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https://issues.apache.org/jira/browse/SPARK-4860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen resolved SPARK-4860.
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Resolution: Fixed
Fix Version/s: 1.3.0
Issue resolved by pull request 3764
[https://github.com/apache/spark/pull/3764]
> Improve performance of sample() and takeSample() on SchemaRDD
> --------------------------------------------------------------
>
> Key: SPARK-4860
> URL: https://issues.apache.org/jira/browse/SPARK-4860
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Reporter: Davies Liu
> Fix For: 1.3.0
>
>
> In SchemaRDD, all the rows are already serialized into Java objects, so it's
> possible to call sample()/takeSample() of JavaSchemaRDD() in Python, which
> will be much faster than the current approach (implemented in pure Python).
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