From 8aca59fa32b33c424c0375fa64cb48d2d50dab96 Mon Sep 17 00:00:00 2001
From: Nils Dijk <nils@citusdata.com>
Date: Fri, 23 Oct 2020 15:35:43 +0200
Subject: [PATCH] don't send unnecessary cancels

---
 src/backend/distributed/connection/remote_commands.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/backend/distributed/connection/remote_commands.c b/src/backend/distributed/connection/remote_commands.c
index da484a13b..6e3fa3081 100644
--- a/src/backend/distributed/connection/remote_commands.c
+++ b/src/backend/distributed/connection/remote_commands.c
@@ -1042,6 +1042,12 @@ SendCancelationRequest(MultiConnection *connection)
 {
 	char errorBuffer[ERROR_BUFFER_SIZE] = { 0 };
 
+	if (!PQisBusy(connection->pgConn))
+	{
+		/* no statement in progress, nothing to cancel */
+		return false;
+	}
+
 	PGcancel *cancelObject = PQgetCancel(connection->pgConn);
 	if (cancelObject == NULL)
 	{