Liang-Chi Hsieh created SPARK-13321:
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Summary: 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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