Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10577#issuecomment-169242095
Major changes in the most recent commits:
- Combine the `Union`s during the construction (i.e., in the `DataFrame`
and `Dataset` APIs)
- Use tail recursion with extractor object to reimplement the rule
`CombineUnions`
- Rename the operator `Unions` to `Union`
- Fix a bug in HiveTypeCoercion
- Change the optimizer rule for pushing Filter and Project through
Unions.
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