Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10577#issuecomment-169216470
Major changes in this commit:
- Combine the Union during the construction (i.e., in the DataFrame and
Dataset APIs)
- Use tail recursive with extractor object to reimplement the rule
`CombineUnions`
- Rename the operator `Unions` to `Union`
- Fix bugs
Todo:
- Change the optimizer rule for pushing Filter and Project through
Unions.
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