Github user burness commented on the pull request:
https://github.com/apache/spark/pull/13116#issuecomment-220838511
@hvanhovell Thank you for code review. In my project, I want to sample by
the specify num but in DataFrame or Dataset, there is only the sample by
fraction. And I have take these days , but it's not easy for me to resolve the
serious potential memory and performance problems(only add the line to require
that the sample num shouldn't bigger than the dataset's size).
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