Changeset: 33032ce1a860 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=33032ce1a860
Modified Files:
sql/backends/monet5/rel_bin.c
Branch: Jun2020
Log Message:
if no-mitosis is set, and we have a simple semijoin case (don't use the more
general join/semijoin route)
diffs (59 lines):
diff --git a/sql/backends/monet5/rel_bin.c b/sql/backends/monet5/rel_bin.c
--- a/sql/backends/monet5/rel_bin.c
+++ b/sql/backends/monet5/rel_bin.c
@@ -2230,6 +2230,7 @@ split_join_exps(sql_rel *rel, list *join
}
#define is_equi_exp(e) ((e)->flag == cmp_equal || (e)->flag == mark_in ||
(e)->flag == mark_notin)
+#define is_equi_exp_(e) ((e)->flag == cmp_equal || (e)->flag == mark_in)
static list *
get_equi_joins_first(mvc *sql, list *exps, int *equality_only)
@@ -2554,6 +2555,7 @@ rel2bin_semijoin(backend *be, sql_rel *r
list *l, *sexps = NULL;
node *en = NULL, *n;
stmt *left = NULL, *right = NULL, *join = NULL, *jl, *jr, *c, *lcand =
NULL;
+ int semijoin_only = 0;
if (rel->op == op_anti && !list_empty(rel->exps) &&
list_length(rel->exps) == 1 && ((sql_exp*)rel->exps->h->data)->flag ==
mark_notin)
return rel2bin_antijoin(be, rel, refs);
@@ -2634,7 +2636,13 @@ rel2bin_semijoin(backend *be, sql_rel *r
if (!l || !r)
return NULL;
- s = stmt_join_cand(be, column(be, l),
column(be, r), left->cand, NULL/*right->cand*/, e->anti, (comp_type) e->flag,
0, is_semantics(e), false);
+ if (sql->no_mitosis &&
list_length(jexps) == 1 && list_empty(sexps) && rel->op == op_semi && !e->anti
&& is_equi_exp_(e)) {
+ join = stmt_semijoin(be,
column(be, l), column(be, r), left->cand, NULL/*right->cand*/, is_semantics(e),
false);
+ semijoin_only = 1;
+ en = NULL;
+ break;
+ } else
+ s = stmt_join_cand(be,
column(be, l), column(be, r), left->cand, NULL/*right->cand*/, e->anti,
(comp_type) e->flag, 0, is_semantics(e), false);
lcand = left->cand;
} else {
s = exp_bin(be, e, left, right, NULL,
NULL, NULL, NULL, NULL, 0, 1);
@@ -2741,14 +2749,16 @@ rel2bin_semijoin(backend *be, sql_rel *r
/* We did a full join, thats too much.
Reduce this using difference and intersect */
- c = stmt_mirror(be, left->op4.lval->h->data);
- if (rel->op == op_anti) {
- join = stmt_tdiff(be, c, jl, lcand);
- } else {
- if (lcand)
- join = stmt_semijoin(be, c, jl, lcand,
NULL/*right->cand*/, 0, false);
- else
- join = stmt_tinter(be, c, jl, false);
+ if (!semijoin_only) {
+ c = stmt_mirror(be, left->op4.lval->h->data);
+ if (rel->op == op_anti) {
+ join = stmt_tdiff(be, c, jl, lcand);
+ } else {
+ if (lcand)
+ join = stmt_semijoin(be, c, jl, lcand,
NULL/*right->cand*/, 0, false);
+ else
+ join = stmt_tinter(be, c, jl, false);
+ }
}
/* project all the left columns */
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