Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/15513#discussion_r85625172 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala --- @@ -86,7 +86,11 @@ abstract class Collect extends ImperativeAggregate { * Collect a list of elements. */ @ExpressionDescription( - usage = "_FUNC_(expr) - Collects and returns a list of non-unique elements.") + usage = "_FUNC_(expr) - Collects and returns a list of non-unique elements.", + extended = """ + Arguments: + expr - an expression of any type that represents data to collect as a list. --- End diff -- ```sql spark-sql> SELECT collect_list(array(1)), collect_list(struct(1)), collect_list(map(1, 1)); [[1]] [{"col1":1}] [{1:1}] ```
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