Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3166
Scalar functions can of course not be executed by the source.
However, sources need to group the filter conditions into supported and
unsupported expressions in any case. Unsupported would also include "I don't
know this expression". So I think, there would not be additional implementation
overhead on the TableSource side but potential gains in performance when
pushing everything down.
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