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  1. MariaDB Server
  2. MDEV-20292

REPEAT(x,-1) returns a wrong data type

    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 5.5, 10.0, 10.1, 10.2, 10.3, 10.4
    • Fix Version/s: 10.3.18, 10.4.8
    • Component/s: Data types
    • Labels:
      None

      Description

      CREATE OR REPLACE TABLE t1 (i BIGINT);
      INSERT INTO t1 VALUES (42);
      CREATE OR REPLACE TABLE t2 AS SELECT
        REPEAT(i,0) AS c0,
        REPEAT(i,-1) AS c1
      FROM t1;
      SHOW CREATE TABLE t2;
      

      +-------+------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Table | Create Table                                                                                                                                               |
      +-------+------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | t2    | CREATE TABLE `t2` (
        `c0` char(0) CHARACTER SET utf8 DEFAULT NULL,
        `c1` longtext CHARACTER SET utf8 DEFAULT NULL
      ) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
      +-------+------------------------------------------------------------------------------------------------------------------------------------------------------------+
      

      It's expected that c1 also creates a column of the `char(0)` data type.

      This problem causes ColumnStore to crash, see MDEV-20085 for details.

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              • Assignee:
                bar Alexander Barkov
                Reporter:
                bar Alexander Barkov
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                Dates

                • Created:
                  Updated:
                  Resolved: