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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.
341 lines
9.2 KiB
Text
341 lines
9.2 KiB
Text
#
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# Test of different EXPLAINs
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--disable_warnings
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drop table if exists t1;
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--enable_warnings
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create table t1 (id int not null, str char(10), unique(str));
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explain select * from t1;
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insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
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select * from t1 where str is null;
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select * from t1 where str="foo";
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explain select * from t1 where str is null;
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explain select * from t1 where str="foo";
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explain select * from t1 ignore key (str) where str="foo";
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explain select * from t1 use key (str,str) where str="foo";
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#The following should give errors
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--error 1176
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explain select * from t1 use key (str,str,foo) where str="foo";
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--error 1176
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explain select * from t1 ignore key (str,str,foo) where str="foo";
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drop table t1;
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explain select 1;
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create table t1 (a int not null);
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explain select count(*) from t1;
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insert into t1 values(1);
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explain select count(*) from t1;
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insert into t1 values(1);
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explain select count(*) from t1;
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drop table t1;
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#
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# Bug #3403 Wrong encoding in EXPLAIN SELECT output
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#
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set names koi8r;
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create table ÔÁÂ (ËÏÌ0 int, ËÏÌ1 int, key ÉÎÄ0 (ËÏÌ0), key ÉÎÄ01 (ËÏÌ0,ËÏÌ1));
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insert into ÔÁÂ (ËÏÌ0) values (1);
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insert into ÔÁÂ (ËÏÌ0) values (2);
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explain select ËÏÌ0 from ÔÁÂ where ËÏÌ0=1;
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drop table ÔÁÂ;
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set names latin1;
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# End of 4.1 tests
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#
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# Bug#15463: EXPLAIN SELECT..INTO hangs the client (QB, command line)
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#
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select 3 into @v1;
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explain select 3 into @v1;
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#
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# Bug#22331: Wrong WHERE in EXPLAIN EXTENDED when all expressions were
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# optimized away.
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#
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create table t1(f1 int, f2 int);
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insert into t1 values (1,1);
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create view v1 as select * from t1 where f1=1;
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explain extended select * from v1 where f2=1;
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explain extended select * from t1 where 0;
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explain extended select * from t1 where 1;
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explain extended select * from t1 having 0;
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explain extended select * from t1 having 1;
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drop view v1;
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drop table t1;
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#
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# Bug #32241: memory corruption due to large index map in 'Range checked for
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# each record'
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#
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CREATE TABLE t1(c INT);
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INSERT INTO t1 VALUES (),();
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CREATE TABLE t2 (b INT,
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
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KEY(b),KEY(b),KEY(b),KEY(b),KEY(b));
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INSERT INTO t2 VALUES (),(),();
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# We only need to make sure that there is no buffer overrun and the index map
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# is displayed correctly
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--replace_column 1 X 2 X 3 X 4 X 5 X 6 X 7 X 8 X 9 X
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EXPLAIN SELECT 1 FROM
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(SELECT 1 FROM t2,t1 WHERE b < c GROUP BY 1 LIMIT 1) AS d2;
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DROP TABLE t2;
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DROP TABLE t1;
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#
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# Bug #34773: query with explain extended and derived table / other table
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# crashes server
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#
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CREATE TABLE t1(a INT);
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CREATE TABLE t2(a INT);
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INSERT INTO t1 VALUES (1),(2);
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INSERT INTO t2 VALUES (1),(2);
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EXPLAIN EXTENDED SELECT 1
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FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
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EXPLAIN EXTENDED SELECT 1
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FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
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prepare s1 from
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'EXPLAIN EXTENDED SELECT 1
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FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
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execute s1;
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prepare s1 from
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'EXPLAIN EXTENDED SELECT 1
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FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
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execute s1;
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execute s1;
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DROP TABLE t1,t2;
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#
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# Bug #43354: Use key hint can crash server in explain extended query
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#
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CREATE TABLE t1 (a INT PRIMARY KEY);
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--error ER_KEY_DOES_NOT_EXITS
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EXPLAIN EXTENDED SELECT COUNT(a) FROM t1 USE KEY(a);
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DROP TABLE t1;
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#
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# Bug#45989 memory leak after explain encounters an error in the query
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#
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CREATE TABLE t1(a LONGTEXT);
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INSERT INTO t1 VALUES (repeat('a',@@global.max_allowed_packet));
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INSERT INTO t1 VALUES (repeat('b',@@global.max_allowed_packet));
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--error ER_BAD_FIELD_ERROR
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EXPLAIN SELECT DISTINCT 1 FROM t1,
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(SELECT DISTINCTROW a AS away FROM t1 GROUP BY a WITH ROLLUP) as d1
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WHERE t1.a = d1.a;
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DROP TABLE t1;
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--echo #
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--echo # Bug#48295:
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--echo # explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode
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--echo #
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CREATE TABLE t1 (f1 INT not null);
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SELECT @@session.sql_mode INTO @old_sql_mode;
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SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
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# EXPLAIN EXTENDED (with subselect). used to crash. should give NOTICE.
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# Before moving max/min optimization to optimize phase this statement
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# generated error, but as far as original query do not contain aggregate
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# function user should not see error
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# --error ER_MIX_OF_GROUP_FUNC_AND_FIELDS
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EXPLAIN EXTENDED SELECT 1 FROM t1
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WHERE f1 > ALL( SELECT t.f1 FROM t1,t1 AS t );
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SET SESSION sql_mode=@old_sql_mode;
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DROP TABLE t1;
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--echo End of 5.0 tests.
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--echo #
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--echo # Bug#37870: Usage of uninitialized value caused failed assertion.
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--echo #
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create table t1 (dt datetime not null, t time not null);
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create table t2 (dt datetime not null);
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insert into t1 values ('2001-01-01 1:1:1', '1:1:1'),
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('2001-01-01 1:1:1', '1:1:1');
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insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1');
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SET @save_join_cache_level=@@join_cache_level;
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SET join_cache_level=0;
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flush tables;
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EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
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flush tables;
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SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
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flush tables;
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EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
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flush tables;
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SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
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SET join_cache_level=@save_join_cache_level;
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drop tables t1, t2;
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--echo #
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--echo # Bug#47669: Query showed by EXPLAIN EXTENDED gives different result from original query
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--echo #
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CREATE TABLE t1 (c int);
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INSERT INTO t1 VALUES (NULL);
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CREATE TABLE t2 (d int);
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INSERT INTO t2 VALUES (NULL), (0);
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EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) FROM t1;
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DROP TABLE t1, t2;
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--echo #
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--echo # Bug#30302: Tables that were optimized away are printed in the
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--echo # EXPLAIN EXTENDED warning.
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--echo #
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create table t1(f1 int);
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create table t2(f2 int);
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insert into t1 values(1);
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insert into t2 values(1),(2);
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explain extended select * from t1 where f1=1;
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explain extended select * from t1 join t2 on f1=f2 where f1=1;
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drop table t1,t2;
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--echo #
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--echo # Bug #48419: another explain crash..
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--echo #
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CREATE TABLE t1 (a INT);
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CREATE TABLE t2 (b BLOB, KEY b(b(100)));
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INSERT INTO t2 VALUES ('1'), ('2'), ('3');
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FLUSH TABLES;
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EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT 1 FROM t1 t JOIN t2 WHERE b <= 1 AND t.a);
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DROP TABLE t1, t2;
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--echo #
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--echo # Bug #48573: difference of index selection between rpm binary and
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--echo # .tar.gz, windows vs linux..
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--echo #
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CREATE TABLE t1(c1 INT, c2 INT, c4 INT, c5 INT, KEY(c2, c5), KEY(c2, c4, c5));
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INSERT INTO t1 VALUES(4, 1, 1, 1);
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INSERT INTO t1 VALUES(3, 1, 1, 1);
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INSERT INTO t1 VALUES(2, 1, 1, 1);
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INSERT INTO t1 VALUES(1, 1, 1, 1);
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INSERT INTO t1 VALUES(5, 2, 1, 1);
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INSERT INTO t1 VALUES(6, 2, 1, 1);
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INSERT INTO t1 VALUES(7, 3, 1, 1);
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INSERT INTO t1 VALUES(9, 3, 1, 1);
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INSERT INTO t1 VALUES(10, 4, 1, 1);
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INSERT INTO t1 VALUES(11, 4, 1, 1);
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EXPLAIN SELECT c1 FROM t1 WHERE c2 = 1 AND c4 = 1 AND c5 = 1;
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DROP TABLE t1;
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--echo #
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--echo # Bug#56814 Explain + subselect + fulltext crashes server
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--echo #
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CREATE TABLE t1(f1 VARCHAR(6) NOT NULL,
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FULLTEXT KEY(f1),UNIQUE(f1));
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INSERT INTO t1 VALUES ('test');
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EXPLAIN SELECT 1 FROM t1
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WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a ON (MATCH(t1.f1) AGAINST (""))
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WHERE t1.f1 GROUP BY t1.f1));
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PREPARE stmt FROM
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'EXPLAIN SELECT 1 FROM t1
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WHERE 1 > ALL((SELECT t1.f1 FROM t1 RIGHT OUTER JOIN t1 a
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ON (MATCH(t1.f1) AGAINST (""))
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WHERE t1.f1 GROUP BY t1.f1))';
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EXECUTE stmt;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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PREPARE stmt FROM
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'EXPLAIN SELECT 1 FROM t1
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WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a
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ON (MATCH(t1.f1) AGAINST (""))
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WHERE t1.f1 GROUP BY t1.f1))';
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EXECUTE stmt;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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DROP TABLE t1;
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--echo End of 5.1 tests.
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--echo #
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--echo # Bug#11829785 EXPLAIN EXTENDED CRASH WITH RIGHT OUTER JOIN, SUBQUERIES
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--echo #
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CREATE TABLE t1(a INT);
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INSERT INTO t1 VALUES (0), (0);
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PREPARE s FROM
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'EXPLAIN EXTENDED
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SELECT SUBSTRING(1, (SELECT 1 FROM t1 a1 RIGHT OUTER JOIN t1 ON 0)) AS d
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FROM t1 WHERE 0 > ANY (SELECT @a FROM t1)';
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--error ER_SUBQUERY_NO_1_ROW
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EXECUTE s;
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DEALLOCATE PREPARE s;
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DROP TABLE t1;
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--echo #
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--echo # Bug#776295: EXPLAIN EXTENDED with always false multiple equality
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--echo # in the WHERE condition of a derived table
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--echo #
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CREATE TABLE t1 (a int) ;
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CREATE TABLE t2 (a int) ;
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INSERT INTO t2 VALUES (8);
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set @tmp_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='derived_merge=off,derived_with_keys=off';
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EXPLAIN EXTENDED
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SELECT * FROM ( SELECT t1.a FROM t1,t2 WHERE t2.a = t1.a ) AS t;
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set optimizer_switch=@tmp_optimizer_switch;
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DROP TABLE t1,t2;
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--echo #
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--echo # MDEV-7215: EXPLAIN REPLACE produces an error:
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--echo # Column count doesn't match value count
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--echo #
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create table t1 (a int);
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insert into t1 values (1);
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create table t2 (b int, c int);
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replace into t2 select 100, (select a from t1);
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explain replace into t2 select 100, (select a from t1);
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#analyze replace into t2 select 100, (select a from t1);
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drop table t1, t2;
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--echo # End of 10.1 tests
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