Github user KurtYoung commented on the issue:
https://github.com/apache/flink/pull/3520
Hi @fhueske, you just pointed out a question i had when tonycox
implementing the first version. Why we are preventing `FilterableTableSource`
from modifying the expressions? I think it's totally up to them whether
changing the expressions they took or keep them just they were. We have not
reason to restrict the `FilterableTableSource`'s behavior if they just do the
things right.
Pass in a java list and told user who extending this to pick and remove the
expressions the support is not super nice. But even if user just pick
expressions but not remove them, we still get the correct answer.
What do you think?
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