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Fix mistaken failure to allow parallelism in corner case.

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If we try to run a parallel plan in serial mode because, for example,
it's going to be scanned via a cursor, but for some reason we're
already in parallel mode (for example because an outer query is
running in parallel), we'd incorrectly try to launch workers.
Fix by adding a flag to the EState, so that we can be certain that
ExecutePlan() and ExecGather()/ExecGatherMerge() will have the same
idea about whether we are executing serially or in parallel.

Report and fix by Amit Kapila with help from Kuntal Ghosh.  A few
tweaks by me.

Discussion: http://postgr.es/m/CAA4eK1+_BuZrmVCeua5Eqnm4Co9DAXdM5HPAOE2J19ePbR912Q@mail.gmail.com
This commit is contained in:
Robert Haas
2017-10-27 16:04:01 +02:00
parent 820c0305f6
commit 639c1a6bb9
5 changed files with 7 additions and 2 deletions
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2
src/backend/executor/execUtils.c
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@ -156,6 +156,8 @@ CreateExecutorState(void)
estate->es_epqScanDone = NULL;
estate->es_sourceText = NULL;
estate->es_use_parallel_mode = false;
/*
* Return the executor state structure
*/