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Fix possible failures when a tuplestore switches from in-memory to on-disk

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mode while callers hold pointers to in-memory tuples.  I reported this for
the case of nodeWindowAgg's primary scan tuple, but inspection of the code
shows that all of the calls in nodeWindowAgg and nodeCtescan are at risk.
For the moment, fix it with a rather brute-force approach of copying
whenever one of the at-risk callers requests a tuple.  Later we might
think of some sort of reference-count approach to reduce tuple copying.
This commit is contained in:
Tom Lane
2009-03-27 18:30:21 +00:00
parent a95307b639
commit 25bf7f8b9b
10 changed files with 53 additions and 25 deletions
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6
src/backend/executor/functions.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/functions.c,v 1.132 2009/01/02 20:42:00 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/functions.c,v 1.133 2009/03/27 18:30:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -736,7 +736,7 @@ fmgr_sql(PG_FUNCTION_ARGS)
/* Re-use the junkfilter's output slot to fetch back the tuple */
Assert(fcache->junkFilter);
slot = fcache->junkFilter->jf_resultSlot;
if (!tuplestore_gettupleslot(fcache->tstore, true, slot))
if (!tuplestore_gettupleslot(fcache->tstore, true, false, slot))
elog(ERROR, "failed to fetch lazy-eval tuple");
/* Extract the result as a datum, and copy out from the slot */
result = postquel_get_single_result(slot, fcinfo,
@ -822,7 +822,7 @@ fmgr_sql(PG_FUNCTION_ARGS)
{
/* Re-use the junkfilter's output slot to fetch back the tuple */
slot = fcache->junkFilter->jf_resultSlot;
if (tuplestore_gettupleslot(fcache->tstore, true, slot))
if (tuplestore_gettupleslot(fcache->tstore, true, false, slot))
result = postquel_get_single_result(slot, fcinfo,
fcache, oldcontext);
else