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MDEV-4056 fix.

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The problem was that maybe_null of Item_row and its componetes was unsynced after update_used_tables() (and so pushed_cond_guards was not initialized but then requested).

Fix  updates Item_row::maybe_null on update_used_tables().
This commit is contained in:
unknown 2013-01-16 21:07:26 +02:00
commit 2255132f20
3 changed files with 49 additions and 0 deletions
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2
sql/item_row.cc
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@ -139,11 +139,13 @@ void Item_row::update_used_tables()
{
used_tables_cache= 0;
const_item_cache= 1;
maybe_null= 0;
for (uint i= 0; i < arg_count; i++)
{
items[i]->update_used_tables();
used_tables_cache|= items[i]->used_tables();
const_item_cache&= items[i]->const_item();
maybe_null|= items[i]->maybe_null;
}
}