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  1. MariaDB Server
  2. MDEV-7487

Semi-join optimization for single-table update/delete statements

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    Description

      Currently, single-table UPDATE/DELETE statements cannot take advantage of semi-join optimizations. This is because semi-join optimizations are parts of join optimization (which is not invoked for single-table UPDATE/DELETE).

      This task is about

      • detecting UPDATE/DELETEs that can use semi-join optimizations
      • switching those queries to be processed as multi-table UPDATE/DELETEs. This will enable semi-join optimizations.

      Note that we do similar things for VIEWs: UPDATE multi_table_view SET =... is switched to be processed as multi-table UPDATE as soon as the server discovers that we're updating a multi-table VIEW.

      Attachments

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-33533 Crash at execution of DELETE when trying to use rowid filter

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-15385 Full scan instead of index lookup on single table DELETE ... WHERE IN (SELECT ...)

          • Major - Major loss of function.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-15385 Full scan instead of index lookup on single table DELETE ... WHERE IN (SELECT ...)

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

          Task - A task that needs to be done. MDEV-29547 prepare 10.11.0 preview releases

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

          New Feature - A new feature of the product, which has yet to be developed. MDEV-22415 Single table UPDATE/DELETE doesn't use non-semijoin Materialization

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-10447 different execution plan for single- and multi-DELETE

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14956 Slow deletes if number of deleted rows smaller then LIMIT

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-18561 Semi-Join optimization for single-table update

          • Major - Major loss of function.
          • Closed

          Activity

            People

              igor Igor Babaev
              psergei Sergei Petrunia
              Votes:
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              Watchers:
              15 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

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