Ji Liu created ARROW-5835:
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Summary: [Java] Support Dictionary Encoding for binary type
Key: ARROW-5835
URL: https://issues.apache.org/jira/browse/ARROW-5835
Project: Apache Arrow
Issue Type: New Feature
Components: Java
Reporter: Ji Liu
Assignee: Ji Liu
Now is not implemented because byte array is not supported to be HashMap key.
One possible way is that wrap them with something to implement equals and
hashcode.
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