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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/include/explain_non_select.inc | |
| 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/include/explain_non_select.inc')
| -rw-r--r-- | mysql-test/include/explain_non_select.inc | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mysql-test/include/explain_non_select.inc b/mysql-test/include/explain_non_select.inc index 57b96994d20..d22310c9813 100644 --- a/mysql-test/include/explain_non_select.inc +++ b/mysql-test/include/explain_non_select.inc @@ -158,7 +158,7 @@ CREATE TABLE t1 ( a int PRIMARY KEY ); --let $query = DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a --let $select = SELECT * FROM t1 WHERE t1.a > 0 ORDER BY t1.a --source include/explain_utils.inc -INSERT INTO t1 VALUES (1), (2), (3); +INSERT INTO t1 VALUES (1), (2), (3), (-1), (-2), (-3); --let $query = DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a --let $select = SELECT * FROM t1 WHERE t1.a > 0 ORDER BY t1.a --source include/explain_utils.inc @@ -640,7 +640,7 @@ DROP VIEW v1; --echo #63 CREATE TABLE t1 (a INT, PRIMARY KEY(a)); -INSERT INTO t1 VALUES (1), (2), (3), (4), (5); +INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9); CREATE VIEW v1 (a) AS SELECT a FROM t1; --let $query = DELETE FROM v1 WHERE a < 4 --let $select = SELECT * FROM v1 WHERE a < 4 |