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
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10.1.8-4
Description
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (
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c1 LONGBLOB,
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c2 MEDIUMBLOB,
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c3 BLOB,
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c4 TINYBLOB,
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c5 VARCHAR(64),
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c6 VARCHAR(4000),
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c7 CHAR(64));
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DROP TABLE IF EXISTS t2;
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CREATE TABLE t2 AS SELECT
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MAX(COALESCE(c1)) AS c1,
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MAX(COALESCE(c2)) AS c2,
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MAX(COALESCE(c3)) AS c3,
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MAX(COALESCE(c4)) AS c4,
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MAX(COALESCE(c5)) AS c5,
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MAX(COALESCE(c6)) AS c6,
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MAX(COALESCE(c7)) AS c7 FROM t1;
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SHOW CREATE TABLE 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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`c1` longblob,
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`c2` mediumblob,
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`c3` blob,
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`c4` varbinary(255) DEFAULT NULL,
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`c5` varchar(64) DEFAULT NULL,
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`c6` text,
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`c7` varchar(64) DEFAULT NULL
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
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+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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Now if I run "mysql --column-type-info test" and execute this query:
SELECT
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MAX(COALESCE(c1)) AS c1,
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MAX(COALESCE(c2)) AS c2,
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MAX(COALESCE(c3)) AS c3,
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MAX(COALESCE(c4)) AS c4,
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MAX(COALESCE(c5)) AS c5,
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MAX(COALESCE(c6)) AS c6,
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MAX(COALESCE(c7)) AS c7 FROM t1;
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it returns the following metadata:
Field 1: `c1`
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Type: LONG_BLOB
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Collation: binary (63)
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Length: 4294967295
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Field 2: `c2`
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Type: MEDIUM_BLOB
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Collation: binary (63)
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Length: 16777215
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Field 3: `c3`
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Type: VAR_STRING
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Collation: binary (63)
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Length: 65535
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Field 4: `c4`
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Type: VAR_STRING
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Collation: binary (63)
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Length: 255
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Field 5: `c5`
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Type: VAR_STRING
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Collation: utf8_general_ci (33)
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Length: 192
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Field 6: `c6`
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Type: VAR_STRING
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Collation: utf8_general_ci (33)
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Length: 12000
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Field 7: `c7`
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Type: VAR_STRING
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Collation: utf8_general_ci (33)
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Length: 192
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Notice, for some columns the type of the column created in CREATE TABLE...SELECT does not match the type of the column returned in the metadata for the same SELECT query.