Liya Fan created ARROW-5898:
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             Summary: [Java] Provide functionality to efficiently compute hash 
code for arbitrary memory segment
                 Key: ARROW-5898
                 URL: https://issues.apache.org/jira/browse/ARROW-5898
             Project: Apache Arrow
          Issue Type: New Feature
          Components: Java
            Reporter: Liya Fan
            Assignee: Liya Fan


This issue adds a functionality to efficiently compute  the hash code for a 
consecutive memory region. This functionality is important in practical 
scenarios because it helps:

* Avoid unnecessary memory copy.

* Avoid repeated conversions between Java objects & Arrow buffers. 

Since the algorithm for calculating hash code has  significant performance 
implications, we need to design an interface so that different algorithms can 
be easily introduces as a plug-in.



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