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BUG#121915: Merge 4.1->5.0

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sergefp@mysql.com
2005-10-19 01:52:06 +04:00
parent 5db97a8d9a d6903c4566
commit e7065d355c
13 changed files with 344 additions and 20 deletions
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26
sql/sql_update.cc
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@ -122,7 +122,8 @@ int mysql_update(THD *thd,
bool used_key_is_modified, transactional_table;
int res;
int error=0;
uint used_index;
uint used_index= MAX_KEY;
bool need_sort= TRUE;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
uint want_privilege;
#endif
@ -241,6 +242,11 @@ int mysql_update(THD *thd,
send_ok(thd); // No matching records
DBUG_RETURN(0);
}
if (!select && limit != HA_POS_ERROR)
{
if (MAX_KEY != (used_index= get_index_for_order(table, order, limit)))
need_sort= FALSE;
}
/* If running in safe sql mode, don't allow updates without keys */
if (table->quick_keys.is_clear_all())
{
@ -261,6 +267,10 @@ int mysql_update(THD *thd,
used_key_is_modified= (!select->quick->unique_key_range() &&
select->quick->check_if_keys_used(&fields));
}
else if (used_index != MAX_KEY)
{
used_key_is_modified= check_if_key_used(table, used_index, fields);
}
else if ((used_index=table->file->key_used_on_scan) < MAX_KEY)
used_key_is_modified=check_if_key_used(table, used_index, fields);
else
@ -276,10 +286,11 @@ int mysql_update(THD *thd,
if (used_index < MAX_KEY && old_used_keys.is_set(used_index))
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
table->file->extra(HA_EXTRA_KEYREAD); //todo: psergey: check
}
if (order)
/* note: can actually avoid sorting below.. */
if (order && need_sort)
{
/*
Doing an ORDER BY; Let filesort find and sort the rows we are going
@ -323,7 +334,10 @@ int mysql_update(THD *thd,
/* If quick select is used, initialize it before retrieving rows. */
if (select && select->quick && select->quick->reset())
goto err;
init_read_record(&info,thd,table,select,0,1);
if (used_index == MAX_KEY)
init_read_record(&info,thd,table,select,0,1);
else
init_read_record_idx(&info, thd, table, 1, used_index);
thd->proc_info="Searching rows for update";
uint tmp_limit= limit;
@ -352,6 +366,10 @@ int mysql_update(THD *thd,
error= 1; // Aborted
limit= tmp_limit;
end_read_record(&info);
/* if we got here we must not use index in the main update loop below */
used_index= MAX_KEY;
/* Change select to use tempfile */
if (select)
{