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  1. Calcite
  2. CALCITE-3159

Distinct can be removed for MIN/MAX/BIT_OR/BIT_AND aggregate functions

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.20.0
    • Fix Version/s: 1.21.0
    • Component/s: core

      Description

      For the following query:

      select a, min(distinct b), bit_or(distinct c) from foo group by a;
      

      Currently Calcite still preserve the distinct for these aggregate functions, but DISTINCT is not meaningful with MIN/MAX and is available for ISO compatibility only. We can safely remove distinct and get more optimization opportunities.

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              • Assignee:
                danny0405 Danny Chen
                Reporter:
                hyuan Haisheng Yuan
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