Github user maropu commented on the pull request:
https://github.com/apache/spark/pull/11005#issuecomment-179135955
I agree that `CatalystScan` is used to support arithmetic operations in
datasources though, this current `CatalystScan` trait only processes filter
expressions. If we make this kind of interface changes, it'd be better to
consider other requirements discussed in jira; otherwise, we get stuck with the
same issue every time we add new features in datasources.
Anyway, the idea to share codes in `SQLBuilder` and `JDBCRDD` is good to me.
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