Function get_view_query

src/backend/rewrite/rewriteHandler.c:2507–2530

* get_view_query - get the Query from a view's _RETURN rule. * * Caller should have verified that the relation is a view, and therefore * we should find an ON SELECT action. * * Note that the pointer returned is into the relcache and therefore must * be treated as read-only to the caller and not modified or scribbled on. */

 * be treated as read-only to the caller and not modified or scribbled on.
 */
Query *
get_view_query(Relation view)
{
	int			i;

	Assert(view->rd_rel->relkind == RELKIND_VIEW);

	for (i = 0; i < view->rd_rules->numLocks; i++)
	{
		RewriteRule *rule = view->rd_rules->rules[i];

		if (rule->event == CMD_SELECT)
		{
			/* A _RETURN rule should have only one action */
			if (list_length(rule->actions) != 1)
				elog(ERROR, "invalid _RETURN rule action specification");

			return (Query *) linitial(rule->actions);
		}
	}

	elog(ERROR, "failed to find _RETURN rule for view");
	return NULL;				/* keep compiler quiet */
}


/*