Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3743#discussion_r112636652
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/logical/operators.scala
---
@@ -54,6 +54,9 @@ case class Project(projectList: Seq[NamedExpression],
child: LogicalNode) extend
case expr if !expr.valid => u
case c @ Cast(ne: NamedExpression, tp) => Alias(c,
s"${ne.name}-$tp")
case gcf: GetCompositeField => Alias(gcf,
gcf.aliasName().getOrElse(s"_c$i"))
+ case over: OverCall if null != over.aggAlias =>
--- End diff --
Currently `.select('c, 'b.count over 'w as 'mycount)` would be translated
into `OverCall(Count(b), w, mycount, _)`. If we remove `as` from `OverCall`, it
will be wrapped in a regular `Alias` expression: `Alias(OverCall(Count(b), w,
_), mycount)`.
The syntax would be the same, but the internal representation would use the
existing `Alias` expression, just like any other expression that is renamed.
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