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  1. MariaDB Server
  2. MDEV-6856

<negative value> MOD <fractional divisor> returns negative zero

Details

    • Bug
    • Status: Open (View Workflow)
    • Minor
    • Resolution: Unresolved
    • 5.5.40
    • 10.5, 10.6, 10.11, 11.4, 11.8
    • None
    • None

    Description

      It doesn't look very dangerous, just strange:

      MariaDB [test]> select -1 % 0.1;
      		 
      +----------+
      		 
      | -1 % 0.1 |
      		 
      +----------+
      		 
      |     -0.0 |
      		 
      +----------+
      		 
      1 row in set (0.00 sec)

      Same in MySQL 5.6. PostgreSQL returns a normal zero.

      Attachments

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-30044 The problem of the representation of zero in the MOD function

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-30546 The representation of 0 in division function in computing string

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-30547 Problems when mod , division function and extremum function are used together

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-30991 The representation of 0 in multiplication, pow function

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          relates to

          Task - A task that needs to be done. MDEV-6841 test decimal math

          • Major - Major loss of function.
          • Open

          Activity

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            serg Sergei Golubchik added a comment -

            see also SELECT mod('-12',-4);

            serg Sergei Golubchik added a comment - see also SELECT mod('-12',-4);
            serg Sergei Golubchik added a comment -

            and many other cases. Likely, dtoa needs to be changed to never generate "-0" string

            serg Sergei Golubchik added a comment - and many other cases. Likely, dtoa needs to be changed to never generate "-0" string

            People

              serg Sergei Golubchik
              elenst Elena Stepanova
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              Dates

                Created:
                Updated:

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