Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3795#issuecomment-68116658
@aarondav Good idea, I'll make that change.
Note that we can't do a similar fix for arrays: many PairRDDFunctions
methods rely on being able to use keys to index into hashmaps, and that will
involve the arrays' Object.hashCode. Therefore, we should probably strengthen
the warnings for array into errors, since there's a high likelihood that users
will get incorrect results.
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