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  1. MariaDB Server
  2. MDEV-14700

ALTER TABLE fails with bogus "BLOB/TEXT column '(null)' can't have a default value"

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    Description

      Support for default values for blobs was added in scope of MDEV-10134. So now this works:

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (i INT);
      		 
      ALTER TABLE t1 ADD COLUMN b1 BLOB NULL;
      		 
      ALTER TABLE t1 ALTER COLUMN b1 SET DEFAULT NULL;


      MariaDB [test]> ALTER TABLE t1 ALTER COLUMN b1 SET DEFAULT NULL;
      		 
      Query OK, 0 rows affected (0.00 sec)
      		 
      Records: 0  Duplicates: 0  Warnings: 0

      But this does not work:

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (i INT);
      		 
      ALTER TABLE t1 ADD COLUMN b2 BLOB NULL, ALTER COLUMN b2 SET DEFAULT NULL;


      MariaDB [test]> ALTER TABLE t1 ADD COLUMN b2 BLOB NULL, ALTER COLUMN b2 SET DEFAULT NULL;
      		 
      ERROR 1101 (42000): BLOB/TEXT column '(null)' can't have a default value

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          Task - A task that needs to be done. MDEV-10134 Add full support for DEFAULT

          • Major - Major loss of function.
          • Closed

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              Unassigned Unassigned
              elenst Elena Stepanova
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                Updated:
                Resolved:

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