By the way, I built a [bloom filter aggregator](https://github.com/implydata/druid/compare/0.12.3-iap...clintropolis:0.12.3-iap-bloom) on top of this last weekend once I figured out `BloomKFilter` had a `merge` function. This way we can generate the bloom filters to feed into this directly from queries, which I'll submit in a PR once this gets merged. It's pretty similar to the cardinality agg. It's currently backported to a 0.12.3 branch of ours, and is missing tests, but it shouldn't be much to get it into master.
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