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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/08/10 00:05:31 UTC

[GitHub] [arrow-datafusion] sundy-li commented on issue #846: Improve grouping performance by special casing small / fixed size keys

sundy-li commented on issue #846:
URL: https://github.com/apache/arrow-datafusion/issues/846#issuecomment-895631463


   If a column is nullable, we can use another byte to store the nullable bits.
   
   If  [u8, u8, u16] are all nullable, u64 key can be used.


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