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https://issues.apache.org/jira/browse/SPARK-18365?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-18365.
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Resolution: Fixed
Fix Version/s: 2.1.0
Issue resolved by pull request 15815
[https://github.com/apache/spark/pull/15815]
> Improve Documentation for Sample Methods
> ----------------------------------------
>
> Key: SPARK-18365
> URL: https://issues.apache.org/jira/browse/SPARK-18365
> Project: Spark
> Issue Type: Bug
> Reporter: Bill Chambers
> Fix For: 2.1.0
>
>
> The documentation for sample is a little unintuitive. It was difficult to
> understand why I wasn't getting exactly the fraction specified of my total
> DataFrame rows. The PR clarifies the documentation for Scala, Python, and R
> to explain that that is expected behavior.
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