Improved trigger query for PG 9.5

Former-commit-id: 9dd548f

Author: joncrlsn

trigger.go

@@ -105,19 +105,13 @@ func (c TriggerSchema) Change(obj interface{}) {
 // compareTriggers outputs SQL to make the triggers match between DBs
 func compareTriggers(conn1 *sql.DB, conn2 *sql.DB) {
 	sql := `
-    SELECT tbl.nspname || '.' || tbl.relname AS table_name
-    	, t.tgname AS trigger_name
-    	, pg_catalog.pg_get_triggerdef(t.oid, true) AS definition
-    	, t.tgenabled AS enabled
+    SELECT n.nspname || '.' || c.relname AS table_name
+       , t.tgname AS trigger_name
+       , pg_catalog.pg_get_triggerdef(t.oid, true) AS definition
+       , t.tgenabled AS enabled
     FROM pg_catalog.pg_trigger t
-    INNER JOIN (
-    	SELECT c.oid, n.nspname, c.relname
-    	FROM pg_catalog.pg_class c
-    	JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace AND n.nspname NOT LIKE 'pg_%')
-    	WHERE pg_catalog.pg_table_is_visible(c.oid)) AS tbl
-    	ON (tbl.oid = t.tgrelid)
-    AND NOT t.tgisinternal
-    ORDER BY 1;
+    INNER JOIN pg_catalog.pg_class c ON (c.oid = t.tgrelid)
+    INNER JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace AND n.nspname NOT LIKE 'pg_%');
 	`
 
 	rowChan1, _ := pgutil.QueryStrings(conn1, sql)