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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10.0, 10.1, 10.2
Description
CREATE OR REPLACE TABLE t1 (a INT, b INT UNSIGNED);
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INSERT INTO t1 VALUES (0x7FFFFFFF,0xFFFFFFFF);
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CREATE OR REPLACE TABLE t2 AS SELECT a FROM t1 UNION SELECT b FROM t1;
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SHOW CREATE TABLE t2;
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SELECT * FROM t2;
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returns
+-------+---------------------------------------------------------------------------------------+
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| Table | Create Table |
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+-------+---------------------------------------------------------------------------------------+
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| t2 | CREATE TABLE `t2` (
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`a` int(11) DEFAULT NULL
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
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+-------+---------------------------------------------------------------------------------------+
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This is wrong, as huge positive unsigned values are converted to negative values:
+------------+
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| a |
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+------------+
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| 2147483647 |
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| -1 |
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+------------+
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Note, unlike UNION, hybrid functions aggregate data types correctly:
CREATE OR REPLACE TABLE t1 (a INT, b INT UNSIGNED);
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INSERT INTO t1 VALUES (0x7FFFFFFF,0xFFFFFFFF);
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CREATE OR REPLACE TABLE t2 AS SELECT COALESCE(a,b), COALESCE(b,a) FROM t1;
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SHOW CREATE TABLE t2;
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SELECT * FROM t2;
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returns
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Table | Create Table |
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+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------+
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| t2 | CREATE TABLE `t2` (
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`COALESCE(a,b)` decimal(10,0) DEFAULT NULL,
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`COALESCE(b,a)` decimal(10,0) DEFAULT NULL
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
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+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------+
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and the values are preserved:
+---------------+---------------+
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| COALESCE(a,b) | COALESCE(b,a) |
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+---------------+---------------+
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| 2147483647 | 4294967295 |
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+---------------+---------------+
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Attachments
Issue Links
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MDEV-4912 Data type plugin API version 1
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- Closed
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- is duplicated by
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- Closed
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- relates to
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MDEV-12775 Reuse data type aggregation code for hybrid functions and UNION
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- Closed
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