Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16564#discussion_r96355556
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala
---
@@ -898,11 +899,15 @@ class DatasetSuite extends QueryTest with
SharedSQLContext {
(1, 2), (1, 1), (2, 1), (2, 2))
}
- test("dropDuplicates should not change child plan output") {
- val ds = Seq(("a", 1), ("a", 2), ("b", 1), ("a", 1)).toDS()
- checkDataset(
- ds.dropDuplicates("_1").select(ds("_1").as[String],
ds("_2").as[Int]),
- ("a", 1), ("b", 1))
+ test("SPARK-19065 dropDuplicates should not create expressions using the
same id") {
--- End diff --
It seems weird to me that adding a test to verify that we don't support
some feature, so I just added my previous regression test back in order to have
a test to catch this issue.
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