[hive] redundant expression evaluation in group by stage 1
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Key: HADOOP-4157
URL: https://issues.apache.org/jira/browse/HADOOP-4157
Project: Hadoop Core
Issue Type: Bug
Components: contrib/hive
Reporter: Namit Jain
We can be smarter in terms of this list of what parameters we evaluate in the
first stage, we should only evaluate those that are common across the group by
clauses.
All expressions and aggregation function parameters are evaluated in the first
stage thereby increasing data flow. It might be better to only evaluate common
expressions
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