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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/04/04 18:11:35 UTC

[GitHub] [arrow-datafusion] alamb commented on issue #1184: Null constants can not be used in most expressions

alamb commented on issue #1184:
URL: https://github.com/apache/arrow-datafusion/issues/1184#issuecomment-1087862440

   Thanks @WinkerDu  
   
   I can't remember how far I got with this one. If I were doing this project what I would do is try and change the code so that a `Null` constant (aka `ScalarValue` with an embedded `None`) as `DataType::Null` and then implement coercion rules for DataType::Null <--> All other types.
   
   I tried this at some point and I think I hit issues in `arrow-rs` 's `cast` kernel not knowing how to cast from `Null` to other types, which has since been fixed I think 


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