Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5825#discussion_r29490587
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -1311,6 +1329,28 @@ 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):
--- End diff --
Slightly weird, but probably better than the two falling out of sync.
You can also say
```
:func:`DataFrame.cov` and :func:`DataFrameStatFunctions.cov` are aliases.
```
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