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From fhueske <...@git.apache.org>
Subject [GitHub] flink issue #3166: [FLINK-3849] Add FilterableTableSource interface and Rule...
Date Mon, 30 Jan 2017 20:15:06 GMT
Github user fhueske commented on the issue:

    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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