Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/6173#issuecomment-103282541
I am not sure why we use the Map[Expression, NamedExpression] in
`patterns.scala`, seems `Seq[(Expression, NamedExpression)] is more reasonable,
which is definitely confusing for people why we couldn't using `Set/Map` for
expressions or should use them is a very ugly way.
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