maropu commented on a change in pull request #28351:
URL: https://github.com/apache/spark/pull/28351#discussion_r418385825
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala
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@@ -139,6 +148,32 @@ case class CollectSet(
def this(child: Expression) = this(child, 0, 0)
+ /*
+ * SPARK-31500
+ * Array[Byte](BinaryType) Scala equality don't works as expected
+ * so HashSet return duplicates, we have to change types to drop
+ * this duplicates and make collect_set work as expected for this
+ * data type
Review comment:
Could you make this comment clearer for others and move it into the line
163-164?
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