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commit    86c6aaff6ead3e00a89fd0743195678bbc69790c
Author:   Robert Haas <rhaas@postgresql.org>
Date:     Thu Dec 08 19:59:46 2016 +0000
First released in: 10.0, 9.6.2

    Fix bogus comment.
    
    Commit 4212cb73262bbdd164727beffa4c4744b4ead92d rendered a comment
    in execMain.c incorrect.  Per complaint from Tom Lane, repair.
    
    Patch from Amit Kapila, per wording suggested by Tom Lane and me.


 src/backend/executor/execMain.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index 71c07288a19..d406ee97832 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -1540,9 +1540,10 @@ ExecutePlan(EState *estate,
 	estate->es_direction = direction;
 
 	/*
-	 * If a tuple count was supplied or data is being written to relation, we
-	 * must force the plan to run without parallelism, because we might exit
-	 * early.
+	 * If a tuple count was supplied, we must force the plan 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.
 	 */
 	if (numberTuples || dest->mydest == DestIntoRel)
 		use_parallel_mode = false;


[parent: 1ed3c6ff9ef4]