Review Request: HIVE-2223: Add group by support for keys of type ARRAY and MAP.

[Jonathan Chang]

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https://reviews.apache.org/r/1745/
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Review request for hive.


Summary
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Adds hash codes for List and Map object inspectors.


Diffs
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Diff: https://reviews.apache.org/r/1745/diff


Testing
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Added unittest.


Thanks,

Jonathan