ASF GitHub Bot updated ARROW-6853:
    Labels: pull-request-available  (was: )

> [Java] Support vector and dictionary encoder use different hasher for 
> calculating hashCode
> ------------------------------------------------------------------------------------------
>                 Key: ARROW-6853
>                 URL: https://issues.apache.org/jira/browse/ARROW-6853
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Java
>            Reporter: Ji Liu
>            Assignee: Ji Liu
>            Priority: Major
>              Labels: pull-request-available
> Hasher interface was introduce in ARROW-5898 and now have two different 
> implementations ({{MurmurHasher and SimpleHasher}}) and it could be more in 
> the future.
> And currently {{ValueVector#hashCode}} and {{DictionaryHashTable}} only use 
> {{SimpleHasher}} for calculating hashCode. This issue enables them to use 
> different hasher or even user-defined hasher for their own use cases.

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