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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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4
src/backend/commands/createas.c
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@ -326,8 +326,8 @@ ExecCreateTableAs(CreateTableAsStmt *stmt, const char *queryString,
query = linitial_node(Query, rewritten);
Assert(query->commandType == CMD_SELECT);
/* plan the query --- note we disallow parallelism */
plan = pg_plan_query(query, 0, params);
/* plan the query */
plan = pg_plan_query(query, CURSOR_OPT_PARALLEL_OK, params);
/*
* Use a snapshot with an updated command ID to ensure this query sees