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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5.5(EOL), 10.0(EOL), 10.1(EOL)
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None
Description
This script:
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a INT ZEROFILL);
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INSERT INTO t1 VALUES (128);
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SELECT * FROM t1 WHERE a=128;
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SELECT * FROM t1 WHERE hex(a)='80';
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correctly returns one row for both SELECT queries.
if I join the two conditions using AND:
SELECT * FROM t1 WHERE a=128 AND hex(a)='80';
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it unexpectedly returns Empty set.
EXPLAIN for the above query tells "Impossible WHERE":
MariaDB [test]> EXPLAIN SELECT * FROM t1 WHERE a=128 AND hex(a)='80';
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+------+-------------+-------+------+---------------+------+---------+------+------+------------------+
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| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
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+------+-------------+-------+------+---------------+------+---------+------+------+------------------+
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| 1 | SIMPLE | NULL | NULL | NULL | NULL | NULL | NULL | NULL | Impossible WHERE |
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+------+-------------+-------+------+---------------+------+---------+------+------+------------------+
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Attachments
Issue Links
- blocks
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- Closed
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