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Posted to github@arrow.apache.org by "alamb (via GitHub)" <gi...@apache.org> on 2023/07/17 12:47:54 UTC

[GitHub] [arrow-datafusion] alamb commented on issue #5472: Speed up `DistinctCountAccumulator`

alamb commented on issue #5472:
URL: https://github.com/apache/arrow-datafusion/issues/5472#issuecomment-1638071930

   I think we could make COUNT DISTINCT go much faster if implemented via `HashSet<ArrowPrimitiveType>`. If that was implemented as a `GroupsAccumuluator` I suspect COUNT DISTINCT would be relatively screaming


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