Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21383#discussion_r189938003
--- Diff: python/pyspark/rdd.py ---
@@ -1846,6 +1858,7 @@ def combineByKey(self, createCombiner, mergeValue,
mergeCombiners,
>>> sorted(x.combineByKey(to_list, append, extend).collect())
[('a', [1, 2]), ('b', [1])]
"""
+
--- End diff --
nit: unnecessary change
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