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https://issues.apache.org/jira/browse/SPARK-8007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14630897#comment-14630897
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Reynold Xin commented on SPARK-8007:
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[~jd] Take a look at this:
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala#L146
> Support resolving virtual columns in DataFrames
> -----------------------------------------------
>
> Key: SPARK-8007
> URL: https://issues.apache.org/jira/browse/SPARK-8007
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> Create the infrastructure so we can resolve df("SPARK__PARTITION__ID") to
> SparkPartitionID expression.
> A cool use case is to understand physical data skew:
> {code}
> df.groupBy("SPARK__PARTITION__ID").count()
> {code}
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