Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/8592#discussion_r44086478
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/dsl/package.scala ---
@@ -162,6 +162,8 @@ package object dsl {
def stddev(e: Expression): Expression = Stddev(e)
def stddev_pop(e: Expression): Expression = StddevPop(e)
def stddev_samp(e: Expression): Expression = StddevSamp(e)
+ def collect_list(e: Expression): Expression = CollectList(e)
+ def collect_set(e: Expression): Expression = CollectSet(e)
--- End diff --
This is really only for easy building of test cases. To make it user
facing, just add it to
[fuctions.py](https://github.com/apache/spark/blob/master/python/pyspark/sql/functions.py)
and
[functions.scala](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/functions.scala)
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