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Note: The following description applies both to Postgres-XC and PostgreSQL if not described explicitly.
The catalog pg_rewrite stores rewrite rules for tables and views.
Table 45-36. pg_rewrite Columns
| Name | Type | References | Description |
|---|---|---|---|
| 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 | |
| ev_enabled | char | Controls in which session_replication_role modes the rule fires. O = rule fires in "origin" and "local" modes, D = rule is disabled, R = rule fires in "replica" mode, A = rule fires always. | |
| is_instead | bool | True if the rule is an INSTEAD rule | |
| ev_qual | pg_node_tree | Expression tree (in the form of a
nodeToString() representation) for the
rule's qualifying condition
| |
| ev_action | pg_node_tree | Query tree (in the form of a
nodeToString() representation) for the
rule's action
|
Note: pg_class.relhasrules must be true if a table has any rules in this catalog.