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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.
|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|