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Bug#53933 crash when using uncacheable subquery in the having clause of outer query

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The problem is in the Item_func_isnull::update_used_tables() function,
bracket is at the wrong place. Because of that isnull item erroneously
is treated as const item. The fix is to set brackets in the right place.
This commit is contained in:
Sergey Glukhov
2010-06-08 10:22:40 +04:00
parent 80acd9573f
commit bc774bd332
3 changed files with 31 additions and 2 deletions
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4
sql/item_cmpfunc.h
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@ -1209,8 +1209,8 @@ public:
else
{
args[0]->update_used_tables();
if ((const_item_cache= !(used_tables_cache= args[0]->used_tables())) &&
!with_subselect)
if ((const_item_cache= !(used_tables_cache= args[0]->used_tables()) &&
!with_subselect))
{
/* Remember if the value is always NULL or never NULL */
cached_value= (longlong) args[0]->is_null();