Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/9504#discussion_r44075748
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -590,6 +633,29 @@ def join(self, other, on=None, how=None):
return DataFrame(jdf, self.sql_ctx)
@ignore_unicode_prefix
+ @since(1.6)
+ def sortWithinPartitions(self, *cols, **kwargs):
+ """Returns a new :class:`DataFrame` with each partition sorted by
the specified column(s).
+
+ :param cols: list of :class:`Column` or column names to sort by.
+ :param ascending: boolean or list of boolean (default True).
+ Sort ascending vs. descending. Specify list for multiple sort
orders.
+ If a list is specified, length of the list must equal length
of the `cols`.
+
+ >>> df.rdd.getNumPartitions()
+ 4
--- End diff --
This may be determined by the number of CPU that the host have, is not
stable.
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