Fill in information schema column for trigger WHEN condition

diff --git a/doc/src/sgml/information_schema.sgml b/doc/src/sgml/information_schema.sgml
index 7ad2cc8c5c0a3d52be27643b09eb5e925c0a9626..ad945c2ea9f52ad083096500936825399624d9d6 100644 (file)
--- a/doc/src/sgml/information_schema.sgml
+++ b/doc/src/sgml/information_schema.sgml
@@ -1,4 +1,4 @@
-
+
 
 
  The Information Schema
@@ -4875,7 +4875,11 @@ ORDER BY c.ordinal_position;
      
       action_condition
       character_data
-      Applies to a feature not available in PostgreSQL
+      
+       WHEN condition of the trigger, null if none
+       (also null if the table is not owned by a currently enabled
+       role)
+      
      
 
      

diff --git a/src/backend/catalog/information_schema.sql b/src/backend/catalog/information_schema.sql
index 78532f52bb63fdd586fe005b1484984dfe629d5f..929535acc5a27175a107df7f1655508589ad1e7c 100644 (file)
--- a/src/backend/catalog/information_schema.sql
+++ b/src/backend/catalog/information_schema.sql
@@ -4,7 +4,7 @@
  *
  * Copyright (c) 2003-2009, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.60 2009/12/07 05:22:21 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.61 2009/12/30 22:48:10 petere Exp $
  */
 
 /*
@@ -1909,7 +1909,12 @@ CREATE VIEW triggers AS
            CAST(n.nspname AS sql_identifier) AS event_object_schema,
            CAST(c.relname AS sql_identifier) AS event_object_table,
            CAST(null AS cardinal_number) AS action_order,
-           CAST(null AS character_data) AS action_condition,
+           -- XXX strange hacks follow
+           CAST(
+             CASE WHEN pg_has_role(c.relowner, 'USAGE')
+               THEN (SELECT m[1] FROM regexp_matches(pg_get_triggerdef(t.oid), E'.{35,} WHEN \\((.+)\\) EXECUTE PROCEDURE') AS rm(m) LIMIT 1)
+               ELSE null END
+             AS character_data) AS action_condition,
            CAST(
              substring(pg_get_triggerdef(t.oid) from
                        position('EXECUTE PROCEDURE' in substring(pg_get_triggerdef(t.oid) from 48)) + 47)