From 9b12e275cd0b42c2cc4f65b8f6dd771d394bbba7 Mon Sep 17 00:00:00 2001
From: Pavan Deolasee
Date: Thu, 18 May 2017 10:22:31 +0530
Subject: Ensure that multi-node executor is initialised correctly.

Since parallel background worker threads may need to communicate with remote
nodes, we should initialise multi-node executor when the parallel worker starts
it work. This was discovered while running queries with force_parallel_mode set
to on.
---
 src/backend/access/transam/parallel.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/backend/access/transam/parallel.c b/src/backend/access/transam/parallel.c
index a47eba647b..3c0da2e1e0 100644
--- a/src/backend/access/transam/parallel.c
+++ b/src/backend/access/transam/parallel.c
@@ -1008,6 +1008,11 @@ ParallelWorkerMain(Datum main_arg)
 	BackgroundWorkerInitializeConnectionByOid(fps->database_id,
 											  fps->authenticated_user_id);
 
+	StartTransactionCommand();
+	/* Initialize XL executor. This must be done inside a transaction block. */
+	InitMultinodeExecutor(false);
+	CommitTransactionCommand();
+
 	/*
 	 * Set the client encoding to the database encoding, since that is what
 	 * the leader will expect.
-- 
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