Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/8356#issuecomment-133674846
Hey @cloud-fan, [Michael's comment] [1] reminds me that I had actually
discussed once with Michael whether we should remove `CatalystScan`, and the
conclusion was we can keep it there as an experimental interface. It would be
convenient to experiment with new data sources since Catalyst expression
classes are more flexible.
[1]: https://github.com/apache/spark/pull/3269/files#r37668626
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