konstantin@mysql.com 8b0cee88f0 A fix and a test case for Bug#10736 "mysql_stmt_attr_set ...

CURSOR_TYPE_READ_ONLY select within select".
The bug was caused by the reset of thd->mem_root to thd->main_mem_root in 
Item_subselect::exec, which in turn triggered too early free_root() for
data which was needed on subsequent fetches from a cursor.
This reset also caused a memory leak in stored procedures, as 
subsequent executions of instructions containing a subselect
were allocating memory in thd->main_mem_root, which is not freed
until the end of the entire SP, instead of the per-call mem_root,
which is freed in the end of execution of the instruction.

2005-06-28 20:52:15 +04:00

44 KiB

Raw Blame History

View Raw