Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/5798#issuecomment-100648889
Thank you @cloud-fan & @marmbrus for the suggestion, I added 2 additional
classes `ExpressionSet` and `ExpressionMap`, since now is in the QA stage, I am
not going to follow pattern as `AttributeSet` or `AttributeMap` (that will lead
to many unused code added) completely for now and leave for the future
improvement if needed.
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