Explain should show output column names
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Key: HIVE-670
URL: https://issues.apache.org/jira/browse/HIVE-670
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Zheng Shao
Explain currently only shows the expressions (in which it references the output
column names of the last operator).
However, it does not show the output column names of the last operator, which
makes it hard to debug.
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