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  1. MariaDB Server
  2. MDEV-6841

test decimal math

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    • Task
    • Status: Open (View Workflow)
    • Major
    • Resolution: Unresolved
    • N/A
    • None
    • None

    Description

      Even after all these years there is a steady stream of bugs in decimal math.
      We need a proactive approach instead, to try to find as many decimal bugs as
      possible.

      Suggestion: RQG testing of the expression

      ABS(CAST(a + b AS DOUBLE)/(CAST(a AS DOUBLE) + CAST(b AS DOUBLE)) - 1) < 0.0001

      where RQG randomly generates a and b, and the operation is one of +,
      -, *, /, mod.

      One should try also very small numbers (0.00...{~50 times}...01) as well as
      large ones.

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-6851 Decimal multiplication loses precision for no good reason

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-6852 Sequence of decimal division and multiplications returns 0 instead of the real result

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-6853 Unexpected zero result on 1 % <very small decimal> (wrong default precision of the returned result?)

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-6856 <negative value> MOD <fractional divisor> returns negative zero

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

          Activity

            People

              elenst Elena Stepanova
              serg Sergei Golubchik
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              Dates

                Created:
                Updated:

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