* make_rels_by_clauseless_joins()
* join_is_legal()
* has_join_restriction()
- * is_dummy_rel()
* restriction_is_constant_false()
* update_child_rel_info()
* build_child_join_sjinfo()
/*
- * is_dummy_rel --- has relation been proven empty?
- */
-static bool
-is_dummy_rel(RelOptInfo *rel)
-{
- return IS_DUMMY_REL(rel);
-}
-
-/*
* Mark a relation as proven empty.
*
* During GEQO planning, this can get invoked more than once on the same