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  1. MariaDB Server
  2. MDEV-38361

Followup to MDEV-36761: Indexes with NULLs-only and InnoDB statistics?

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Details

    • Bug
    • Status: Open (View Workflow)
    • Major
    • Resolution: Unresolved
    • 12.3
    • 12.3
    • Optimizer
    • None
    • Q1/2026 Server Maintenance

    Description

      MDEV-36761 has fixed optimizer choice for the case of indexed column having only NULL values.

      This MDEV is about studying if we can/need to do something for InnoDB.

      (does using nulls_ignored fix the problem with innodb or not? In which versions it is available and/or default? )

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-17295 Wrong cardinality with innodb_stats_method=nulls_ignored

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-36761 Query does not recognize advantage of using primary key index

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-38129 MariaDB Bug Report: Severe Performance Regression with cardinality<7 Indexes in LEFT JOIN

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

          Activity

            People

              oleg.smirnov Oleg Smirnov
              psergei Sergei Petrunia
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              Dates

                Created:
                Updated:

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