pg_rewrite
The pg_rewrite
system catalog table stores rewrite rules for tables and views. pg_class.relhasrules
must be true if a table has any rules in this catalog.
Table 1. pg_catalog.pg_rewrite
column | type | references | description |
---|---|---|---|
rulename |
name | Rule name. | |
ev_class |
oid | pg_class.oid | The table this rule is for. |
ev_attr |
smallint | The column this rule is for (currently, always zero to indicate the whole table). | |
ev_type |
char | Event type that the rule is for:
|
|
is_instead |
boolean | 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. |