pg_rewrite stores rewrite rules for tables and views.
|Row identifier (hidden attribute; must be explicitly selected)|
|The table this rule is for|
| Event type that the rule is for: 1 = |
| Controls in which session_replication_role modes the rule fires. |
|True if the rule is an |
| Expression tree (in the form of a |
| Query tree (in the form of a |
pg_class.relhasrules must be true if a table has any rules in this catalog.