planga82 commented on a change in pull request #28351:
URL: https://github.com/apache/spark/pull/28351#discussion_r418003415
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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 +147,35 @@ 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
+ */
+ override lazy val bufferElementType = child.dataType match {
+ case BinaryType => ArrayType(BinaryType)
+ case other => other
+ }
+
+ override def convertToBufferElement(value: Any): Any = {
+ val v = InternalRow.copyValue(value)
Review comment:
Yes it's true. Cleaner in that way
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