Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/5208#issuecomment-88772266
@adrian-wang I leave some comments, but I need some more time in review the
code of `SortMergeJoin`, will keep add more comments later. BTW, can you double
check if it's reasonable for the `null` value returned in the
`SortMergeJoin.Iterator.next`?
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