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https://issues.apache.org/jira/browse/SPARK-5583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14304624#comment-14304624
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Apache Spark commented on SPARK-5583:
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User 'scwf' has created a pull request for this issue:
https://github.com/apache/spark/pull/4354
> Support unique join in hive context
> -----------------------------------
>
> Key: SPARK-5583
> URL: https://issues.apache.org/jira/browse/SPARK-5583
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.2.0
> Reporter: wangfei
>
> Support unique join in hive context:
> FROM UNIQUEJOIN PRESERVE T1 a (a.key), PRESERVE T2 b (b.key), PRESERVE T3 c
> (c.key)
> SELECT a.key, b.key, c.key;
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