For the following query
SELECT al1.a FROM t1 AS al1, t1 AS al2
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WHERE al1.a = al2.a HAVING al1.a != 3 ORDER BY al1.a;
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the plan produced by SHOW EXPLAIN contains 'Using where; Using index' in the Extra field, while normal EXPLAIN only says 'Using index'.
bzr version-info
revision-id: psergey@askmonty.org-20120607171922-w5d79pe7733jrh2r
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date: 2012-06-07 21:19:22 +0400
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revno: 3412
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Reproducible with Aria and InnoDB, with the default optimizer_switch.
SHOW EXPLAIN:
id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE al1 index a a 4 NULL 98 Using where; Using index
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1 SIMPLE al2 ref a a 4 test.al1.a 11 Using index
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EXPLAIN:
id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE al1 index a a 4 NULL 8 Using index
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1 SIMPLE al2 ref a a 4 test.al1.a 11 Using index
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Test case:
CREATE TABLE t1 (a INT NOT NULL, KEY(a)) ENGINE=Aria;
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INSERT INTO t1 VALUES (4),(8),(0),(0),(0),(7),(7),(5),
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(3),(188),(4),(9),(6),(1),(5),(6),(2),(4),(231),(4),
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(3),(3),(7),(6),(7),(9),(4),(4),(2),(1),(2),(194),(2),
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(3),(8),(4),(9),(4),(5),(5),(9),(3),(8),(0),(98),(3),
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(1),(0),(189),(8),(3),(3),(9),(6),(8),(3),(9),(5),(9),
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(2),(2),(5),(8),(6),(9),(0),(3),(6),(5),(8),(2),(120),
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(25),(1),(3),(1),(3),(153),(5),(9),(1),(8),(7),(6),(2),
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(4),(7),(3),(8),(4),(6),(1),(7),(1),(7),(2),(1),(5);
|
|
--connect (con1,localhost,root,,)
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let $con_id = `SELECT CONNECTION_ID()`;
|
|
EXPLAIN
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SELECT al1.a FROM t1 AS al1, t1 AS al2
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WHERE al1.a = al2.a HAVING al1.a != 3 ORDER BY al1.a;
|
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--send
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SELECT al1.a FROM t1 AS al1, t1 AS al2
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WHERE al1.a = al2.a HAVING al1.a != 3 ORDER BY al1.a;
|
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--connection default
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let $fail = 100;
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while ($fail)
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{
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--error 0,ER_ERROR_WHEN_EXECUTING_COMMAND
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--eval SHOW EXPLAIN FOR $con_id
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--dec $fail
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if (!$mysql_errno)
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{
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let $fail = 0;
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}
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}
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let $pass = 5;
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while ($pass)
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{
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--error 0,ER_ERROR_WHEN_EXECUTING_COMMAND
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--eval SHOW EXPLAIN FOR $con_id
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--dec $pass
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if ($mysql_errno)
|
{
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let $pass = 0;
|
}
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}
|
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--connection con1
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--disable_result_log
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--reap
|
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- relates to
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MDEV-165
MWL#182: Explain running statements: finish coding, submit for review
-
-
Closed
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