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| author | Robert Haas <rhaas@postgresql.org> | 2017-10-27 16:04:01 +0200 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2017-10-27 16:04:01 +0200 |
| commit | 639c1a6bb9ee08fe4757a6fab1ddbd01291515e1 (patch) | |
| tree | 67f3bce3cad068c18ecb4132fa1ac04d150a9f41 /src/backend/executor/nodeGather.c | |
| parent | 820c0305f64507490f00b6220f9175a303c821dd (diff) | |
| download | postgresql-639c1a6bb9ee08fe4757a6fab1ddbd01291515e1.tar.gz postgresql-639c1a6bb9ee08fe4757a6fab1ddbd01291515e1.zip | |
Fix mistaken failure to allow parallelism in corner case.
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
Diffstat (limited to 'src/backend/executor/nodeGather.c')
| -rw-r--r-- | src/backend/executor/nodeGather.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/executor/nodeGather.c b/src/backend/executor/nodeGather.c index 8370037c433..639f4f5af88 100644 --- a/src/backend/executor/nodeGather.c +++ b/src/backend/executor/nodeGather.c @@ -150,7 +150,7 @@ ExecGather(PlanState *pstate) * Sometimes we might have to run without parallelism; but if parallel * mode is active then we can try to fire up some workers. */ - if (gather->num_workers > 0 && IsInParallelMode()) + if (gather->num_workers > 0 && estate->es_use_parallel_mode) { ParallelContext *pcxt; |