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658128af43
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.
259 lines
7.1 KiB
Text
259 lines
7.1 KiB
Text
set @innodb_stats_persistent_save= @@innodb_stats_persistent;
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set @innodb_stats_persistent_sample_pages_save=
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@@innodb_stats_persistent_sample_pages;
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set global innodb_stats_persistent= 1;
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set global innodb_stats_persistent_sample_pages=100;
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create table t1 (USR_ID integer not null, MAX_REQ integer not null, constraint PK_SEA_USER primary key (USR_ID)) engine=InnoDB;
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insert into t1 values (1, 3);
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select count(*) + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ from t1 group by MAX_REQ;
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count(*) + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ
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1
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select Case When Count(*) < MAX_REQ Then 1 Else 0 End from t1 where t1.USR_ID = 1 group by MAX_REQ;
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Case When Count(*) < MAX_REQ Then 1 Else 0 End
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1
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drop table t1;
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create table t1m (a int) engine=myisam;
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create table t1i (a int) engine=innodb;
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create table t2m (a int) engine=myisam;
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create table t2i (a int) engine=innodb;
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insert into t2m values (5);
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insert into t2i values (5);
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select min(a) from t1m;
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min(a)
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NULL
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select min(7) from t1m;
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min(7)
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NULL
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select min(7) from DUAL;
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min(7)
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7
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explain select min(7) from t2m join t1m;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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select min(7) from t2m join t1m;
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min(7)
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NULL
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select max(a) from t1m;
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max(a)
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NULL
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select max(7) from t1m;
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max(7)
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NULL
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select max(7) from DUAL;
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max(7)
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7
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explain select max(7) from t2m join t1m;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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select max(7) from t2m join t1m;
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max(7)
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NULL
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select 1, min(a) from t1m where a=99;
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1 min(a)
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1 NULL
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select 1, min(a) from t1m where 1=99;
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1 min(a)
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1 NULL
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select 1, min(1) from t1m where a=99;
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1 min(1)
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1 NULL
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select 1, min(1) from t1m where 1=99;
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1 min(1)
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1 NULL
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select 1, max(a) from t1m where a=99;
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1 max(a)
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1 NULL
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select 1, max(a) from t1m where 1=99;
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1 max(a)
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1 NULL
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select 1, max(1) from t1m where a=99;
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1 max(1)
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1 NULL
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select 1, max(1) from t1m where 1=99;
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1 max(1)
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1 NULL
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select min(a) from t1i;
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min(a)
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NULL
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select min(7) from t1i;
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min(7)
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NULL
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select min(7) from DUAL;
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min(7)
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7
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explain select min(7) from t2i join t1i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2i ALL NULL NULL NULL NULL 1
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1 SIMPLE t1i ALL NULL NULL NULL NULL 1 Using join buffer (flat, BNL join)
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select min(7) from t2i join t1i;
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min(7)
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NULL
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select max(a) from t1i;
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max(a)
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NULL
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select max(7) from t1i;
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max(7)
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NULL
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select max(7) from DUAL;
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max(7)
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7
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explain select max(7) from t2i join t1i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2i ALL NULL NULL NULL NULL 1
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1 SIMPLE t1i ALL NULL NULL NULL NULL 1 Using join buffer (flat, BNL join)
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select max(7) from t2i join t1i;
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max(7)
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NULL
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select 1, min(a) from t1i where a=99;
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1 min(a)
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1 NULL
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select 1, min(a) from t1i where 1=99;
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1 min(a)
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1 NULL
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select 1, min(1) from t1i where a=99;
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1 min(1)
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1 NULL
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select 1, min(1) from t1i where 1=99;
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1 min(1)
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1 NULL
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select 1, max(a) from t1i where a=99;
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1 max(a)
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1 NULL
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select 1, max(a) from t1i where 1=99;
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1 max(a)
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1 NULL
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select 1, max(1) from t1i where a=99;
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1 max(1)
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1 NULL
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select 1, max(1) from t1i where 1=99;
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1 max(1)
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1 NULL
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explain select count(*), min(7), max(7) from t1m, t1i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1m system NULL NULL NULL NULL 0 Const row not found
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1 SIMPLE t1i ALL NULL NULL NULL NULL 1
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select count(*), min(7), max(7) from t1m, t1i;
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count(*) min(7) max(7)
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0 NULL NULL
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explain select count(*), min(7), max(7) from t1m, t2i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1m system NULL NULL NULL NULL 0 Const row not found
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1 SIMPLE t2i ALL NULL NULL NULL NULL 1
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select count(*), min(7), max(7) from t1m, t2i;
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count(*) min(7) max(7)
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0 NULL NULL
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explain select count(*), min(7), max(7) from t2m, t1i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2m system NULL NULL NULL NULL 1
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1 SIMPLE t1i ALL NULL NULL NULL NULL 1
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select count(*), min(7), max(7) from t2m, t1i;
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count(*) min(7) max(7)
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0 NULL NULL
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drop table t1m, t1i, t2m, t2i;
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#
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# Bug #57954: BIT_AND function returns incorrect results when
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# semijoin=on
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CREATE TABLE c (
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pk INT,
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col_varchar_key VARCHAR(1),
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PRIMARY KEY (pk),
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KEY col_varchar_key (col_varchar_key)
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) ENGINE=InnoDB;
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INSERT INTO c VALUES (11,NULL);
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INSERT INTO c VALUES (16,'c');
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CREATE TABLE bb (
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pk INT,
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col_varchar_key VARCHAR(1),
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PRIMARY KEY (pk),
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KEY col_varchar_key (col_varchar_key)
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) ENGINE=InnoDB;
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INSERT INTO bb VALUES (10,NULL);
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SELECT straight_join BIT_AND(c.pk)
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FROM
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bb, c
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WHERE c.col_varchar_key='ABC'
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ORDER BY c.pk;
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BIT_AND(c.pk)
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18446744073709551615
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DROP TABLE c,bb;
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#
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# Bug #58050: BIT_OR and BIT_XOR return incorrect results when
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# semijoin=on
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#
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CREATE TABLE t1 (pk INT PRIMARY KEY, b INT, c INT) ENGINE=InnoDB;
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INSERT INTO t1 VALUES(1, 1, 1);
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CREATE TABLE t2 (pk INT PRIMARY KEY, b INT, c INT) ENGINE=InnoDB;
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INSERT INTO t2 VALUES (1, 1, NULL);
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SELECT t1.* FROM t1 JOIN t2 ON t1.c=t2.c WHERE t1.pk=1;
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pk b c
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SELECT BIT_OR(t1.b) FROM t1 JOIN t2 ON t1.c=t2.c WHERE t1.pk=1;
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BIT_OR(t1.b)
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0
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SELECT BIT_AND(t1.b) FROM t1 JOIN t2 ON t1.c=t2.c WHERE t1.pk=1;
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BIT_AND(t1.b)
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18446744073709551615
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SELECT BIT_XOR(t1.b) FROM t1 JOIN t2 ON t1.c=t2.c WHERE t1.pk=1;
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BIT_XOR(t1.b)
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0
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DROP TABLE t1, t2;
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#
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# Bug#12713907: STRANGE OPTIMIZE & WRONG RESULT UNDER ORDER BY
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# COUNT(*) LIMIT.
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#
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CREATE TABLE t1 (
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id BIGINT(20) ,
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member_id_to INT(11) ,
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r_date DATE ,
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PRIMARY KEY (id,r_date),
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KEY r_date_idx (r_date),
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KEY t1_idx01 (member_id_to)
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) ENGINE=InnoDB;
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INSERT INTO t1 VALUES
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(107924526,518491,'2011-05-01'),
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(107924527,518491,'2011-05-01'),
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(107924534,518491,'2011-06-21'),
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(107924535,518491,'2011-06-21'),
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(107924542,1601319,'2011-06-21'),
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(107924543,1601319,'2011-06-21'),
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(107924544,1601319,'2011-06-21'),
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(107924545,1601319,'2011-06-21');
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SELECT member_id_to, COUNT(*) FROM t1 WHERE r_date =
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'2011-06-21' GROUP BY member_id_to ORDER BY 2 LIMIT 1;
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member_id_to COUNT(*)
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518491 2
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DROP TABLE t1;
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#
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# MDEV-4269: crash when grouping by values()
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#
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SELECT @@storage_engine INTO @old_engine;
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set storage_engine=innodb;
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create table y select 1 b;
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select 1 from y group by b;
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1
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1
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select 1 from y group by value(b);
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1
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1
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drop table y;
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SET storage_engine=@old_engine;
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#
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# Bug#13723054 CRASH WITH MIN/MAX AFTER QUICK_GROUP_MIN_MAX_SELECT::NEXT_MIN
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#
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CREATE TABLE t1(a BLOB, b VARCHAR(255) CHARSET LATIN1, c INT,
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KEY(b, c, a(765))) ENGINE=INNODB;
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INSERT INTO t1(a, b, c) VALUES
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('', 'a', 0), ('', 'a', null), ('', 'a', 0), ('', 'a', null), ('', 'a', 0),
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('', 'a', 1), ('', 'a', 1), ('', 'a', 2), ('', 'a', 2), ('', 'a', 3),
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('', 'a', 3), ('', 'a', 4), ('', 'a', 4), ('', 'a', 5), ('', 'a', 5);
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ANALYZE TABLE t1;
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SELECT MIN(c) FROM t1 GROUP BY b;
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MIN(c)
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0
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EXPLAIN SELECT MIN(c) FROM t1 GROUP BY b;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range NULL b 263 NULL 3 Using index for group-by
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DROP TABLE t1;
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End of 5.5 tests
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set global innodb_stats_persistent= @innodb_stats_persistent_save;
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set global innodb_stats_persistent_sample_pages=
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@innodb_stats_persistent_sample_pages_save;
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