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MDEV-16188 Use in-memory PK filters built from range index scans

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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
8d5a11122c.

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.
This commit is contained in:
Igor Babaev
2019-02-03 14:56:12 -08:00
parent 5f46670bd0
commit 658128af43
190 changed files with 5685 additions and 2017 deletions
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16
mysql-test/main/partition_innodb.test
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@ -7,6 +7,13 @@ call mtr.add_suppression("Deadlock found when trying to get lock; try restarting
set global default_storage_engine='innodb';
set session default_storage_engine='innodb';
set @innodb_stats_persistent_save= @@innodb_stats_persistent;
set @innodb_stats_persistent_sample_pages_save=
@@innodb_stats_persistent_sample_pages;
set global innodb_stats_persistent= 1;
set global innodb_stats_persistent_sample_pages=100;
--disable_warnings
drop table if exists t1, t2;
--enable_warnings
@ -38,6 +45,9 @@ INSERT INTO t1 VALUES (0, 'Mod Zero'), (1, 'One'), (2, 'Two'), (3, 'Three'),
(20, '0'), (21, '1'), (22, '2'), (23, '3'),
(4, '4'), (5, '5'), (6, '6'), (7, '7'), (8, '8'), (9, '9');
INSERT INTO t1 SELECT a + 30, b FROM t1 WHERE a >= 0;
INSERT INTO t1 SELECT a + 60, b FROM t1 WHERE a >= 0;
INSERT INTO t1 SELECT a + 120, b FROM t1 WHERE a >= 0;
INSERT INTO t1 SELECT a + 240, b FROM t1 WHERE a >= 0;
ANALYZE TABLE t1;
EXPLAIN SELECT b FROM t1 WHERE b between 'L' and 'N' AND a > -100;
DROP TABLE t1;
@ -772,8 +782,10 @@ insert into t1 select 10+A.a + 10*B.a + 100*C.a + 1000*D.a,
# This should show index_merge, using intersect
--replace_column 9 #
set statement optimizer_switch='rowid_filter=off' for
explain select * from t1 where a=1 and b=2 and pk between 1 and 999999 ;
# 794 rows in output
set statement optimizer_switch='rowid_filter=off' for
create temporary table t3 as
select * from t1 where a=1 and b=2 and pk between 1 and 999 ;
select count(*) from t3;
@ -1015,3 +1027,7 @@ SELECT database_name, table_name FROM mysql.innodb_table_stats WHERE
database_name = 'test_jfg';
DROP DATABASE test_jfg;
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;