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  1. MariaDB Server
  2. MDEV-36094

Row ID filtering for reverse-ordered scans

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    Description

      MDEV-34413 mentions, in passing, that we may be able to re-enable row ID filtering for reverse-ordered scans. Disabled by default in prepare_for_reverse_ordered_access (see sql_select.cc), rowid filtering was causing a significant performance regression in some cases (such as MDEV-33875).

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-33875 ORDER BY DESC causes ROWID Filter optimization performance degradation

          • Major - Major loss of function.
          • Closed

          New Feature - A new feature of the product, which has yet to be developed. MDEV-34413 Index Condition Pushdown for reverse-ordered scans

          • Major - Major loss of function.
          • Closed

          Activity

            Ascending order - Click to sort in descending order
            psergei Sergei Petrunia added a comment -

            Review input provided

            psergei Sergei Petrunia added a comment - Review input provided
            lstartseva Lena Startseva added a comment -

            Testing done. Ok to push

            lstartseva Lena Startseva added a comment - Testing done. Ok to push

            People

              Gosselin Dave Gosselin
              Gosselin Dave Gosselin
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              Dates

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                Updated:
                Resolved:

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