Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/8403#issuecomment-134471917
Like the `buildScan` in data source, we shoud not expose internal types
outside spark sql, but we also need to provide the ability to build efficient
data source by using internal types directly(no conversions) for our build-in
data source or advanced users.
There maybe some cases that user need the internal types in Filter to avoid
converions and speed up operations, I think we need to improve our data source
API to make this stuff more flexible.
cc @liancheng
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