[GitHub] spark pull request: [SPARK-13321][SQL] Add nested union test cases

[hvanhovell <gi...@git.apache.org>]

Github user hvanhovell commented on a diff in the pull request:

    https://github.com/apache/spark/pull/11361#discussion_r58171387
  
    --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/parser/PlanParserSuite.scala ---
    @@ -426,4 +428,68 @@ class PlanParserSuite extends PlanTest {
           "Number of aliases must match the number of fields in an inline table.")
         intercept[ArrayIndexOutOfBoundsException](parsePlan("values (1, 'a'), (2, 'b', 5Y)"))
       }
    +
    +  test("nesting UNION") {
    +    val parsed = parsePlan(
    +      """
    +       |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
    +      """.stripMargin)
    +
    +    val expected = Project(
    --- End diff --
    
    Minor: @viirya could you update this use the DSL and `assertEqual` equals? It makes this a bit easier to read. 
    
    BTW this test is very similar to the following test case: https://github.com/apache/spark/blob/master/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/parser/PlanParserSuite.scala#L384-L392


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