srowen commented on a change in pull request #33752:
URL: https://github.com/apache/spark/pull/33752#discussion_r692047369
##########
File path: python/pyspark/pandas/series.py
##########
@@ -944,6 +944,57 @@ def between(self, left: Any, right: Any, inclusive: bool =
True) -> "Series":
return lmask & rmask
+ def cov(self, other: "Series", min_periods: int = 1) -> float:
+ """
+ Compute covariance with Series, excluding missing values.
+ Parameters
+ ----------
+ other : Series
+ Series with which to compute the covariance.
+ min_periods : int, default 1
+ Minimum number of observations needed to have a valid result. None
= 1.
+
+ Returns
+ -------
+ float
+ Covariance between Series and other
+
+ Examples
+ --------
+ >>> from pyspark.pandas.config import set_option, reset_option
+ >>> set_option("compute.ops_on_diff_frames", True)
+ >>> s1 = ps.Series([0.90010907, 0.13484424, 0.62036035])
+ >>> s2 = ps.Series([0.12528585, 0.26962463, 0.51111198])
+ >>> s1.cov(s2)
+ -0.016857626527158744
+ >>> reset_option("compute.ops_on_diff_frames")
+ """
+
+ if min_periods is None:
+ min_periods = 1
+
+ if same_anchor(self, other):
+ self_column_label = verify_temp_column_name(other.to_frame(),
"__self_column__")
+ other_column_label = verify_temp_column_name(self.to_frame(),
"__other_column__")
+ combined = DataFrame(
+ self._internal.with_new_columns(
+ [self.rename(self_column_label),
other.rename(other_column_label)]
+ )
+ )
Review comment:
count(), it depends. In some cases it doesn't touch the data at all
(just uses count metadata), in some cases it has to read everything to count
it. head() has to pull data to the driver, but, just a little bit.
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