Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/4520#issuecomment-73911621
LGTM in general except some of the minor issues.
My original thought on this, is adding a new `Project` on top of the
`MultiInstanceRelation`(if it appears more than once in the query tree), so we
can still keep the same reference to the original instance, this probably give
us an opportunity to optimize the query by only computing once for the
`MultiInstanceRelation`.
Anyway, let's leave it for the future improvement.
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