From b197a603f0c71d43e45ff518ea85c7f211bb1b8a Mon Sep 17 00:00:00 2001
From: Jelte Fennema <github-tech@jeltef.nl>
Date: Tue, 7 Jul 2020 17:20:21 +0200
Subject: [PATCH] Fix divide by zero error

---
 src/backend/distributed/planner/multi_physical_planner.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/backend/distributed/planner/multi_physical_planner.c b/src/backend/distributed/planner/multi_physical_planner.c
index 955fca0b0..df8c4ec9b 100644
--- a/src/backend/distributed/planner/multi_physical_planner.c
+++ b/src/backend/distributed/planner/multi_physical_planner.c
@@ -2107,7 +2107,7 @@ BuildMapMergeJob(Query *jobQuery, List *dependentJobList, Var *partitionKey,
 static uint32
 HashPartitionCount(void)
 {
-	uint32 groupCount = ActiveReadableWorkerNodeCount();
+	uint32 groupCount = list_length(ActiveReadableNodeList());
 	double maxReduceTasksPerNode = MaxRunningTasksPerNode / 2.0;
 
 	uint32 partitionCount = (uint32) rint(groupCount * maxReduceTasksPerNode);
@@ -5717,7 +5717,7 @@ AssignDualHashTaskList(List *taskList)
 	 * if subsequent jobs have a small number of tasks, we won't allocate the
 	 * tasks to the same worker repeatedly.
 	 */
-	List *workerNodeList = ActiveReadableWorkerNodeList();
+	List *workerNodeList = ActiveReadableNodeList();
 	uint32 workerNodeCount = (uint32) list_length(workerNodeList);
 	uint32 beginningNodeIndex = jobId % workerNodeCount;