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  1. MariaDB Server
  2. MDEV-8504

mariadb makes non explicit rounding for DECIMAL type dynamic columns

Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Not a Bug
    • 10.0.20
    • N/A
    • Dynamic Columns
    • None
    • Linux

    Description

      SET @aaa = COLUMN_CREATE('sum', 18802.5);
      		 
      SELECT COLUMN_GET(@aaa, 'sum' AS DECIMAL);
      		 

      COLUMN_GET(@aaa, 'sum' as decimal)  
      ------------------------------------
      		 
      18803

      Expected see here 18802.5 because i not pointed here any restrictions for DECIMAL type

      So why by default DECIMAL works as INT? I think this is not expected and not correct.

      Attachments

        Activity

          serg Sergei Golubchik added a comment -

          It is documented: https://mariadb.com/kb/en/mariadb/decimal/

          DECIMAL[(M[,D])] [UNSIGNED] [ZEROFILL]

          …If D is omitted, the default is 0. If M is omitted, the default is 10.

          Compare with:

          MariaDB [test]> create table t1 (a decimal);
          		 
          Query OK, 0 rows affected (0.00 sec)
          		 
           
          		 
          MariaDB [test]> show create table t1\G
          		 
          *************************** 1. row ***************************
          		 
                 Table: t1
          		 
          Create Table: CREATE TABLE `t1` (
          		 
            `a` decimal(10,0) DEFAULT NULL
          		 
          ) ENGINE=MyISAM DEFAULT CHARSET=latin1
          		 
          1 row in set (0.00 sec)

          serg Sergei Golubchik added a comment - It is documented: https://mariadb.com/kb/en/mariadb/decimal/ DECIMAL[(M[,D])] [UNSIGNED] [ZEROFILL] …If D is omitted, the default is 0. If M is omitted, the default is 10. Compare with: MariaDB [test]> create table t1 (a decimal); Query OK, 0 rows affected (0.00 sec)   MariaDB [test]> show create table t1\G *************************** 1. row *************************** Table: t1 Create Table: CREATE TABLE `t1` ( `a` decimal(10,0) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 1 row in set (0.00 sec)

          People

            serg Sergei Golubchik
            mikhail Mikhail Gavrilov
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            Dates

              Created:
              Updated:
              Resolved:

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