Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/11195#discussion_r52955323 --- Diff: sql/hive/src/test/scala/org/apache/spark/sql/hive/LogicalPlanToSQLSuite.scala --- @@ -105,6 +105,27 @@ class LogicalPlanToSQLSuite extends SQLBuilderTest with SQLTestUtils { checkHiveQl("SELECT id FROM t0 UNION ALL SELECT CAST(id AS INT) AS id FROM t0") } + test("union distinct") { + checkHiveQl("SELECT * FROM t0 UNION SELECT * FROM t0") + } + + // Parser is unable to parse the following query: + // 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 + ignore("three-child union") { --- End diff -- Thank you for your fast work! @viirya
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