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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/05/12 17:25:02 UTC

[GitHub] [arrow-datafusion] Dandandan opened a new issue #331: Implement vectorized hashing for dictionary types

Dandandan opened a new issue #331:
URL: https://github.com/apache/arrow-datafusion/issues/331


   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   Currently only primitive types and string types are supported as dictionary keys.
   For hash join and hash aggregate we need to hash values.
   
   **Describe the solution you'd like**
   Implement dictionary type in `create_hashes` function.
   
   **Describe alternatives you've considered**
   n/a
   
   **Additional context**
   Dictionary types are supported for group by now via `create_key_for_col`. There is an explicit check on using hash repartitioning for dictionary keys in the physical planner. This check can be removed when dictionaries are supported in  `create_hashes`.
   


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