diff options
Diffstat (limited to 'src/backend/optimizer/path/equivclass.c')
| -rw-r--r-- | src/backend/optimizer/path/equivclass.c | 42 |
1 files changed, 0 insertions, 42 deletions
diff --git a/src/backend/optimizer/path/equivclass.c b/src/backend/optimizer/path/equivclass.c index a36d0c9fcf3..d9a65eba35d 100644 --- a/src/backend/optimizer/path/equivclass.c +++ b/src/backend/optimizer/path/equivclass.c @@ -1999,48 +1999,6 @@ add_child_rel_equivalences(PlannerInfo *root, /* - * mutate_eclass_expressions - * Apply an expression tree mutator to all expressions stored in - * equivalence classes (but ignore child exprs unless include_child_exprs). - * - * This is a bit of a hack ... it's currently needed only by planagg.c, - * which needs to do a global search-and-replace of MIN/MAX Aggrefs - * after eclasses are already set up. Without changing the eclasses too, - * subsequent matching of ORDER BY and DISTINCT clauses would fail. - * - * Note that we assume the mutation won't affect relation membership or any - * other properties we keep track of (which is a bit bogus, but by the time - * planagg.c runs, it no longer matters). Also we must be called in the - * main planner memory context. - */ -void -mutate_eclass_expressions(PlannerInfo *root, - Node *(*mutator) (), - void *context, - bool include_child_exprs) -{ - ListCell *lc1; - - foreach(lc1, root->eq_classes) - { - EquivalenceClass *cur_ec = (EquivalenceClass *) lfirst(lc1); - ListCell *lc2; - - foreach(lc2, cur_ec->ec_members) - { - EquivalenceMember *cur_em = (EquivalenceMember *) lfirst(lc2); - - if (cur_em->em_is_child && !include_child_exprs) - continue; /* ignore children unless requested */ - - cur_em->em_expr = (Expr *) - mutator((Node *) cur_em->em_expr, context); - } - } -} - - -/* * generate_implied_equalities_for_column * Create EC-derived joinclauses usable with a specific column. * |