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https://issues.apache.org/jira/browse/SPARK-14600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15239688#comment-15239688
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Davies Liu commented on SPARK-14600:
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cc [~cloud_fan]
> Push predicates through Expand
> ------------------------------
>
> Key: SPARK-14600
> URL: https://issues.apache.org/jira/browse/SPARK-14600
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
>
> A grouping sets will be analyzed as Aggregate(Expand(Project)), the grouping
> attributes came from Project, but have different meaning in Project (equal to
> original grouping expression) and Expand (could be original grouping
> expression or null), this does not make sense, because the attribute has
> different result in different operator,
> A better way could be Aggregate(Expand()), then we need to fix SQL
> generation.
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