[jira] [Resolved] (SPARK-19091) createDataset(sc.parallelize(x: Seq)) should be equivalent to createDataset(x: Seq)

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-19091?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-19091.
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    Resolution: Incomplete

> createDataset(sc.parallelize(x: Seq)) should be equivalent to createDataset(x: Seq)
> -----------------------------------------------------------------------------------
>
>                 Key: SPARK-19091
>                 URL: https://issues.apache.org/jira/browse/SPARK-19091
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Josh Rosen
>            Priority: Major
>              Labels: bulk-closed
>
> It turns out that spark.createDataset(sc.parallelize(x: Seq)) and spark.createaDataSet(x: Seq) produce different plans, where the former is much less efficient due to a lack of accurate size estimation. We should modify SparkSession to special-case the situation where createDataset is called on a ParallelCollectionRDD in order to remove this source of performance variation between the two plans.



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