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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