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
Branch
------
REL9_6_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/036b6bd50365b9ae6ec0b4cb21d172510ef440a9
Modified Files
--------------
src/backend/executor/execMain.c | 5 +----
src/backend/executor/execUtils.c | 2 ++
src/backend/executor/nodeGather.c | 2 +-
src/include/nodes/execnodes.h | 2 ++
4 files changed, 6 insertions(+), 5 deletions(-)
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