Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/4592#discussion_r24719364
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -714,30 +714,45 @@ def count(self):
[Row(age=2, count=1), Row(age=5, count=1)]
"""
- @dfapi
- def mean(self):
+ def mean(self, *cols):
--- End diff --
There are lots of duplicated codes here, you could update the `dfapi` to
take any number of cols as arguments, then have a different implementation for
`count`.
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