Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/12268#issuecomment-207694129
I have two things to note.
- It looks `buildInternalScan()` is not called but just remaining. Just in
case I did not remove this and tested this.
- It looks the changes are a lot but the logics and filtering are not
changed much except that it uses `Iterator` instead of `Reader`.
- Performance was tested with this patch. This can be found in
https://issues.apache.org/jira/browse/SPARK-14480.
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