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fdc039db29
The parameter innodb_prefix_index_cluster_optimization used to enable an
optimization that was added in cb37c55768
and was disabled by default.
We will unconditionally enable the extension and mark the parameter
as deprecated.
Related to this, the counters
Innodb_secondary_index_triggered_cluster_reads and
Innodb_secondary_index_triggered_cluster_reads_avoided
allowed to determine the usefulness of this optimization.
Now that the configuration parameter is disabled, the counters
do not serve any useful purpose and can be removed.
row_search_with_covering_prefix(): Fix a bug that caused an
incorrect result to be returned.
232 lines
7.8 KiB
Text
232 lines
7.8 KiB
Text
SET @save_innodb_stats_persistent=@@GLOBAL.innodb_stats_persistent;
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SET GLOBAL innodb_stats_persistent = OFF;
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# Create a table with a large varchar field that we index the prefix
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# of and ensure we only trigger cluster lookups when we expect it.
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create table prefixinno (
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id int not null,
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fake_id int not null,
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bigfield varchar(4096),
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primary key(id),
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index bigfield_idx (bigfield(32)),
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index fake_id_bigfield_prefix (fake_id, bigfield(32))
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) engine=innodb;
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insert into prefixinno values (1, 1001, repeat('a', 1)),
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(8, 1008, repeat('b', 8)),
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(24, 1024, repeat('c', 24)),
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(31, 1031, repeat('d', 31)),
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(32, 1032, repeat('x', 32)),
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(33, 1033, repeat('y', 33)),
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(128, 1128, repeat('z', 128));
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select * from prefixinno;
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id fake_id bigfield
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1 1001 a
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8 1008 bbbbbbbb
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24 1024 cccccccccccccccccccccccc
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31 1031 ddddddddddddddddddddddddddddddd
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32 1032 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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33 1033 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
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128 1128 zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
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# Eligible for optimization.
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select id, bigfield from prefixinno where bigfield = repeat('d', 31);
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id bigfield
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31 ddddddddddddddddddddddddddddddd
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# Eligible for optimization, access via fake_id only.
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select id, bigfield from prefixinno where fake_id = 1031;
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id bigfield
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31 ddddddddddddddddddddddddddddddd
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# Not eligible for optimization, access via fake_id of big row.
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select id, bigfield from prefixinno where fake_id = 1033;
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id bigfield
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33 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
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# Not eligible for optimization.
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select id, bigfield from prefixinno where bigfield = repeat('x', 32);
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id bigfield
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32 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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select id, bigfield from prefixinno where bigfield = repeat('y', 33);
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id bigfield
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33 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
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select id, bigfield from prefixinno where bigfield = repeat('b', 8);
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id bigfield
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8 bbbbbbbb
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select id, bigfield from prefixinno where bigfield = repeat('c', 24);
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id bigfield
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24 cccccccccccccccccccccccc
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select id, bigfield from prefixinno where bigfield = repeat('z', 128);
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id bigfield
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128 zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
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select id, bigfield from prefixinno where fake_id = 1033;
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id bigfield
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33 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
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drop table prefixinno;
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# Multi-byte handling case
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SET NAMES utf8mb4;
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CREATE TABLE t1(
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f1 varchar(10) CHARACTER SET UTF8MB4 COLLATE UTF8MB4_BIN,
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INDEX (f1(3)))ENGINE=INNODB;
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INSERT INTO t1 VALUES('a'), ('cccc'), ('až'), ('cčc'), ('ggᵷg'), ('¢¢');
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INSERT INTO t1 VALUES('தமிழ்'), ('🐱🌑'), ('🌒'), ('🌑');
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INSERT INTO t1 VALUES('😊me'), ('eu€'), ('ls¢');
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# Eligible - record length is shorter than prefix
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'a';
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f1
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a
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'c%';
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f1
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cccc
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cčc
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# Eligible - record length shorter than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'až';
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f1
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až
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'தமிழ்';
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f1
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தமிழ்
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'ggᵷ%';
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f1
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ggᵷg
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '😊%';
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f1
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😊me
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'ls¢';
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f1
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ls¢
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# Eligible - record length shorter than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '¢¢%';
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f1
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¢¢
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# Eligible - record length shorter than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🐱🌑%';
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f1
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🐱🌑
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌑%';
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f1
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🌑
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌒%';
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f1
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🌒
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DROP TABLE t1;
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# Multi-byte with minimum character length > 1 bytes
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CREATE TABLE t1(
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f1 varchar(10) CHARACTER SET UTF16 COLLATE UTF16_BIN,
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INDEX (f1(3)))ENGINE=INNODB;
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INSERT INTO t1 VALUES('a'), ('cccc'), ('až'), ('cčc'), ('ggᵷg'), ('¢¢');
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INSERT INTO t1 VALUES('தமிழ்'), ('🐱🌑'), ('🌒'), ('🌑');
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INSERT INTO t1 VALUES('😊me'), ('eu€'), ('ls¢');
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# Eligible - record length is shorter than prefix
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'a';
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f1
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a
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'c%';
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f1
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cccc
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cčc
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# Eligible - record length shorter than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'až';
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f1
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až
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'தமிழ்';
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f1
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தமிழ்
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'ggᵷ%';
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f1
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ggᵷg
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '😊%';
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f1
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😊me
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# Not eligible - record length longer than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'ls¢';
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f1
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ls¢
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# Eligible - record length shorter than prefix length
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SELECT f1 FROM t1 FORCE INDEX(`f1`) WHERE f1 like '¢¢%';
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f1
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¢¢
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# Eligible - record length shorter than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🐱🌑%';
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f1
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🐱🌑
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# Eligible - record length is shorter than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌑%';
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f1
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🌑
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# Eligible - record length is shorter than prefix length
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌒%';
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f1
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🌒
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DROP TABLE t1;
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CREATE TABLE t1(
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col1 INT,
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col2 BLOB DEFAULT NULL,
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INDEX `idx1`(col2(4), col1))ENGINE=INNODB;
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INSERT INTO t1 VALUES (2, 'test'), (3, repeat('test1', 2000));
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INSERT INTO t1(col1) VALUES(1);
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# Eligible - record length is shorter than prefix length
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SELECT col1 FROM t1 FORCE INDEX (`idx1`) WHERE col2 is NULL;
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col1
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1
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# Not eligible - record length longer than prefix index
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SELECT col1 FROM t1 FORCE INDEX (`idx1`) WHERE col2 like 'test1%';
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col1
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3
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DROP TABLE t1;
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#
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# MDEV-20464 Division by 0 in row_search_with_covering_prefix()
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#
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CREATE TABLE t1 (f1 INT, f2 INT AS (f1), f3 INT AS (f1), f4 INT AS (f1),
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KEY (f1,f2,f3)) ENGINE=InnoDB;
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INSERT INTO t1 (f1) VALUES (NULL),(0);
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SELECT f1, MAX(f3), COUNT(f4) FROM t1 GROUP BY f1;
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f1 MAX(f3) COUNT(f4)
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NULL NULL 0
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0 0 1
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DROP TABLE t1;
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#
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# MDEV-23600 Division by 0 in row_search_with_covering_prefix()
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#
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CREATE TABLE t(c POINT UNIQUE) ENGINE=InnoDB;
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INSERT t SET c=POINT(1,1);
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SELECT * FROM t WHERE c > (SELECT MAX(c) FROM t);
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c
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DROP TABLE t;
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#
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# MDEV-12486 Wrong results with innodb_prefix_index_cluster_optimization
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#
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CREATE TABLE wp_blogs (
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blog_id bigint(20) NOT NULL auto_increment,
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site_id bigint(20) NOT NULL default '0',
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domain varchar(200) NOT NULL default '',
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path varchar(100) NOT NULL default '',
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registered datetime NOT NULL default '0000-00-00 00:00:00',
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last_updated datetime NOT NULL default '0000-00-00 00:00:00',
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public tinyint(2) NOT NULL default '1',
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archived tinyint(2) NOT NULL default '0',
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mature tinyint(2) NOT NULL default '0',
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spam tinyint(2) NOT NULL default '0',
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deleted tinyint(2) NOT NULL default '0',
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lang_id int(11) NOT NULL default '0',
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PRIMARY KEY (blog_id),
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KEY domain (domain(50),path(5)),
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KEY lang_id (lang_id)
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) ENGINE=InnoDB DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
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INSERT INTO wp_blogs (domain, path) VALUES
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('domain.no', '/fondsinvesteringer/'), ('domain.no', '/'),
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('foo', 'bar'), ('bar', 'foo'), ('foo', 'foo'), ('bar', 'bar'),
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('foo', 'foobar'), ('bar', 'foobar'), ('foobar', 'foobar');
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SELECT blog_id FROM wp_blogs WHERE domain IN ('domain.no')
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AND path IN ( '/fondsinvesteringer/', '/' );
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blog_id
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2
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1
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DROP TABLE wp_blogs;
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SET GLOBAL innodb_stats_persistent = @save_innodb_stats_persistent;
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