maropu commented on a change in pull request #28351:
URL: https://github.com/apache/spark/pull/28351#discussion_r417045797
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameAggregateSuite.scala
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@@ -528,6 +536,17 @@ class DataFrameAggregateSuite extends QueryTest
df.select(collect_set($"a"), sort_array(collect_set($"b"))),
Seq(Row(Seq(1, 2, 3), Seq(Row(2, 2), Row(4, 1))))
)
+
+ val a = "aa".getBytes
+ val b = "bb".getBytes
+ val c = "cc".getBytes
+ val d = "dd".getBytes
+ val df1 = Seq((a, b), (a, b), (c, d))
+ .toDF("x", "y")
+ .select(struct($"x", $"y").as("a"))
+ val ret = df1.select(collect_set($"a")).collect()
+ .map(r => r.getAs[mutable.WrappedArray[_]](0)).head
+ assert(ret.length == 2)
Review comment:
Could you move the new tests into a new test unit like
`test("SPARK-31500: collect_set() of BinaryType returns duplicate elements") {
..}`?
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