Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10630#issuecomment-169913342
In this update, the code changes include
- Added `DISTINCT` on top of `Semi Join` for `Intersect`
- Added a test case for detecting if the duplicate values are removed
after `Intersect`
- Threw an exception if the `Intersect` is not converted before
conversion from logical plan to physical plan
- Merge two rules `ReplaceIntersectWithSemiJoin` and
`ReplaceDistinctWithAggregate` in the same batch `"Replace Operators"` for
ensuring `ReplaceIntersectWithSemiJoin` should be called before
`ReplaceDistinctWithAggregate`
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