Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/14723#discussion_r75586233 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/interfaces.scala --- @@ -389,3 +389,89 @@ abstract class DeclarativeAggregate def right: AttributeReference = inputAggBufferAttributes(aggBufferAttributes.indexOf(a)) } } + +/** + * This traits allow user to define an AggregateFunction which can store **arbitrary** Java objects --- End diff -- `This trait allows an AggregateFunction to use ...`
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