[MDEV-20332] Wrong UNSIGNED metadata flag returned for COALESCE(unsigned_field,timestamp_field) - Jira

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I run this command

mysql --column-type-info test

and execute the following script:

CREATE OR REPLACE TABLE t1 (a INT UNSIGNED, b TIMESTAMP);

SELECT COALESCE(a,b) FROM t1;

Field   1:  `COALESCE(a,b)`

Catalog:    `def`

Database:   ``

Table:      ``

Org_table:  ``

Type:       VAR_STRING

Collation:  utf8_general_ci (33)

Length:     57

Max_length: 0

Decimals:   39

Flags:      UNSIGNED

Note, in prints the UNSIGNED flag, although this flag is not applicable to VAR_STRING.

Note, this script correctly creates a column of the VARCHAR data type without any UNSIGNED flags:

CREATE OR REPLACE TABLE t1 (a INT UNSIGNED, b TIMESTAMP);

CREATE OR REPLACE TABLE t2 AS SELECT COALESCE(a,b) AS c FROM t1;

SHOW CREATE TABLE t2;

+-------+--------------------------------------------------------------------------------------------------------------+

| Table | Create Table                                                                                                 |

+-------+--------------------------------------------------------------------------------------------------------------+

| t2    | CREATE TABLE `t2` (

  `c` varchar(19) CHARACTER SET utf8 DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

+-------+--------------------------------------------------------------------------------------------------------------+

Result field metadata should be fixed to match the column type created in CREATE..SELECT.

blocks

MDEV-4912 Data type plugin API version 1

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