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  1. MariaDB Server
  2. MDEV-10838

Avoiding computation when window frame is always empty

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    Description

      Currently we allow constructs such as:

      [ROWS | RANGE] between N FOLLOWING and M FOLLOWING
      		 
      where N > M

      These constructs always lead to an empty frame. We correctly return results of NULL or 0 values for sum/window functions, however we perform a lot of unneeded IO operations. We can optimise this away by looking at frame definitions before starting computation.

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            gkodinov Georgi Kodinov
            cvicentiu Vicențiu Ciorbaru
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