Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/3913#issuecomment-93487382
Again, one of the main uses is estimating the size of variables you're
considering broadcasting. Another is experimenting with different
representations - e.g. how much more efficient is declaring a custom class than
just using a hash map? In these situations, putting the data into and RDD to
estimate the size would be an inconvenience.
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