Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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10.1.6, 5.5(EOL), 10.0(EOL)
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None
Description
This script:
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a VARCHAR(10) COLLATE latin1_bin);
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INSERT INTO t1 VALUES ('a'),('a ');
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SELECT a, LENGTH(a) FROM t1 WHERE a NOT LIKE 'a ';
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returns one row:
+------+-----------+
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| a | LENGTH(a) |
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+------+-----------+
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| a | 1 |
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+------+-----------+
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Now if I make the condition even stronger:
SELECT a, LENGTH(a) FROM t1 WHERE a NOT LIKE 'a ' AND a='a';
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it erroneously returns 2 rows:
+------+-----------+
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| a | LENGTH(a) |
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+------+-----------+
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| a | 1 |
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| a | 2 |
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+------+-----------+
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The problem happens in equal fields propagation.
WHERE a NOT LIKE 'a ' AND a='a'
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gets rewritten to
WHERE 'a' NOT LIKE 'a ' AND a='a'
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then LIKE gets removed from the condition.
Attachments
Issue Links
- blocks
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- Closed
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