Fix relcache leak when row triggers on partitions are fired by COPY.

Thomas Munro, reviewed by Amit Langote

Discussion: http://postgr.es/m/CAEepm=15Jss-yhFApuKzxcoCuFnb8TR8iQiWMjG=CLYPx48QLw@mail.gmail.com

src/backend/commands/copy.c

@@ -2773,6 +2773,9 @@ CopyFrom(CopyState cstate)
 		ExecDropSingleTupleTableSlot(cstate->partition_tuple_slot);
 	}
 
+	/* Close any trigger target relations */
+	ExecCleanUpTriggerState(estate);
+
 	FreeExecutorState(estate);
 
 	/*

src/backend/commands/trigger.c

@@ -4110,16 +4110,7 @@ afterTriggerInvokeEvents(AfterTriggerEventList *events,
 
 	if (local_estate)
 	{
-		ListCell   *l;
-
-		foreach(l, estate->es_trig_target_relations)
-		{
-			ResultRelInfo *resultRelInfo = (ResultRelInfo *) lfirst(l);
-
-			/* Close indices and then the relation itself */
-			ExecCloseIndices(resultRelInfo);
-			heap_close(resultRelInfo->ri_RelationDesc, NoLock);
-		}
+		ExecCleanUpTriggerState(estate);
 		FreeExecutorState(estate);
 	}
 

src/backend/executor/execMain.c

@@ -1446,6 +1446,24 @@ ExecGetTriggerResultRel(EState *estate, Oid relid)
 	return rInfo;
 }
 
+/*
+ * Close any relations that have been opened by ExecGetTriggerResultRel().
+ */
+void
+ExecCleanUpTriggerState(EState *estate)
+{
+	ListCell   *l;
+
+	foreach(l, estate->es_trig_target_relations)
+	{
+		ResultRelInfo *resultRelInfo = (ResultRelInfo *) lfirst(l);
+
+		/* Close indices and then the relation itself */
+		ExecCloseIndices(resultRelInfo);
+		heap_close(resultRelInfo->ri_RelationDesc, NoLock);
+	}
+}
+
 /*
  *		ExecContextForcesOids
  *
@@ -1610,16 +1628,8 @@ ExecEndPlan(PlanState *planstate, EState *estate)
 		resultRelInfo++;
 	}
 
-	/*
-	 * likewise close any trigger target relations
-	 */
-	foreach(l, estate->es_trig_target_relations)
-	{
-		resultRelInfo = (ResultRelInfo *) lfirst(l);
-		/* Close indices and then the relation itself */
-		ExecCloseIndices(resultRelInfo);
-		heap_close(resultRelInfo->ri_RelationDesc, NoLock);
-	}
+	/* likewise close any trigger target relations */
+	ExecCleanUpTriggerState(estate);
 
 	/*
 	 * close any relations selected FOR [KEY] UPDATE/SHARE, again keeping
@@ -3173,14 +3183,7 @@ EvalPlanQualEnd(EPQState *epqstate)
 	ExecResetTupleTable(estate->es_tupleTable, false);
 
 	/* close any trigger target relations attached to this EState */
-	foreach(l, estate->es_trig_target_relations)
-	{
-		ResultRelInfo *resultRelInfo = (ResultRelInfo *) lfirst(l);
-
-		/* Close indices and then the relation itself */
-		ExecCloseIndices(resultRelInfo);
-		heap_close(resultRelInfo->ri_RelationDesc, NoLock);
-	}
+	ExecCleanUpTriggerState(estate);
 
 	MemoryContextSwitchTo(oldcontext);
 

src/include/executor/executor.h

@@ -184,6 +184,7 @@ extern void InitResultRelInfo(ResultRelInfo *resultRelInfo,
 				  Relation partition_root,
 				  int instrument_options);
 extern ResultRelInfo *ExecGetTriggerResultRel(EState *estate, Oid relid);
+extern void ExecCleanUpTriggerState(EState *estate);
 extern bool ExecContextForcesOids(PlanState *planstate, bool *hasoids);
 extern void ExecConstraints(ResultRelInfo *resultRelInfo,
 				TupleTableSlot *slot, EState *estate);

src/test/regress/expected/triggers.out

@@ -1882,4 +1882,14 @@ NOTICE:  trigger on parted2_stmt_trig AFTER UPDATE for STATEMENT
 delete from parted_stmt_trig;
 NOTICE:  trigger on parted_stmt_trig BEFORE DELETE for STATEMENT
 NOTICE:  trigger on parted_stmt_trig AFTER DELETE for STATEMENT
+-- insert via copy on the parent
+copy parted_stmt_trig(a) from stdin;
+NOTICE:  trigger on parted_stmt_trig BEFORE INSERT for STATEMENT
+NOTICE:  trigger on parted_stmt_trig1 BEFORE INSERT for ROW
+NOTICE:  trigger on parted_stmt_trig1 AFTER INSERT for ROW
+NOTICE:  trigger on parted_stmt_trig AFTER INSERT for STATEMENT
+-- insert via copy on the first partition
+copy parted_stmt_trig1(a) from stdin;
+NOTICE:  trigger on parted_stmt_trig1 BEFORE INSERT for ROW
+NOTICE:  trigger on parted_stmt_trig1 AFTER INSERT for ROW
 drop table parted_stmt_trig, parted2_stmt_trig;

src/test/regress/sql/triggers.sql

@@ -1347,4 +1347,16 @@ with upd as (
 ) update parted_stmt_trig  set a = a;
 
 delete from parted_stmt_trig;
+
+-- insert via copy on the parent
+copy parted_stmt_trig(a) from stdin;
+1
+2
+\.
+
+-- insert via copy on the first partition
+copy parted_stmt_trig1(a) from stdin;
+1
+\.
+
 drop table parted_stmt_trig, parted2_stmt_trig;