Github user koertkuipers commented on the pull request:
https://github.com/apache/spark/pull/2963#issuecomment-65828969
Hey @zsxwing,
In Scala Seq the order in which the values get processed in foldLeft is
well defined.
But can we make any assumptions at all about the ordering of the values if
you do not sort them in Spark? And if not, is foldLeft without sorting still
useful?
If so, i guess we can make the sorting optional. Or rename this function to
make it clear it sorts.
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