Antoine Pitrou resolved ARROW-2339.
    Resolution: Later

This hasn't come up in user reports and is probably overkill for now. Any 
performance-critical operation should use bulk routines coded in C++ instead of 
micro-optimizing an inherently slow Python wrapper.

> [Python] Add a fast path for int hashing
> ----------------------------------------
>                 Key: ARROW-2339
>                 URL: https://issues.apache.org/jira/browse/ARROW-2339
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Alex Hagerman
>            Priority: Minor
> Create a __hash__ fast path for Int scalars that avoids using as_py().
> https://issues.apache.org/jira/browse/ARROW-640
> [https://github.com/apache/arrow/pull/1765/files/4497b69db8039cfeaa7a25f593f3a3e6c7984604]

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