Hive: GroupBy should not pass the whole row from mapper to reducer ------------------------------------------------------------------
Key: HADOOP-4230
URL: https://issues.apache.org/jira/browse/HADOOP-4230
Project: Hadoop Core
Issue Type: Improvement
Components: contrib/hive
Reporter: Zheng Shao
Assignee: Namit Jain
We only need to pass fields that are needed.
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