Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10577#issuecomment-171560242
In this update, the major changes include
- Added a new analyzer rule `EliminateUnions` for remove the union with a
single child.
- Rewrote the function `widenOutputTypes`. Now, it stops if finding the
first column that is not type-coerce-able among children.
- Modified the function `collectUnionChildren` by replacing `ArrayBuffer`
by `Stack`.
- Addressed the other comments and fixed the style issues.
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