Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9526#discussion_r44179146
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -175,6 +175,26 @@ object functions {
def avg(columnName: String): Column = avg(Column(columnName))
/**
+ * Aggregate function: returns a list of objects with duplicates.
+ *
+ * For now this is an alias for the collect_list Hive UDAF.
+ *
+ * @group agg_funcs
+ * @since 1.6.0
+ */
+ def collect_list(e: Column): Column = callUdf("collect_list", e)
--- End diff --
I think `callUdf` is deprecated and should be `callUDF`
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