Github user gatorsmile commented on the pull request: https://github.com/apache/spark/pull/10630#issuecomment-170189804 In this update, the code changes include - Fixed a bug in `Range` by inheriting the trait `MultiInstanceRelation`. - Added a de-duplication resolution for all the binary nodes: `Except`, `Union` and `Co-Group`, besides `Intersect` and `Join`. - Added a new function `duplicateResolved` for all the binary nodes. - Improved the analysis exception message when failure to resolve conflicting references - Resolved all the other comments. The analysis procedure is kind of tricky. I am unable to directly include `duplicateResolved` into `childrenResolved`. `resolve` is lazy evaluated. The resolution procedure need to follow the order: children at first, then itself, and then deduplicate the attributes' expression IDs in tis children.
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