From: Robert Haas <rhaas@postgresql.org>
Date: Fri, 26 Feb 2016 11:03:37 +0000 (+0530)
Subject: On second thought, disable parallelism for prepared statements.
X-Git-Tag: REL9_6_BETA1~648
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7bea19d0a9d3e6975418ffe685fb510bd31ab434;p=postgresql

On second thought, disable parallelism for prepared statements.

CREATE TABLE .. AS EXECUTE can turn an apparently read-only query into
a write operation, which parallel query can't handle.  It's a bit of a
shame that requires us to avoid parallel query for queries prepared via
PREPARE in all cases, but for right now it does.
---

diff --git a/src/backend/commands/prepare.c b/src/backend/commands/prepare.c
index b01051df9d..cec37ce040 100644
--- a/src/backend/commands/prepare.c
+++ b/src/backend/commands/prepare.c
@@ -159,7 +159,7 @@ PrepareQuery(PrepareStmt *stmt, const char *queryString)
 					   nargs,
 					   NULL,
 					   NULL,
-					   CURSOR_OPT_PARALLEL_OK,	/* allow parallel mode */
+					   0,		/* default cursor options */
 					   true);	/* fixed result */
 
 	/*