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https://issues.apache.org/jira/browse/SPARK-2327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14047495#comment-14047495
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Takuya Ueshin commented on SPARK-2327:
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PRed: https://github.com/apache/spark/pull/1266
> Fix nullabilities of Join/Generate/Aggregate.
> ---------------------------------------------
>
> Key: SPARK-2327
> URL: https://issues.apache.org/jira/browse/SPARK-2327
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Takuya Ueshin
>
> Fix nullabilities of Join/Generate/Aggregate because:
> - Output attributes of opposite side of {{OuterJoin}} should be nullable.
> - Output attributes of generater side of {{Generate}} should be nullable if
> {{join}} is {{true}} and {{outer}} is {{true}}.
> - {{AttributeReference}} of {{computedAggregates}} of {{Aggregate}} should be
> the same as {{aggregateExpression}}'s.
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