Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5825#discussion_r29489916
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -868,6 +875,17 @@ def fillna(self, value, subset=None):
return DataFrame(self._jdf.na().fill(value,
self._jseq(subset)), self.sql_ctx)
+ def cov(self, col1, col2):
+ """
+ Calculate the covariance for the given columns, specified by their
names.
+ alias for ``stat.cov()``.
+
+ :param col1: The name of the first column
+ :param col2: The name of the second column
+ :return: the covariance of the columns
--- End diff --
does ```:return:``` work in python doc? Can you try compiling it?
Also say something about the return type, maybe "covariance of the two
columns as a double value"
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