Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3520
Sure, a `FilterableTableSource` can implement its accepted predicates as it
likes.
However, I think we could expect that `getPredicates()` returns the
accepted filter expressions as it got them. This makes it easier to check a
correct behavior of the `FilterableTableSource`. Internally, the accepted
expressions can be decomposed or otherwise changed.
Similarly, we would need to check that the Expressions which remain in the
mutable list are also present in the input list.
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