Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/9655#issuecomment-156083460
`fold` is not semantically the same as `foldLeft`. They have different
signatures. `foldLeft` implies the order of the fold matters, and it mostly
does not. Therefore writing it that way is less clear IMHO. I would not make
this change.
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