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| author | Igor Babaev <igor@askmonty.org> | 2019-02-03 14:56:12 -0800 |
|---|---|---|
| committer | Igor Babaev <igor@askmonty.org> | 2019-02-03 14:56:12 -0800 |
| commit | 658128af43b4d7c6db445164f8ed25ed4d1e3109 (patch) | |
| tree | 7a71580cca55759b8bb2730e117436478948d77f /mysql-test/main/type_bit.result | |
| parent | 5f46670bd09babbee75a24ac82eb4ade0706da66 (diff) | |
| download | mariadb-git-658128af43b4d7c6db445164f8ed25ed4d1e3109.tar.gz | |
MDEV-16188 Use in-memory PK filters built from range index scans
This patch contains a full implementation of the optimization
that allows to use in-memory rowid / primary filters built for range
conditions over indexes. In many cases usage of such filters reduce
the number of disk seeks spent for fetching table rows.
In this implementation the choice of what possible filter to be applied
(if any) is made purely on cost-based considerations.
This implementation re-achitectured the partial implementation of
the feature pushed by Galina Shalygina in the commit
8d5a11122c32f4d9eb87536886c6e893377bdd07.
Besides this patch contains a better implementation of the generic
handler function handler::multi_range_read_info_const() that
takes into account gaps between ranges when calculating the cost of
range index scans. It also contains some corrections of the
implementation of the handler function records_in_range() for MyISAM.
This patch supports the feature for InnoDB and MyISAM.
Diffstat (limited to 'mysql-test/main/type_bit.result')
| -rw-r--r-- | mysql-test/main/type_bit.result | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/mysql-test/main/type_bit.result b/mysql-test/main/type_bit.result index 12fe302a5be..42b31be72d2 100644 --- a/mysql-test/main/type_bit.result +++ b/mysql-test/main/type_bit.result @@ -256,7 +256,7 @@ a+0 b+0 127 403 explain select a+0, b+0 from t1 where a > 40 and a < 70 order by 2; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 range a a 2 NULL 8 Using where; Using index; Using filesort +1 SIMPLE t1 range a a 2 NULL 9 Using where; Using index; Using filesort select a+0, b+0 from t1 where a > 40 and a < 70 order by 2; a+0 b+0 57 135 @@ -677,9 +677,12 @@ DROP TABLE t2; CREATE TABLE t1(a BIT(13), KEY(a)); INSERT IGNORE INTO t1(a) VALUES (65535),(65525),(65535),(65535),(65535),(65535),(65535),(65535),(65535),(65535); +ANALYZE TABLE t1; +Table Op Msg_type Msg_text +test.t1 analyze status OK EXPLAIN SELECT 1 FROM t1 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 range NULL a 3 NULL 6 Using index for group-by +1 SIMPLE t1 range NULL a 3 NULL 2 Using index for group-by SELECT 1 FROM t1 GROUP BY a; 1 1 @@ -762,7 +765,7 @@ CREATE TABLE t1 (a BIT(7), b BIT(9), KEY(a, b)); INSERT INTO t1 VALUES(0, 0), (5, 3), (5, 6), (6, 4), (7, 0); EXPLAIN SELECT a+0, b+0 FROM t1 WHERE a > 4 and b < 7 ORDER BY 2; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 range a a 2 NULL 4 Using where; Using index; Using filesort +1 SIMPLE t1 index a a 5 NULL 5 Using where; Using index; Using filesort DROP TABLE t1; End of 5.0 tests create table t1(a bit(7)); |