Github user udoklein commented on the pull request:
https://github.com/apache/spark/pull/10640#issuecomment-169799202
Good point. The documentation did not mention the keyfunc. However it is
somewhat pointless to add the default as an argument. In particular if the
default is lambda x: x. Conclusion: the documentation should be fixed instead.
(http://spark.apache.org/docs/latest/programming-guide.html) Where would I find
the sources for the programming guide?
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