Github user keith-turner commented on the issue:
One option to consider instead of modifying RFile is to make it a decorator
like [BloomFilterLayer]. BloomFilterLayer stores its information in RFile
metadata. I'm think will be problems with this approach, but I would not know
what they are w/o actually trying it.
Are you considering making this a generic histogram functionality, where
the user can configure a function that emits counts for a given Key Value?
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