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https://issues.apache.org/jira/browse/SPARK-13321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15146946#comment-15146946
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Apache Spark commented on SPARK-13321:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/11204
> Support nested UNION in parser
> ------------------------------
>
> Key: SPARK-13321
> URL: https://issues.apache.org/jira/browse/SPARK-13321
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> The following SQL can not be parsed with current parser:
> {code}
> SELECT `u_1`.`id` FROM (((SELECT `t0`.`id` FROM `default`.`t0`) UNION ALL
> (SELECT `t0`.`id` FROM `default`.`t0`)) UNION ALL (SELECT `t0`.`id` FROM
> `default`.`t0`)) AS u_1
> {code}
> We should fix it.
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