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Posted to issues@spark.apache.org by "Davies Liu (JIRA)" <ji...@apache.org> on 2016/04/13 19:52:25 UTC

[jira] [Commented] (SPARK-14600) Push predicates through Expand

    [ https://issues.apache.org/jira/browse/SPARK-14600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15239688#comment-15239688 ] 

Davies Liu commented on SPARK-14600:
------------------------------------

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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