Fix the just-reported problem that you can't specify all four trigger event

types in CREATE TRIGGER.  While at it, clean up the amazingly tedious and
inextensible way that the trigger event type list was handled.  Per report
from Greg Sabino Mullane.

Author: tglsfdc

src/backend/commands/tablecmds.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.287 2009/06/11 20:46:11 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.288 2009/06/18 01:27:02 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -5206,14 +5206,13 @@ CreateFKCheckTrigger(RangeVar *myRel, FkConstraint *fkconstraint,
 	if (on_insert)
 	{
 		fk_trigger->funcname = SystemFuncName("RI_FKey_check_ins");
-		fk_trigger->actions[0] = 'i';
+		fk_trigger->events = TRIGGER_TYPE_INSERT;
 	}
 	else
 	{
 		fk_trigger->funcname = SystemFuncName("RI_FKey_check_upd");
-		fk_trigger->actions[0] = 'u';
+		fk_trigger->events = TRIGGER_TYPE_UPDATE;
 	}
-	fk_trigger->actions[1] = '\0';
 
 	fk_trigger->isconstraint = true;
 	fk_trigger->deferrable = fkconstraint->deferrable;
@@ -5263,9 +5262,7 @@ createForeignKeyTriggers(Relation rel, FkConstraint *fkconstraint,
 	fk_trigger->relation = fkconstraint->pktable;
 	fk_trigger->before = false;
 	fk_trigger->row = true;
-	fk_trigger->actions[0] = 'd';
-	fk_trigger->actions[1] = '\0';
-
+	fk_trigger->events = TRIGGER_TYPE_DELETE;
 	fk_trigger->isconstraint = true;
 	fk_trigger->constrrel = myRel;
 	switch (fkconstraint->fk_del_action)
@@ -5316,8 +5313,7 @@ createForeignKeyTriggers(Relation rel, FkConstraint *fkconstraint,
 	fk_trigger->relation = fkconstraint->pktable;
 	fk_trigger->before = false;
 	fk_trigger->row = true;
-	fk_trigger->actions[0] = 'u';
-	fk_trigger->actions[1] = '\0';
+	fk_trigger->events = TRIGGER_TYPE_UPDATE;
 	fk_trigger->isconstraint = true;
 	fk_trigger->constrrel = myRel;
 	switch (fkconstraint->fk_upd_action)

src/backend/commands/trigger.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.247 2009/06/11 14:48:56 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.248 2009/06/18 01:27:02 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -100,7 +100,6 @@ CreateTrigger(CreateTrigStmt *stmt, Oid constraintOid, bool checkPermissions)
 	Oid			funcoid;
 	Oid			funcrettype;
 	Oid			trigoid;
-	int			i;
 	char		constrtrigname[NAMEDATALEN];
 	char	   *trigname;
 	char	   *constrname;
@@ -150,50 +149,13 @@ CreateTrigger(CreateTrigStmt *stmt, Oid constraintOid, bool checkPermissions)
 		TRIGGER_SETT_BEFORE(tgtype);
 	if (stmt->row)
 		TRIGGER_SETT_ROW(tgtype);
+	tgtype |= stmt->events;
 
-	for (i = 0; stmt->actions[i]; i++)
-	{
-		switch (stmt->actions[i])
-		{
-			case 'i':
-				if (TRIGGER_FOR_INSERT(tgtype))
-					ereport(ERROR,
-							(errcode(ERRCODE_SYNTAX_ERROR),
-							 errmsg("multiple INSERT events specified")));
-				TRIGGER_SETT_INSERT(tgtype);
-				break;
-			case 'd':
-				if (TRIGGER_FOR_DELETE(tgtype))
-					ereport(ERROR,
-							(errcode(ERRCODE_SYNTAX_ERROR),
-							 errmsg("multiple DELETE events specified")));
-				TRIGGER_SETT_DELETE(tgtype);
-				break;
-			case 'u':
-				if (TRIGGER_FOR_UPDATE(tgtype))
-					ereport(ERROR,
-							(errcode(ERRCODE_SYNTAX_ERROR),
-							 errmsg("multiple UPDATE events specified")));
-				TRIGGER_SETT_UPDATE(tgtype);
-				break;
-			case 't':
-				if (TRIGGER_FOR_TRUNCATE(tgtype))
-					ereport(ERROR,
-							(errcode(ERRCODE_SYNTAX_ERROR),
-							 errmsg("multiple TRUNCATE events specified")));
-				TRIGGER_SETT_TRUNCATE(tgtype);
-				/* Disallow ROW-level TRUNCATE triggers */
-				if (stmt->row)
-					ereport(ERROR,
-							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-							 errmsg("TRUNCATE FOR EACH ROW triggers are not supported")));
-				break;
-			default:
-				elog(ERROR, "unrecognized trigger event: %d",
-					 (int) stmt->actions[i]);
-				break;
-		}
-	}
+	/* Disallow ROW-level TRUNCATE triggers */
+	if (TRIGGER_FOR_ROW(tgtype) && TRIGGER_FOR_TRUNCATE(tgtype))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("TRUNCATE FOR EACH ROW triggers are not supported")));
 
 	/*
 	 * Find and validate the trigger function.

src/backend/nodes/copyfuncs.c

@@ -15,7 +15,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.431 2009/06/11 14:48:58 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.432 2009/06/18 01:27:02 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -3081,7 +3081,7 @@ _copyCreateTrigStmt(CreateTrigStmt *from)
 	COPY_NODE_FIELD(args);
 	COPY_SCALAR_FIELD(before);
 	COPY_SCALAR_FIELD(row);
-	strcpy(newnode->actions, from->actions);	/* in-line string field */
+	COPY_SCALAR_FIELD(events);
 	COPY_SCALAR_FIELD(isconstraint);
 	COPY_SCALAR_FIELD(deferrable);
 	COPY_SCALAR_FIELD(initdeferred);

src/backend/nodes/equalfuncs.c

@@ -22,7 +22,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.354 2009/06/11 14:48:58 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.355 2009/06/18 01:27:02 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1639,8 +1639,7 @@ _equalCreateTrigStmt(CreateTrigStmt *a, CreateTrigStmt *b)
 	COMPARE_NODE_FIELD(args);
 	COMPARE_SCALAR_FIELD(before);
 	COMPARE_SCALAR_FIELD(row);
-	if (strcmp(a->actions, b->actions) != 0)	/* in-line string field */
-		return false;
+	COMPARE_SCALAR_FIELD(events);
 	COMPARE_SCALAR_FIELD(isconstraint);
 	COMPARE_SCALAR_FIELD(deferrable);
 	COMPARE_SCALAR_FIELD(initdeferred);

src/backend/parser/gram.y

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.664 2009/05/27 20:42:29 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.665 2009/06/18 01:27:02 tgl Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -53,6 +53,7 @@
 
 #include "catalog/index.h"
 #include "catalog/namespace.h"
+#include "catalog/pg_trigger.h"
 #include "commands/defrem.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
@@ -244,7 +245,7 @@ static TypeName *TableFuncTypeName(List *columns);
 %type <boolean> TriggerActionTime TriggerForSpec opt_trusted opt_restart_seqs
 %type <str>		opt_lancompiler
 
-%type <str>		TriggerEvents
+%type <ival>	TriggerEvents TriggerOneEvent
 %type <value>	TriggerFuncArg
 
 %type <str>		relation_name copy_file_name
@@ -266,7 +267,6 @@ static TypeName *TableFuncTypeName(List *columns);
 %type <privtarget> privilege_target
 %type <funwithargs> function_with_argtypes
 %type <list>	function_with_argtypes_list
-%type <chr> 	TriggerOneEvent
 
 %type <list>	stmtblock stmtmulti
 				OptTableElementList TableElementList OptInherit definition
@@ -3133,7 +3133,7 @@ CreateTrigStmt:
 					n->args = $13;
 					n->before = $4;
 					n->row = $8;
-					memcpy(n->actions, $5, 4);
+					n->events = $5;
 					n->isconstraint  = FALSE;
 					n->deferrable	 = FALSE;
 					n->initdeferred  = FALSE;
@@ -3153,11 +3153,10 @@ CreateTrigStmt:
 					n->args = $18;
 					n->before = FALSE;
 					n->row = TRUE;
-					memcpy(n->actions, $6, 4);
+					n->events = $6;
 					n->isconstraint  = TRUE;
 					n->deferrable = ($10 & 1) != 0;
 					n->initdeferred = ($10 & 2) != 0;
-
 					n->constrrel = $9;
 					$$ = (Node *)n;
 				}
@@ -3170,30 +3169,20 @@ TriggerActionTime:
 
 TriggerEvents:
 			TriggerOneEvent
+				{ $$ = $1; }
+			| TriggerEvents OR TriggerOneEvent
 				{
-					char *e = palloc(4);
-					e[0] = $1; e[1] = '\0';
-					$$ = e;
-				}
-			| TriggerOneEvent OR TriggerOneEvent
-				{
-					char *e = palloc(4);
-					e[0] = $1; e[1] = $3; e[2] = '\0';
-					$$ = e;
-				}
-			| TriggerOneEvent OR TriggerOneEvent OR TriggerOneEvent
-				{
-					char *e = palloc(4);
-					e[0] = $1; e[1] = $3; e[2] = $5; e[3] = '\0';
-					$$ = e;
+					if ($1 & $3)
+						yyerror("duplicate trigger events specified");
+					$$ = $1 | $3;
 				}
 		;
 
 TriggerOneEvent:
-			INSERT									{ $$ = 'i'; }
-			| DELETE_P								{ $$ = 'd'; }
-			| UPDATE								{ $$ = 'u'; }
-			| TRUNCATE								{ $$ = 't'; }
+			INSERT								{ $$ = TRIGGER_TYPE_INSERT; }
+			| DELETE_P							{ $$ = TRIGGER_TYPE_DELETE; }
+			| UPDATE							{ $$ = TRIGGER_TYPE_UPDATE; }
+			| TRUNCATE							{ $$ = TRIGGER_TYPE_TRUNCATE; }
 		;
 
 TriggerForSpec:

src/include/nodes/parsenodes.h

@@ -13,7 +13,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.394 2009/06/11 14:49:11 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.395 2009/06/18 01:27:02 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1551,7 +1551,8 @@ typedef struct CreateTrigStmt
 	List	   *args;			/* list of (T_String) Values or NIL */
 	bool		before;			/* BEFORE/AFTER */
 	bool		row;			/* ROW/STATEMENT */
-	char		actions[4];		/* 1 to 3 of 'i', 'u', 'd', + trailing \0 */
+	/* events uses the TRIGGER_TYPE bits defined in catalog/pg_trigger.h */
+	int16		events;			/* INSERT/UPDATE/DELETE/TRUNCATE */
 
 	/* The following are used for referential */
 	/* integrity constraint triggers */