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https://issues.apache.org/jira/browse/SPARK-12745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15091314#comment-15091314
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Apache Spark commented on SPARK-12745:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/10689
> Limit is not supported inside Set Operation
> -------------------------------------------
>
> Key: SPARK-12745
> URL: https://issues.apache.org/jira/browse/SPARK-12745
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Xiao Li
>
> The current SQLContext allows the following query, which is copied from a
> test case in SQLQuerySuite:
> {code}
> checkAnswer(sql(
> """
> |select key from ((select * from testData limit 1)
> | union all (select * from testData limit 1)) x limit 1
> """.stripMargin),
> Row(1)
> )
> {code}
> However, it is rejected in the Hive parser.
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