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Bug #26162: Trigger DML ignores low_priority_updates setting

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The value of "low-priority-updates" option and the LOW PRIORITY
prefix was taken into account at parse time.
This caused triggers (among others) to ignore this flag (if
supplied for the DML statement).
Moved reading of the LOW_PRIORITY flag at run time.
Fixed an incosistency when handling
SET GLOBAL LOW_PRIORITY_UPDATES : now it is in effect for
delayed INSERTs.
Tested by checking the effect of LOW_PRIORITY flag via a 
trigger.


include/thr_lock.h:
  Bug #26162: moved reading of the LOW PRIORITY flag at run time
mysql-test/r/trigger.result:
  Bug #26162: test case
mysql-test/t/trigger.test:
  Bug #26162: test case
sql/set_var.cc:
  Bug #26162: fixed the handling of the "low-priority-updates" option
sql/sql_base.cc:
  Bug #26162: moved reading of the LOW PRIORITY flag at run time
sql/sql_yacc.yy:
  Bug #26162: moved reading of the LOW PRIORITY flag at run time
This commit is contained in:
unknown
2007-06-03 09:40:00 +03:00
parent d7a90fa172
commit f9a41f9f35
6 changed files with 102 additions and 7 deletions
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7
sql/sql_base.cc
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@ -1505,6 +1505,7 @@ TABLE *open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
HASH_SEARCH_STATE state;
DBUG_ENTER("open_table");
DBUG_ASSERT (table_list->lock_type != TL_WRITE_DEFAULT);
/* find a unused table in the open table cache */
if (refresh)
*refresh=0;
@ -2667,6 +2668,12 @@ int open_tables(THD *thd, TABLE_LIST **start, uint *counter, uint flags)
for (tables= *start; tables ;tables= tables->next_global)
{
safe_to_ignore_table= FALSE; // 'FALSE', as per coding style
if (tables->lock_type == TL_WRITE_DEFAULT)
{
tables->lock_type= thd->update_lock_default;
DBUG_ASSERT (tables->lock_type >= TL_WRITE_ALLOW_WRITE);
}
/*
Ignore placeholders for derived tables. After derived tables
processing, link to created temporary table will be put here.