Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/6005#discussion_r29965291
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -247,6 +247,22 @@ object functions {
def last(columnName: String): Column = last(Column(columnName))
/**
+ * Aggregate function: returns the average of the values in a group.
+ * Alias for avg.
+ *
+ * @group agg_funcs
+ */
+ def mean(e: Column): Column = avg(e)
+
+ /**
+ * Aggregate function: returns the average of the values in a group.
+ * Alias for avg.
+ *
+ * @group agg_funcs
+ */
+ def mean(columnName: String): Column = avg(columnName)
--- End diff --
So this is weird. It already seems to exist in Python
https://github.com/apache/spark/blob/35d6a99cbe3f67da5d56888e63baf9bc69f3de91/python/pyspark/sql/functions.py#L117
-- Not sure if it was just broken before
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