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BUG#5390 - problems with merge tables

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Additional fix for INSERT DELAYED with subselect.
Originally detected in 5.1, but 5.0 could also be affected.
The user thread creates a dummy table object,
which is not included in the lock. The 'real' table is
opened and locked by the 'delayed' system thread.
The dummy object is now marked as not locked and this is
tested in mysql_lock_have_duplicate().


sql/lock.cc:
  BUG#5390 - problems with merge tables
  Additional fix for INSERT DELAYED with subselect.
  The user thread creates a dummy table object,
  which is not included in the lock.
  Changed to safer asserts.
sql/sql_insert.cc:
  BUG#5390 - problems with merge tables
  Marked the dummy table object as not being
  included in the lock.
This commit is contained in:
unknown 2006-04-05 14:39:20 +02:00
commit 23549493aa
2 changed files with 13 additions and 5 deletions
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13
sql/lock.cc
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@ -530,8 +530,11 @@ TABLE_LIST *mysql_lock_have_duplicate(THD *thd, TABLE_LIST *needle,
THR_LOCK_DATA **end_data2;
DBUG_ENTER("mysql_lock_have_duplicate");
/* Table may not be defined for derived or view tables. */
if (! (table= needle->table))
/*
Table may not be defined for derived or view tables.
Table may not be part of a lock for delayed operations.
*/
if (! (table= needle->table) || ! table->lock_count)
goto end;
/* A temporary table does not have locks. */
@ -550,7 +553,8 @@ TABLE_LIST *mysql_lock_have_duplicate(THD *thd, TABLE_LIST *needle,
lock_tables= mylock->table;
/* Prepare table related variables that don't change in loop. */
DBUG_ASSERT(table == lock_tables[table->lock_position]);
DBUG_ASSERT((table->lock_position < mylock->table_count) &&
(table == lock_tables[table->lock_position]));
table_lock_data= lock_locks + table->lock_data_start;
end_data= table_lock_data + table->lock_count;
@ -563,7 +567,8 @@ TABLE_LIST *mysql_lock_have_duplicate(THD *thd, TABLE_LIST *needle,
continue;
/* All tables in list must be in lock. */
DBUG_ASSERT(table2 == lock_tables[table2->lock_position]);
DBUG_ASSERT((table2->lock_position < mylock->table_count) &&
(table2 == lock_tables[table2->lock_position]));
for (lock_data2= lock_locks + table2->lock_data_start,
end_data2= lock_data2 + table2->lock_count;