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  1. MariaDB Server
  2. MDEV-20332

Wrong UNSIGNED metadata flag returned for COALESCE(unsigned_field,timestamp_field)

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 10.5, 5.5(EOL), 10.0(EOL), 10.1(EOL), 10.2(EOL), 10.3(EOL), 10.4(EOL)
    • 10.5.0
    • Data types
    • None

    Description

      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.

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              bar Alexander Barkov
              bar Alexander Barkov
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                Created:
                Updated:
                Resolved:

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