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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.
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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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