Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/18300#discussion_r123051866
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -112,6 +112,52 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
)
}
+ test("union by name") {
+ // Simple case
+ val df1 = Seq((1, "a", 3.0)).toDF("a", "b", "c")
+ val df2 = Seq((1.2, 2, "bc")).toDF("c", "a", "b")
+ val df3 = Seq(("def", 1.2, 3)).toDF("b", "c", "a")
+ val unionDf = df1.unionByName(df2.unionByName(df3))
+ checkAnswer(unionDf,
+ Row(1, "a", 3.0) :: Row(2, "bc", 1.2) :: Row(3, "def", 1.2) :: Nil
+ )
--- End diff --
Hi, @maropu .
To be clearer, could you add more test cases requiring type coercions here?
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