ASF GitHub Bot commented on ARROW-1942:

xuepanchen commented on issue #1551: ARROW-1942: [C++] Hash table 
specializations for small integers
URL: https://github.com/apache/arrow/pull/1551#issuecomment-364520515
   @wesm got you. Compute-benchmark test failed when I run it locally and I 
can't figure out why. It seems to fail too before I added the 8-bit integer case

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> [C++] Hash table specializations for small integers
> ---------------------------------------------------
>                 Key: ARROW-1942
>                 URL: https://issues.apache.org/jira/browse/ARROW-1942
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Panchen Xue
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.9.0
> There is no need to use a dynamically-sized hash table with uint8, int8, 
> since a fixed-size lookup table can be used and avoid hashing altogether

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