Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5825#discussion_r29492442
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -1311,6 +1328,23 @@ def fill(self, value, subset=None):
fill.__doc__ = DataFrame.fillna.__doc__
+class DataFrameStatFunctions(object):
+ """Functionality for statistic functions with :class:`DataFrame`.
+ """
+
+ def __init__(self, df):
+ self.df = df
+
+ def cov(self, col1, col2):
+ if not isinstance(col1, str):
+ raise ValueError("col1 should be a string.")
+ if not isinstance(col2, str):
+ raise ValueError("col2 should be a string.")
+ return self.df._jdf.stat().cov(col1, col2)
+
+ cov.__doc__ = DataFrame.cov.__doc__
--- End diff --
if you do the doc assignment here, then you should move the implementation
to dataframe also ... or just put the doc assignment there. don't put the doc
in one place and implementation in another
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