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https://issues.apache.org/jira/browse/SPARK-16596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15381553#comment-15381553
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Apache Spark commented on SPARK-16596:
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User 'ericl' has created a pull request for this issue:
https://github.com/apache/spark/pull/14241
> Refactor DataSourceScanExec to do partition discovery at execution instead of
> planning time
> -------------------------------------------------------------------------------------------
>
> Key: SPARK-16596
> URL: https://issues.apache.org/jira/browse/SPARK-16596
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Eric Liang
> Priority: Minor
>
> Partition discovery is rather expensive, so we should do it at execution time
> instead of during physical planning. Right now there is not much benefit
> since ListingFileCatalog will read scan for all partitions at planning time
> anyways, but this can be optimized in the future.
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