Github user marmbrus commented on the pull request: https://github.com/apache/spark/pull/11509#issuecomment-192441294 @davies agree, we should have a default internalScan that delegates to external version while doing the `Row` => `InternalRow`. We can then make that method `private[spark]` so that only we can override it. I'd also really like to get rid of RDDs here so that we can manage broadcasting the conf, etc. [SPARK-13682](https://issues.apache.org/jira/browse/SPARK-13682) tracks finalizing this interface.
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