Fix thinko in ExecCleanupTupleRouting().

Commit 3f2393ed changed ExecCleanupTupleRouting() so that it skipped
cleaning up subplan resultrels before calling EndForeignInsert(), but
that would cause an issue: when those resultrels were foreign tables,
the FDWs would fail to shut down.  Repair by skipping it after calling
EndForeignInsert() as before.

Author: Etsuro Fujita
Reviewed-by: David Rowley and Amit Langote
Discussion: https://postgr.es/m/5CAF3B8F.2090905@lab.ntt.co.jp

src/backend/executor/execPartition.c

@@ -1126,6 +1126,12 @@ ExecCleanupTupleRouting(ModifyTableState *mtstate,
 	{
 		ResultRelInfo *resultRelInfo = proute->partitions[i];
 
+		/* Allow any FDWs to shut down */
+		if (resultRelInfo->ri_FdwRoutine != NULL &&
+			resultRelInfo->ri_FdwRoutine->EndForeignInsert != NULL)
+			resultRelInfo->ri_FdwRoutine->EndForeignInsert(mtstate->ps.state,
+														   resultRelInfo);
+
 		/*
 		 * Check if this result rel is one belonging to the node's subplans,
 		 * if so, let ExecEndPlan() clean it up.
@@ -1142,12 +1148,6 @@ ExecCleanupTupleRouting(ModifyTableState *mtstate,
 				continue;
 		}
 
-		/* Allow any FDWs to shut down if they've been exercised */
-		if (resultRelInfo->ri_FdwRoutine != NULL &&
-			resultRelInfo->ri_FdwRoutine->EndForeignInsert != NULL)
-			resultRelInfo->ri_FdwRoutine->EndForeignInsert(mtstate->ps.state,
-														   resultRelInfo);
-
 		ExecCloseIndices(resultRelInfo);
 		table_close(resultRelInfo->ri_RelationDesc, NoLock);
 	}