Ji Liu created ARROW-6853:

             Summary: [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

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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