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Bug #55472: Assertion failed in heap_rfirst function of hp_rfirst.c on

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DELETE statement

Single-table delete ordered by a field that has a hash-type index
may cause an assertion failure or a crash.

An optimization added by the fix for the bug 36569 forced the
optimizer to use ORDER BY-compatible indices when applicable.

However, the existence of unsorted indices (HASH index algorithm
for some engines such as MEMORY/HEAP, NDB) was ignored.

The test_if_order_by_key function has been modified to skip
unsorted indices.
This commit is contained in:
Gleb Shchepa
2010-07-29 01:02:43 +04:00
parent ed434ce045
commit 95ec38c5b1
3 changed files with 29 additions and 1 deletions
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2
sql/sql_select.cc
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@ -13244,7 +13244,7 @@ static int test_if_order_by_key(ORDER *order, TABLE *table, uint idx,
DBUG_RETURN(0);
}
if (key_part->field != field)
if (key_part->field != field || !field->part_of_sortkey.is_set(idx))
DBUG_RETURN(0);
/* set flag to 1 if we can use read-next on key, else to -1 */