Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/2653
Hi @wuchong, I think @twalthr's main concerns are not about the parser, but
rather that expressions and logical nodes are mixed, especially in the Scala
Table API where the `TableFunction` is implicitly converted into a
`LogicalNode` and not into an `Expression`.
If I got it right, @twalthr would like to implicitly convert the
`TableFunction` into an `Expression` at the API level and later internally into
a `LogicalNode`.
Please correct me if I didn't get that right @twalthr.
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