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  1. MariaDB Server
  2. MDEV-7773

Aggregate stored functions

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Details

    • 10.3.1-1, 10.3.1-2, 10.3.3-1

    Description

      With CREATE FUNCTION one can create functions in SQL, but this syntax doesn't allow one to create an aggregate function (like SUM, AVG, etc). This task is to add support for aggregate stored functions.

      Syntax

      is not decided yet. SQL Standard 2003 doesn't support aggregate stored functions (may be the newer standard does). Oracle, PostgreSQL, HSQL (may be more) all implement aggregate stored functions using their own incompatible syntax extensions. SQL Server and DB2 do not support creating new aggregate stored functions in SQL.

      The syntax should at least allow for

      • the code to return the function value
      • the code to be called per row in a group, it accumulates data, does not return a value
      • storage that is preserved between calls within a group

      and possibly

      • code to invoke between groups to reset the storage
      • code to remove data from the group (useful for window functions)

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14520 Custom aggregate functions work incorrectly with WITH ROLLUP clause

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24580 Aggregate stored function return always NULL in case of empty input set

          • Major - Major loss of function.
          • Open

          New Feature - A new feature of the product, which has yet to be developed. MCOL-523 support user defined aggregate functions

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-11263 Aggregate Window Functions

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

          Task - A task that needs to be done. MDEV-11301 SUGGESTION: Increase the number of Aggregate Functions

          • Major - Major loss of function.
          • Open

          Task - A task that needs to be done. MDEV-14564 support FOR loop in stored aggregate functions

          • Major - Major loss of function.
          • Stalled

          Bug - A problem which impairs or prevents the functions of the product. MDEV-28849 I_S tables don't tell that the stored function is AGGREGATE

          • Major - Major loss of function.
          • Open

          Activity

            People

              varun Varun Gupta (Inactive)
              serg Sergei Golubchik
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              3 Vote for this issue
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              14 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

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