"Vadim Mikheev" <vmikheev@sectorbase.com> writes:
>> However, EvalPlanQual still leaks more memory than suits me ---
>> auxiliary memory allocated by the plan nodes is not recovered.
> Isn't plan shutdown supposed to free memory?
Yeah, but it leaks all over the place; none of the plan node types
bother to free their state nodes, for example. There are lots of other
cases. You really have to reset the per-query context to get rid of all
the cruft allocated during ExecInitNode.
> How subselects run queries again and again?
They don't end and restart them; they just rescan them. If we had
this substitute-a-new-tuple hack integrated into the Param mechanism,
then EvalPlanQual could use ExecReScan too, but at the moment no...
regards, tom lane