Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2091#issuecomment-53305144
Why do we even need `evenBuckets`? Can't we just check whether the buckets
are evenly-spaced and automatically perform the optimization if they are? This
only requires a linear scan through the buckets array. I suppose that we could
run into problems if the buckets are evenly-spaced but small rounding /
precision errors cause us to mark the buckets as non-even.
/cc @holdenk who implemented the `DoublePairRDDFunctions.histogram()`
function.
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