Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/14749#discussion_r75783595
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala
---
@@ -54,6 +54,10 @@ abstract class Collect extends ImperativeAggregate {
override def inputAggBufferAttributes: Seq[AttributeReference] = Nil
+ // Both `CollectList` and `CollectSet` are non-deterministic since their
results depend on the
+ // actual order of input rows.
+ override def deterministic: Boolean = false
--- End diff --
Yea. Also, there's no set type in Spark SQL, thus the result set is
actually just a list without duplicated elements.
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