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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/explain.c
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@ -396,8 +396,6 @@ ExplainOneUtility(Node *utilityStmt, IntoClause *into, ExplainState *es,
* We have to rewrite the contained SELECT and then pass it back to
* ExplainOneQuery. It's probably not really necessary to copy the
* contained parsetree another time, but let's be safe.
*
* Like ExecCreateTableAs, disallow parallelism in the plan.
*/
CreateTableAsStmt *ctas = (CreateTableAsStmt *) utilityStmt;
List *rewritten;
@ -405,7 +403,7 @@ ExplainOneUtility(Node *utilityStmt, IntoClause *into, ExplainState *es,
rewritten = QueryRewrite(castNode(Query, copyObject(ctas->query)));
Assert(list_length(rewritten) == 1);
ExplainOneQuery(linitial_node(Query, rewritten),
0, ctas->into, es,
CURSOR_OPT_PARALLEL_OK, ctas->into, es,
queryString, params, queryEnv);
}
else if (IsA(utilityStmt, DeclareCursorStmt))