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https://issues.apache.org/jira/browse/SPARK-14191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-14191.
--------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.0

Issue resolved by pull request 11995
[https://github.com/apache/spark/pull/11995]

> Fix Expand operator constraints
> -------------------------------
>
>                 Key: SPARK-14191
>                 URL: https://issues.apache.org/jira/browse/SPARK-14191
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Liang-Chi Hsieh
>             Fix For: 2.0.0
>
>
> Expand operator now uses its child plan's constraints as its valid 
> constraints (i.e., the base of constraints). This is not correct because 
> Expand will set its group by attributes to null values. So the nullability of 
> these attributes should be true.



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