[jira] [Created] (ARROW-5902) [Java] Implement HashTable for dictionary encoding

[Ji Liu (JIRA)]

Ji Liu created ARROW-5902:
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             Summary: [Java] Implement HashTable for dictionary encoding
                 Key: ARROW-5902
                 URL: https://issues.apache.org/jira/browse/ARROW-5902
             Project: Apache Arrow
          Issue Type: New Feature
            Reporter: Ji Liu
            Assignee: Ji Liu


As discussed in [https://github.com/apache/arrow/pull/4792]

Implement a hash table to only store hash & index, meanwhile add check equal 
function in ValueVector API.



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