Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/11817#issuecomment-198648163
Rethink this issue, I think the issue described in the JIRA should not
related to pushdown of limit. Because the latest CollectLimit only takes few
rows (here is only 1 row) from the iterator of data, it should not scan all the
data. And I didn't see improvement from benchmark, so I close this now.
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