Make the hashmap in map-side group by pluggable
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Key: HIVE-2555
URL: https://issues.apache.org/jira/browse/HIVE-2555
Project: Hive
Issue Type: New Feature
Reporter: Namit Jain
There are a couple of implementations available (other than java.util.HashMap)
- COLT, TROVE etc. to name a few.
If the hashmap was pluggable, it would be easy to play around with different
hash maps and tune performance.
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