Fix mishandling of CreateEventTrigStmt's eventname field.

It's a string, not a scalar.

Petr Jelinek

src/backend/nodes/copyfuncs.c

@@ -3611,7 +3611,7 @@ _copyCreateEventTrigStmt(const CreateEventTrigStmt *from)
 	CreateEventTrigStmt *newnode = makeNode(CreateEventTrigStmt);
 
 	COPY_STRING_FIELD(trigname);
-	COPY_SCALAR_FIELD(eventname);
+	COPY_STRING_FIELD(eventname);
 	COPY_NODE_FIELD(whenclause);
 	COPY_NODE_FIELD(funcname);
 

src/backend/nodes/equalfuncs.c

@@ -1806,7 +1806,7 @@ static bool
 _equalCreateEventTrigStmt(const CreateEventTrigStmt *a, const CreateEventTrigStmt *b)
 {
 	COMPARE_STRING_FIELD(trigname);
-	COMPARE_SCALAR_FIELD(eventname);
+	COMPARE_STRING_FIELD(eventname);
 	COMPARE_NODE_FIELD(funcname);
 	COMPARE_NODE_FIELD(whenclause);