Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/2475#issuecomment-57281203
Considering from a user's perspective, mixing all kinds of data sources is
cool, but correspond to `TableScan`, we also need a `TableInsert` trait to
close the loop. Usually a foreign data source should implement `TableScan`, and
optionally implement `TableInsert`, which should be generally easier to
implement than the former.
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