enter_noninline(&srv_monitor_file_mutex);
5145 5146 5147
	rewind(srv_monitor_file);
	srv_printf_innodb_monitor(srv_monitor_file);
	flen = ftell(srv_monitor_file);
5148
	os_file_set_eof(srv_monitor_file);
5149 5150 5151
	if(flen > 64000 - 1) {
		flen = 64000 - 1;
	}
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5153
	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);
          DBUG_RETURN(-1);
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        }
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5163

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	rewind(srv_monitor_file);
	flen = fread(str, 1, flen, srv_monitor_file);
5166

5167
	mutex_exit_noninline(&srv_monitor_file_mutex);
5168

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	List<Item> field_list;

5171
	field_list.push_back(new Item_empty_string("Status", flen));
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5172

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5173
	if (protocol->send_fields(&field_list, 1)) {
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5175
		my_free(str, MYF(0));
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5177
		DBUG_RETURN(-1);
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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())
          DBUG_RETURN(-1);

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	send_eof(thd);
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  	DBUG_RETURN(0);
}

5191 5192 5193 5194 5195
/****************************************************************************
 Handling the shared INNOBASE_SHARE structure that is needed to provide table
 locking.
****************************************************************************/

5196
static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
5197 5198 5199
			      my_bool not_used __attribute__((unused)))
{
  *length=share->table_name_length;
5200
  return (mysql_byte*) share->table_name;
5201 5202 5203 5204 5205 5206 5207
}

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,
5209
					(mysql_byte*) table_name,
5210 5211 5212 5213 5214 5215 5216 5217
					    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);
5225
      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)
  {
5238
    hash_delete(&innobase_open_tables, (mysql_byte*) share);
5239 5240 5241 5242 5243 5244
    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((gptr) share, MYF(0));
  }
  pthread_mutex_unlock(&innobase_mutex);
}
5245 5246

/*********************************************************************
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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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5284
		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
5294
		here even if this would be SELECT ... FOR UPDATE */
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5296
		prebuilt->select_lock_type = LOCK_NONE;
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		prebuilt->stored_select_lock_type = LOCK_NONE;
5298 5299 5300 5301
	}

	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 */
5304 5305

    		if ((lock_type >= TL_WRITE_CONCURRENT_INSERT &&
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5306 5307
	 	    lock_type <= TL_WRITE) && !thd->in_lock_tables
		    && !thd->tablespace_op) {
5308 5309 5310 5311

      			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;
		}
		
5322 5323 5324 5325
 		lock.type=lock_type;
  	}

  	*to++= &lock;
5326

5327 5328 5329
	return(to);
}

5330
/***********************************************************************
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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. */
5335

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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 */
5342
{
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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;
5346

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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);
	}
5365

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	error = row_lock_table_autoinc_for_mysql(prebuilt);
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5367

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	if (error != DB_SUCCESS) {
		error = convert_error_code_to_mysql(error, user_thd);
5370

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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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	}
5382

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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. */
5392

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  	prebuilt->select_lock_type = LOCK_X;
5394

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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;
5399

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	prebuilt->trx->mysql_n_tables_locked += 1;
5401
  
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	error = index_last(table->record[1]);
5403

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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;
  	}
5421

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	dict_table_autoinc_initialize(prebuilt->table, auto_inc);

func_exit:
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  	(void) extra(HA_EXTRA_NO_KEYREAD);
5426

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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. */

longlong
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) {

		return(-1);
	}
5455

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5456
	return(nr);
5457 5458
}

5459
/***********************************************************************
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5460
This function stores the binlog offset and flushes logs. */
5461 5462 5463

void 
innobase_store_binlog_offset_and_flush_log(
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/*=======================================*/
    char 	*binlog_name,	/* in: binlog name */
    longlong 	offset)		/* in: binlog offset */
{
5468 5469 5470 5471 5472 5473 5474 5475
	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 */
5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488

        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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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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}

5505
extern "C" {
5506
/**********************************************************************
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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! */
5514

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ulint
innobase_get_at_most_n_mbchars(
/*===========================*/
				/* out: number of bytes occupied by the first
				n characters */
5520
	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 */
5526
{
5527
	ulint char_length;	/* character length in bytes */
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	ulint n_chars;		/* number of characters in prefix */
5529
	CHARSET_INFO* charset;	/* charset used in the field */
5530

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	charset = get_charset(charset_id, MYF(MY_WME));
5532

5533 5534
	ut_ad(charset);
	ut_ad(charset->mbmaxlen);
5535

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	/* Calculate how many characters at most the prefix index contains */
5537

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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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#endif /* HAVE_INNOBASE_DB */