Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10689#issuecomment-170589671
@hvanhovell Let me share my two cents:
- We have another PR to push down `Limit` through `Union ALL`. However,
it is impossible to push `Limit` through `Union Distinct`:
https://github.com/apache/spark/pull/10451
- If we want to convert a logical plan back a SQL (in
https://github.com/apache/spark/pull/10541), we need to support it, I think.
@liancheng Please correct me, if my understanding is wrong.
- `Limit` is a super critical when the scale is huge. Our `Dataframe` API
can add this almost everywhere. In the long term, we should provide the same
functions for all the different interfaces, I think.
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