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  1. MariaDB Server
  2. MDEV-24943

Add FILTER clause

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Details

    • Aggregate functions now support the SQL standard FILTER clause, letting you filter which rows are included in an aggregation without writing a CASE expression.
    • Q1/2026 Server Development, Q1/2026 Server Maintenance, Q2/2026 Server Development, Q3/2026 Server Maintenance, Q3/2026 Server Development, Q4/2026 Server Maintenance

    Description

      SQL:2003 introduced the FILTER clause, which extends aggregate functions with a WHERE clause.

      This is supported by PostgreSQL, SQLite and a MySQL extension.

      See https://modern-sql.com/feature/filter#conforming-alternatives for details.

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        Issue Links

          blocks

          Task - A task that needs to be done. MDBF-690 ArrayAgg (and related functions) are missing from Django

          • Major - Major loss of function.
          • Open
          is part of

          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. MDEV-35388 PostgreSQL-compatible syntax

          • Major - Major loss of function.
          • Open

          Task - A task that needs to be done. MDEV-41087 prepare 13.2 preview

          • Blocker - Blocks development and/or testing work, production could not run.
          • In Progress
          relates to

          Task - A task that needs to be done. MCOL-6534 Compatibility of the FILTER clause (added in MDEV-24943) with MCS select handler

          • Major - Major loss of function.
          • In Testing

          Bug - A problem which impairs or prevents the functions of the product. MDEV-40689 Wrong result: BIT_AND/BIT_OR/BIT_XOR in WINDOW functions over a frame containing NULL

          • Major - Major loss of function.
          • Open
          links to

          Web Link Bill Wallis LinkedIn showing FILTER as simplier than CASE

          Web Link django - noting omission

          Web Link Markus Winand LinkedIn plea for implementation

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            People

              Khaled.amr Khaled Amr
              greenman Ian Gilfillan
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