Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10451#issuecomment-167902518
After rethinking the `Limit` push-down rules, we are unable to push Limit
through any operator that could change the values or the number of rows. Thus,
so far, the eligible candidates are `Project`, `Union All` and
`Outer/LeftOuter/RightOuter Join`. Please correct me if my understanding is not
right.
Feel free to let me know if the codes need an update. Thank you!
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