Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/11005#issuecomment-178978949
Is `PrunedFilteredScan` and `CatalystScan` conflicting? If not, can we keep
original `JDBCRelation` and let it implement `CatalystScan` too? In order not
to duplicate current codes, I am wondering if `SQLBuilder` can help converting
filtering expressions to SQL string.
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