Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/11195#discussion_r52851386
--- 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! @hvanhovell
Based on the comment by @rxin , I think we still need a nesting version
here for future extension, instead hacking the SQL generation.
Saw @viirya did a similar work last month:
https://github.com/apache/spark/pull/10660. Maybe @viirya can do me a favor for
completing this? Thank you! : )
Also cc @liancheng
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