Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1870#issuecomment-208542966
Hi @yjshen, thanks for the PR! I agree, moving the `RexNode` translation to
the individual `Expression` makes a lot of sense. I only skimmed the PR and did
not have a detailed look but everything looks fine.
Will check the PR more thoroughly tomorrow and probably merge it.
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