| rulename | name | | Rule name |
| ev_class | oid | pg_class.oid | The table this rule is for |
| ev_attr | int2 | | The column this rule is for (currently, always zero to
indicate the whole table) |
| ev_type | char | | Event type that the rule is for: '1' = SELECT,
'2' = UPDATE, '3' = INSERT, '4' = DELETE |
| is_instead | bool | | True if the rule is an INSTEAD rule |
| ev_qual | text | | Expression tree (in the form of a nodeToString representation)
for the rule's qualifying condition |
| ev_action | text | | Query tree (in the form of a nodeToString representation)
for the rule's action |
