[GitHub] [arrow] AlenkaF commented on issue #34774: [Python] Interchange `pa.Table`'s `Column.null_count` doesn't count NaNs

["AlenkaF (via GitHub)" <gi...@apache.org>]

AlenkaF commented on issue #34774:
URL: https://github.com/apache/arrow/issues/34774#issuecomment-1490151014

   > cc @AlenkaF (let me know if not to tag you on things! coincidentally I was working on [data-apis/dataframe-interchange-tests#20](https://github.com/data-apis/dataframe-interchange-tests/issues/20) today when Ralf commented heh.)
   
   Do tag me please! =)
   Very cool you both jumped on it so quickly hehe.
   
   > I assume this is because Arrow does not treat NaNs as nulls, which semantically makes sense, but in the interchange protocol it should—see [vaexio/vaex#2120](https://github.com/vaexio/vaex/issues/2120) for a related discussion.
   
   But we agree with Maarten 😊  https://github.com/vaexio/vaex/issues/2120#issuecomment-1194047890
   There would be loss of information for all the libraries that actually differentiate between nan and null, right? 


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