Fix Crash when Instead of View Trigger calls itself (#245)

This change will fix crashes when an
Instead of Trigger on View calls itself directly and indirectly

Task: BABEL-2170

src/backend/commands/trigger.c

@@ -70,6 +70,7 @@ int			SessionReplicationRole = SESSION_REPLICATION_ROLE_ORIGIN;
 
 /* How many levels deep into trigger execution are we? */
 static int	MyTriggerDepth = 0;
+List *triggerOids = NIL; /* To store all trigger calls information */
 
 /* Local function prototypes */
 static void renametrig_internal(Relation tgrel, Relation targetrel,
@@ -2571,11 +2572,13 @@ ExecCallTriggerFunc(TriggerData *trigdata,
 	MyTriggerDepth++;
 	PG_TRY();
 	{
+		triggerOids = lappend_oid(triggerOids, trigdata->tg_trigger->tgoid);
 		result = FunctionCallInvoke(fcinfo);
 	}
 	PG_FINALLY();
 	{
 		MyTriggerDepth--;
+		triggerOids = list_delete_oid(triggerOids, trigdata->tg_trigger->tgoid);
 	}
 	PG_END_TRY();
 

src/backend/rewrite/rewriteHandler.c

@@ -3736,7 +3736,8 @@ RewriteQuery(Query *parsetree, List *rewrite_events, int orig_rt_length)
 		result_relation = parsetree->resultRelation;
 		Assert(result_relation != 0);
 		rt_entry = rt_fetch(result_relation, parsetree->rtable);
-		Assert(rt_entry->rtekind == RTE_RELATION);
+		/** allow transition table in TSQL inside trigger body, rtekind can be RTE_NAMEDTUPLESTORE, eg inserted and deleted*/
+		Assert(rt_entry->rtekind == RTE_RELATION || (sql_dialect == SQL_DIALECT_TSQL && rt_entry->rtekind == RTE_NAMEDTUPLESTORE));
 
 		/*
 		 * We can use NoLock here since either the parser or

src/include/commands/trigger.h

@@ -309,6 +309,7 @@ extern void AfterTriggerEndSubXact(bool isCommit);
 extern void AfterTriggerSetState(ConstraintsSetStmt *stmt);
 extern bool AfterTriggerPendingOnRel(Oid relid);
 
+extern List *triggerOids; /* To store all trigger calls information */
 
 /*
  * in utils/adt/ri_triggers.c