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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/01/01 12:30:44 UTC

[GitHub] [arrow] jhorstmann commented on pull request #9038: ARROW-10356: [Rust][DataFusion] Add support for is_in (WIP)

jhorstmann commented on pull request #9038:
URL: https://github.com/apache/arrow/pull/9038#issuecomment-753311070


   An alternative implementation would be to translate `x IN ('ABC', 'DEF', 'GHI')` into `(x = 'ABC') OR (x = 'DEF') OR (x = 'GHI')` on the logical plan level. That should handle nulls correctly and for a short set of values it should also have good performance since there are special comparison kernels for comparing against literals. For a larger set of values the `contains` might be more performant because of the possibility for returning early.


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