From 5f5f7b4fe097163e58b510dae7075b3e9c0e97de Mon Sep 17 00:00:00 2001
From: Marco Slot <marco.slot@gmail.com>
Date: Sun, 6 May 2018 17:36:40 +0200
Subject: [PATCH] Throw an error if placements cannot be found in router
 executor

---
 src/backend/distributed/executor/multi_router_executor.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/backend/distributed/executor/multi_router_executor.c b/src/backend/distributed/executor/multi_router_executor.c
index 5face47b8..53a0083e2 100644
--- a/src/backend/distributed/executor/multi_router_executor.c
+++ b/src/backend/distributed/executor/multi_router_executor.c
@@ -628,6 +628,13 @@ ExecuteSingleSelectTask(CitusScanState *scanState, Task *task)
 			placementAccessList = list_make1(placementAccess);
 		}
 
+		if (placementAccessList == NIL)
+		{
+			ereport(ERROR, (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
+							errmsg("a placement was moved after the SELECT was "
+								   "planned")));
+		}
+
 		connection = GetPlacementListConnection(connectionFlags, placementAccessList,
 												NULL);