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.

column type references description
rulename name Rule name.
ev_class oid pg_class.oid The table this rule is for.
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 mode the rule fires. Always O, rule fires in origin mode.
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

Parent topic: System Catalogs Definitions

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