Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/5604#issuecomment-97662163
we'd better make a new logical plan named `windows` just like `with`, and
do the transform work such as `windowToPlan` in analyzer instead of adding
this logical to hiveql since
1 hiveql.scala now is much a big object, adding more logical make it hard
to maintain
2 a windows logical plan is useful, we do not want do the same work for
window function support in all sql parsers(after the pluggable parser pr in, we
can plug in new parser)
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