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https://issues.apache.org/jira/browse/SPARK-12213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai resolved SPARK-12213.
------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.0

Issue resolved by pull request 10228
[https://github.com/apache/spark/pull/10228]

> Query with only one distinct should not having on expand
> --------------------------------------------------------
>
>                 Key: SPARK-12213
>                 URL: https://issues.apache.org/jira/browse/SPARK-12213
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Davies Liu
>            Assignee: Davies Liu
>             Fix For: 2.0.0
>
>
> Expand will double the number of records, slow down projection and 
> aggregation, it's better to generate a plan without Expand for a query with 
> only one distinct (for example, ss_max in TPCDS)



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