Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/3827#issuecomment-68329848
@yanbohappy Actually, we can move the `copy` call to
[`execution.Sample.execute`] [1]. In this way, queries without sampling are not
negatively effected.
[1]:
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/basicOperators.scala#L73
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