Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/4186#issuecomment-72150031
Hey, @chenghao-intel, I think we can not eliminate the `MultiAlias` since
Generator (UDTF) is not namedExpression which will leads to
java.lang.ClassCastException: org.apache.spark.sql.hive.HiveGenericUdtf cannot
be cast to org.apache.spark.sql.catalyst.expressions.NamedExpression
Project require the projectList must be NamedExpression.
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