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| author | timour@askmonty.org <timour@askmonty.org> | 2013-10-18 11:45:25 +0300 |
|---|---|---|
| committer | timour@askmonty.org <timour@askmonty.org> | 2013-10-18 11:45:25 +0300 |
| commit | afed809297ec43d7825b607b6ebadbabe4f63c2a (patch) | |
| tree | f1d181866a058711fd214f566cc8eb56dc2e2b6f /mysql-test/r/subselect_mat.result | |
| parent | adbb4393586d46257a7d483212748df66261dca8 (diff) | |
| download | mariadb-git-afed809297ec43d7825b607b6ebadbabe4f63c2a.tar.gz | |
MDEV-5123 Remove duplicated conditions pushed both to join_tab->select_cond and join_tab->cache_select->cond for blocked joins.
BNL and BNLH joins pre-filter the records from a joined table via JOIN_TAB::cache_select->cond.
There is no need to re-evaluate the same conditions via JOIN_TAB::select_cond. This patch removes
the duplicated conditions from the top-level conjuncts of each pushed condition.
The added "Using where" in few EXPLAINs is due to taking into account tab->cache_select->cond
in addition to tab->select_cond in JOIN::save_explain_data_intern.
Diffstat (limited to 'mysql-test/r/subselect_mat.result')
| -rw-r--r-- | mysql-test/r/subselect_mat.result | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mysql-test/r/subselect_mat.result b/mysql-test/r/subselect_mat.result index e1c9df3b00b..05635dd0985 100644 --- a/mysql-test/r/subselect_mat.result +++ b/mysql-test/r/subselect_mat.result @@ -1474,7 +1474,7 @@ EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 -2 MATERIALIZED t2 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Rowid-ordered scan +2 MATERIALIZED t2 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Using where; Rowid-ordered scan SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0); pk 2 @@ -2158,7 +2158,7 @@ EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 -2 MATERIALIZED t2 range PRIMARY PRIMARY 4 NULL 2 Using index condition +2 MATERIALIZED t2 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Using where SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0); pk 2 |