Changeset: ce4deec37a48 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=ce4deec37a48
Modified Files:
sql/server/rel_rewriter.c
Branch: default
Log Message:
Replace inner relation only if value based optimization is allowed
diffs (12 lines):
diff --git a/sql/server/rel_rewriter.c b/sql/server/rel_rewriter.c
--- a/sql/server/rel_rewriter.c
+++ b/sql/server/rel_rewriter.c
@@ -179,7 +179,7 @@ rewrite_simplify(visitor *v, sql_rel *re
if ((is_select(rel->op) || is_join(rel->op) || is_semi(rel->op)) &&
!list_empty(rel->exps)) {
rel->exps = exps_simplify_exp(v, rel->exps);
/* At a select or inner join relation if the single expression
is false, eliminate the inner relations with a dummy projection */
- if (list_length(rel->exps) == 1 &&
exp_is_false(rel->exps->h->data)) {
+ if (v->value_based_opt && list_length(rel->exps) == 1 &&
exp_is_false(rel->exps->h->data)) {
if ((is_select(rel->op) || (is_innerjoin(rel->op) &&
!rel_is_ref(rel->r))) && rel->card > CARD_ATOM && !rel_is_ref(rel->l)) {
list *nexps = sa_list(v->sql->sa), *toconvert =
rel_projections(v->sql, rel->l, NULL, 1, 1);
if (is_innerjoin(rel->op))
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