Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/15513#discussion_r83645262 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala --- @@ -86,7 +86,13 @@ 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 set of unique elements. --- End diff -- Should this say 'list'? and it doesn't seem like they're unique, necessarily, given existing text?
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