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  1. MariaDB Server
  2. MDEV-29206

DEFAULT NULL for NOT NULL columns is not always detected

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Won't Fix
    • 10.2(EOL), 10.3(EOL), 10.4(EOL), 10.5, 10.6, 10.7(EOL), 10.8(EOL), 10.9(EOL)
    • N/A
    • None

    Description

      Normally DEFAULT NULL is not allowed for NOT NULL columns:

      MariaDB [test]> create table t1 (a int not null default null);
      ERROR 1067 (42000): Invalid default value for 'a'
      MariaDB [test]> create table t1 (a int default null primary key);
      ERROR 1067 (42000): Invalid default value for 'a'
      

      But this error condition is not always detected and sometimes DEFAULT NULL is silently ignored:

      MariaDB [test]> create table t1 (a int default null, primary key (a));
      Query OK, 0 rows affected (0.014 sec)
       
      MariaDB [test]> show create table t1\G
      *************************** 1. row ***************************
             Table: t1
      Create Table: CREATE TABLE `t1` (
        `a` int(11) NOT NULL,
        PRIMARY KEY (`a`)
      ) ENGINE=MyISAM DEFAULT CHARSET=latin1
      1 row in set (0.001 sec)
      

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              serg Sergei Golubchik
              serg Sergei Golubchik
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              Dates

                Created:
                Updated:
                Resolved:

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