[hive] redundant columns being passed in group by stage 1
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Key: HADOOP-4158
URL: https://issues.apache.org/jira/browse/HADOOP-4158
Project: Hadoop Core
Issue Type: Bug
Components: contrib/hive
Reporter: Namit Jain
Assignee: Namit Jain
In the first map-reduce stage, all input columns are copied currently. Instead,
we should walk over the filter and projections for that destination and only
copy columns which occur there
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