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  1. MariaDB Server
  2. MDEV-9745

Crash with CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END

Details

    • 5.5.49

    Description

      This script crashes the server:

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;

      The problem is not repeatable in MySQL-5.7.11.

      It seems it's trying to create a DECIMAL(0,0) column. If I change the script slightly:

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 40 END AS a;
      		 
      SHOW CREATE TABLE t1;

      it does not crash, but the result is incorrect:

      +-------+--------------------------------------------------------------------------------------------+
      		 
      | Table | Create Table                                                                               |
      		 
      +-------+--------------------------------------------------------------------------------------------+
      		 
      | t1    | CREATE TABLE `t1` (
      		 
        `a` decimal(1,0) DEFAULT NULL
      		 
      ) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
      		 
      +-------+--------------------------------------------------------------------------------------------+

      The field data type DECIMAL(1,0) is too small. It should probably be DECIMAL(2,0).

      MySQL-5.7.11 creates a DECIMAL(2,0) column.

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        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-9653 Assertion `length || !scale' failed in uint my_decimal_length_to_precision(uint, uint, bool)

          • Major - Major loss of function.
          • Closed

          Activity

            Ascending order - Click to sort in descending order
            bar Alexander Barkov created issue -
            bar Alexander Barkov made changes -
            Field Original Value New Value
            Labels upstream-not-affected
            bar Alexander Barkov made changes -
            Description This script crashes the server:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
            {code}             		This script crashes the server:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
            {code}

            The problem is not repeatable in MySQL-5.7.11.
            bar Alexander Barkov made changes -
            Description This script crashes the server:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
            {code}

            The problem is not repeatable in MySQL-5.7.11.
            		This script crashes the server:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
            {code}

            The problem is not repeatable in MySQL-5.7.11.

            It seems it's trying to create a DECIMAL(0,0) column. If I change the script slightly:
            {code}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 40 END AS a;
            SHOW CREATE TABLE t1;
            {code}
            bar Alexander Barkov made changes -
            Fix Version/s 5.5 [ 15800 ]
            bar Alexander Barkov made changes -
            Description This script crashes the server:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
            {code}

            The problem is not repeatable in MySQL-5.7.11.

            It seems it's trying to create a DECIMAL(0,0) column. If I change the script slightly:
            {code}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 40 END AS a;
            SHOW CREATE TABLE t1;
            {code}
            		This script crashes the server:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
            {code}

            The problem is not repeatable in MySQL-5.7.11.

            It seems it's trying to create a DECIMAL(0,0) column. If I change the script slightly:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 40 END AS a;
            SHOW CREATE TABLE t1;
            {code}
            it does not crash, but the result is incorrect:
            {noformat}
            +-------+--------------------------------------------------------------------------------------------+
            | Table | Create Table |
            +-------+--------------------------------------------------------------------------------------------+
            | t1 | CREATE TABLE `t1` (
              `a` decimal(1,0) DEFAULT NULL
            ) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
            +-------+--------------------------------------------------------------------------------------------+
            {noformat}
            The field data type DECIMAL(1,0) is too small. It should probably be DECIMAL(2,0).
            bar Alexander Barkov made changes -
            Description This script crashes the server:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
            {code}

            The problem is not repeatable in MySQL-5.7.11.

            It seems it's trying to create a DECIMAL(0,0) column. If I change the script slightly:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 40 END AS a;
            SHOW CREATE TABLE t1;
            {code}
            it does not crash, but the result is incorrect:
            {noformat}
            +-------+--------------------------------------------------------------------------------------------+
            | Table | Create Table |
            +-------+--------------------------------------------------------------------------------------------+
            | t1 | CREATE TABLE `t1` (
              `a` decimal(1,0) DEFAULT NULL
            ) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
            +-------+--------------------------------------------------------------------------------------------+
            {noformat}
            The field data type DECIMAL(1,0) is too small. It should probably be DECIMAL(2,0).
            		This script crashes the server:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
            {code}

            The problem is not repeatable in MySQL-5.7.11.

            It seems it's trying to create a DECIMAL(0,0) column. If I change the script slightly:
            {code:sql}
            DROP TABLE IF EXISTS t1;
            CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 40 END AS a;
            SHOW CREATE TABLE t1;
            {code}
            it does not crash, but the result is incorrect:
            {noformat}
            +-------+--------------------------------------------------------------------------------------------+
            | Table | Create Table |
            +-------+--------------------------------------------------------------------------------------------+
            | t1 | CREATE TABLE `t1` (
              `a` decimal(1,0) DEFAULT NULL
            ) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
            +-------+--------------------------------------------------------------------------------------------+
            {noformat}
            The field data type DECIMAL(1,0) is too small. It should probably be DECIMAL(2,0).

            MySQL-5.7.11 creates a DECIMAL(2,0) column.
            bar Alexander Barkov made changes -
            Status Open [ 1 ] In Progress [ 3 ]
            bar Alexander Barkov made changes -
            Sprint 5.5.49-1 [ 48 ]
            bar Alexander Barkov made changes -
            bar Alexander Barkov made changes -
            Assignee Alexander Barkov [ bar ] Sergei Golubchik [ serg ]
            Status In Progress [ 3 ] In Review [ 10002 ]
            serg Sergei Golubchik made changes -
            Assignee Sergei Golubchik [ serg ] Alexander Barkov [ bar ]
            Status In Review [ 10002 ] Stalled [ 10000 ]
            bar Alexander Barkov made changes -
            Status Stalled [ 10000 ] In Progress [ 3 ]
            bar Alexander Barkov made changes -
            Fix Version/s 5.5.49 [ 21600 ]
            Fix Version/s 5.5 [ 15800 ]
            Resolution Fixed [ 1 ]
            Status In Progress [ 3 ] Closed [ 6 ]
            serg Sergei Golubchik made changes -
            Workflow MariaDB v3 [ 74574 ] MariaDB v4 [ 150234 ]

            People

              bar Alexander Barkov
              bar Alexander Barkov
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              Dates

                Created:
                Updated:
                Resolved:

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