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  1. MariaDB ColumnStore
  2. MCOL-4603

Replace long double with wide/narrow-decimal for avg() and sum() result type for all numerical datatypesdecimal result

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Details

    • New Feature
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 6.1.1
    • 6.1.1
    • ExeMgr, PrimProc
    • None
    • 2021-5, 2021-6, 2021-8, 2021-9

    Description

      As of now MCS uses long double as an internal data for results of avg() and sum() for numerical data types columns except wide-decimal.
      This approach imposes a number of limitations, e.g. we can not safely join on the aggregates results being a float number. Presumably long double math operations are slower comparing to int128.
      This gets us to the point of replacing long double with wide-decimal as a result of avg() and sum() for all integer data types. This causes a wide consequences that covers lots of facilities of the code. The full list can be obtained by search for LONGDOUBLE in the repo.

      Attachments

        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. MCOL-4667 Precision loss on AVG(decimal)

          • Major - Major loss of function.
          • Open
          includes

          Bug - A problem which impairs or prevents the functions of the product. MCOL-4548 Regression: expression in HAVING clause not working right abs(avg())

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MCOL-4492 Aggregated DOUBLES (AVG and SUM) do not compare properly, especially with constants and non aggregated doubles.

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed
          is part of

          New Feature - A new feature of the product, which has yet to be developed. MCOL-641 Full DECIMAL support in ColumnStore

          • Major - Major loss of function.
          • Closed

          Activity

            People

              dleeyh Daniel Lee (Inactive)
              drrtuy Roman
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              Dates

                Created:
                Updated:
                Resolved:

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