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Allow DML commands that create tables to use parallel query.

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Haribabu Kommi, reviewed by Dilip Kumar and Rafia Sabih.  Various
cosmetic changes by me to explain why this appears to be safe but
allowing inserts in parallel mode in general wouldn't be.  Also, I
removed the REFRESH MATERIALIZED VIEW case from Haribabu's patch,
since I'm not convinced that case is OK, and hacked on the
documentation somewhat.

Discussion: http://postgr.es/m/CAJrrPGdo5bak6qnPWe8Kpi8g_jfQEs-G4SYmG9y+OFaw2-dPvA@mail.gmail.com
This commit is contained in:
Robert Haas
2017-10-05 11:34:38 -04:00
parent 4d85c2900b
commit e9baa5e9fa
10 changed files with 150 additions and 27 deletions
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6
src/backend/executor/execMain.c
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@ -1697,11 +1697,9 @@ ExecutePlan(EState *estate,
/*
* If the plan might potentially be executed multiple times, we must force
* it to run without parallelism, because we might exit early. Also
* disable parallelism when writing into a relation, because no database
* changes are allowed in parallel mode.
* it to run without parallelism, because we might exit early.
*/
if (!execute_once || dest->mydest == DestIntoRel)
if (!execute_once)
use_parallel_mode = false;
if (use_parallel_mode)