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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/02/13 13:31:03 UTC

[GitHub] [arrow-rs] alamb commented on pull request #1263: Implement DictionaryArray support in eq_dyn

alamb commented on pull request #1263:
URL: https://github.com/apache/arrow-rs/pull/1263#issuecomment-1038119096


   > I was wondering, what does the arrow spec say about dictionary values being null? Probably no one uses that combination, but in theory, a valid key could map to a null value.
   
   https://arrow.apache.org/docs/format/Columnar.html#dictionary-encoded-layout
   
   says explicitly
   
   > Note that a dictionary is permitted to contain duplicate values or nulls:
   
   


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