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424a7a2620
The problem was that sometimes InnoDB returned sligtly wrong record count for table, which causes the optimizer to disregard the result from the range optimizer. The end result was that the optimizer choosed a ref access instead of a range access which caused errors in buildbot. Fixed by adding more rows to the table to ensure that table scan is more costly than range scan of the given interval.
95 lines
2.5 KiB
Plaintext
95 lines
2.5 KiB
Plaintext
--source include/have_innodb.inc
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--source include/have_sequence.inc
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--disable_warnings
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drop table if exists t0,t1,t2,t3;
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--enable_warnings
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--echo #
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--echo # MDEV-6402: Optimizer doesn't choose best execution plan when composite key is used
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--echo #
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CREATE TABLE t2 (
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pk1 int(11) NOT NULL,
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pk2 int(11) NOT NULL,
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fd5 bigint(20) DEFAULT NULL,
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filler1 char(200),
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filler2 char(200),
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PRIMARY KEY (pk1,pk2),
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UNIQUE KEY ux_pk1_fd5 (pk1,fd5)
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) ENGINE=InnoDB;
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insert into t2
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select
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round(log(2,seq+1)),
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seq,
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seq,
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REPEAT('filler-data-', 10),
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REPEAT('filler-data-', 10)
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from
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seq_0_to_1999;
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select pk1, count(*) from t2 group by pk1;
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--echo # The following should use range(ux_pk1_fd5), two key parts (key_len=5+8=13)
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EXPLAIN SELECT * FROM t2 USE INDEX(ux_pk1_fd5) WHERE pk1=9 AND fd5 < 500 ORDER BY fd5 DESC LIMIT 10;
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--echo # This also must use range, not ref. key_len must be 13
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EXPLAIN SELECT * FROM t2 WHERE pk1=9 AND fd5 < 500 ORDER BY fd5 DESC LIMIT 10;
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drop table t2;
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--echo #
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--echo # MDEV-6814: Server crashes in calculate_key_len on query with ORDER BY
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--echo #
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CREATE TABLE t1 (f1 INT, f2 INT, f3 INT, KEY(f2),KEY(f2,f1)) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (1,5,0),(2,6,0);
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SELECT * FROM t1 WHERE f1 < 3 AND f2 IS NULL ORDER BY f1;
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DROP TABLE t1;
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--echo #
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--echo # MDEV-6796: Unable to skip filesort when using implicit extended key
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--echo #
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CREATE TABLE t1 (
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pk1 int(11) NOT NULL,
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pk2 varchar(64) NOT NULL,
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col1 varchar(16) DEFAULT NULL,
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PRIMARY KEY (pk1,pk2),
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KEY key1 (pk1,col1)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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CREATE TABLE t2 (
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pk1 int(11) NOT NULL,
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pk2 varchar(64) NOT NULL,
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col1 varchar(16) DEFAULT NULL,
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PRIMARY KEY (pk1,pk2),
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KEY key1 (pk1,col1,pk2)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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INSERT INTO `t1` VALUES
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(12321321,'a8f5f167f44f4964e6c998dee827110c','video'),
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(12321321,'d77a17a3659ffa60c54e0ea17b6c6d16','video'),
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(12321321,'wwafdsafdsafads','video'),
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(12321321,'696aa249f0738e8181957dd57c2d7d0b','video-2014-09-23'),
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(12321321,'802f9f29584b486f356693e3aa4ef0af','video=sdsd'),
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(12321321,'2f94543ff74aab82e9a058b4e8316d75','video=sdsdsds'),
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(12321321,'c1316b9df0d203fd1b9035308de52a0a','video=sdsdsdsdsd');
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insert into t2 select * from t1;
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--echo # this must not use filesort:
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explain SELECT pk2
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FROM t1 USE INDEX(key1)
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WHERE pk1 = 123
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AND col1 = 'video'
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ORDER BY pk2 DESC LIMIT 21;
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--echo # this must not use filesort, either:
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explain SELECT pk2
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FROM t2 USE INDEX(key1)
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WHERE pk1 = 123 AND col1 = 'video'
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ORDER BY pk2 DESC LIMIT 21;
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drop table t1, t2;
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