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Posted to dev@arrow.apache.org by "Ji Liu (Jira)" <ji...@apache.org> on 2019/10/11 10:32:00 UTC

[jira] [Created] (ARROW-6853) [Java] Support vector and dictionary encoder use different hasher for calculating hashCode

Ji Liu created ARROW-6853:
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             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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