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Commit34aebcf

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Allow parallelism in COPY (query) TO ...;
Previously this was not allowed, as copy.c didn't set theCURSOR_OPT_PARALLEL_OK flag when planning the query. Set it.While the lack of parallel query for COPY isn't strictly speaking abug, it does prevent parallelism from being used in a facilitycommonly used to run long running queries. Thus backpatch to 9.6.Author: Andres FreundDiscussion:https://postgr.es/m/20170531231958.ihanapplorptykzm@alap3.anarazel.deBackpatch: 9.6, where parallelism was introduced.
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‎src/backend/commands/copy.c

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@@ -1527,7 +1527,7 @@ BeginCopy(ParseState *pstate,
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}
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/* plan the query */
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plan=pg_plan_query(query,0,NULL);
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plan=pg_plan_query(query,CURSOR_OPT_PARALLEL_OK,NULL);
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/*
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* With row level security and a user using "COPY relation TO", we

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