Details
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Bug
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Status: Closed (View Workflow)
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Minor
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Resolution: Fixed
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10.0.10
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None
Description
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);
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--connect (con1,localhost,root,,)
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let $con_id = `SELECT CONNECTION_ID()`;
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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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{
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let $pass = 0;
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}
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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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Attachments
Issue Links
- relates to
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MDEV-165 MWL#182: Explain running statements: finish coding, submit for review
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- Closed
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Activity
Field | Original Value | New Value |
---|---|---|
Link | This issue relates to TODO-142 [ TODO-142 ] |
Status | Open [ 1 ] | In Progress [ 3 ] |
Summary | SHOW EXPLAIN: Plan produced by SHOW EXPLAIN says 'Using where; Using index' while the standard EXPLAIN only says 'Using index' | EXPLAIN+ORDER BY: Different plans produced by SHOW EXPLAIN and EXPLAIN |
Fix Version/s | 10.0.1 [ 11400 ] | |
Fix Version/s | 10.0.0 [ 10000 ] |
Fix Version/s | 10.0.2 [ 11900 ] | |
Fix Version/s | 10.0.1 [ 11400 ] |
Fix Version/s | 10.0.3 [ 12900 ] | |
Fix Version/s | 10.0.2 [ 11900 ] |
Fix Version/s | 10.0.4 [ 13101 ] | |
Fix Version/s | 10.0.3 [ 12900 ] |
Fix Version/s | 10.0.5 [ 13201 ] | |
Fix Version/s | 10.0.4 [ 13101 ] |
Status | In Progress [ 3 ] | Stalled [ 10000 ] |
Fix Version/s | 10.0.6 [ 13202 ] | |
Fix Version/s | 10.0.5 [ 13201 ] |
Fix Version/s | 10.0.7 [ 14100 ] | |
Fix Version/s | 10.0.6 [ 13202 ] |
Fix Version/s | 10.0.8 [ 14200 ] | |
Fix Version/s | 10.0.7 [ 14100 ] |
Fix Version/s | 10.0.9 [ 14400 ] | |
Fix Version/s | 10.0.8 [ 14200 ] |
Fix Version/s | 10.0.10 [ 14500 ] | |
Fix Version/s | 10.0.9 [ 14400 ] |
Fix Version/s | 10.0.11 [ 15200 ] | |
Fix Version/s | 10.0.10 [ 14500 ] |
Affects Version/s | 10.0.10 [ 14500 ] |
Fix Version/s | 10.0.12 [ 15201 ] | |
Fix Version/s | 10.0.11 [ 15200 ] |
Workflow | defaullt [ 12150 ] | MariaDB v2 [ 46608 ] |
Fix Version/s | 10.0.13 [ 16000 ] | |
Fix Version/s | 10.0.12 [ 15201 ] |
Workflow | MariaDB v2 [ 46608 ] | MariaDB v3 [ 67316 ] |
Component/s | Optimizer [ 10200 ] | |
Fix Version/s | 10.2.0 [ 20700 ] | |
Fix Version/s | 10.0 [ 16000 ] | |
Resolution | Fixed [ 1 ] | |
Status | Stalled [ 10000 ] | Closed [ 6 ] |
Workflow | MariaDB v3 [ 67316 ] | MariaDB v4 [ 144833 ] |