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  1. MariaDB Server
  2. MDEV-16327

Server doesn't account for engines that supports OFFSET on their own.

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Details

    • Task
    • Status: Closed (View Workflow)
    • Critical
    • Resolution: Fixed
    • None
    • 10.5.0
    • Optimizer
    • None

    Description

      It comes out that server doesn't honors group by handlers that supports OFFSET on their own and the server code in select_send::send_data tries to reapply OFFSET to the set returned by the handler[1]

      select i from t1 group by i limit 10,20; # Start from offset 10

      There is only engine that supports both group by handler and internal sorting ATM, so one could reproduce this only with columnstore engine built of:

      • develop branch columnstore fork of the server's code
      • develop branch columnstore engine

      1. https://hastebin.com/afepesalez.cs

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        Issue Links

          is part of

          New Feature - A new feature of the product, which has yet to be developed. MCOL-1052 Implement GROUP BY pushdown support

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MCOL-3903 Performance regression in INSERT..SELECT

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

          Task - A task that needs to be done. MDEV-18553 Make LIMIT/OFFSET processing uniform

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

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              sanja Oleksandr Byelkin
              drrtuy Roman
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