Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/13116#issuecomment-219546005
@burness thanks for working on this. The PR in its current state has some
serious potential memory and performance problems (see the comments). What is
the usecase for this? If you do want to press ahead you will need to take a
look at the physical `SampleExec` operator and somekind of limit to that.
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