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https://issues.apache.org/jira/browse/SPARK-7157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14513360#comment-14513360
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Reynold Xin commented on SPARK-7157:
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Since there is no key in DataFrame, either "sampleBy" or "stratifiedSample". We
need to decide if we want to allow composite expression, or just a single
expression.
> Add sampleByKey, sampleByKeyExact methods to DataFrame
> ------------------------------------------------------
>
> Key: SPARK-7157
> URL: https://issues.apache.org/jira/browse/SPARK-7157
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Joseph K. Bradley
> Priority: Minor
>
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