AlexanderSaydakov commented on issue #7297: thetaSketch aggrgator handle null or "" into unexpected value at ingesting URL: https://github.com/apache/incubator-druid/issues/7297#issuecomment-474555914 I would recommend using HLL if you don't need intersections and A-not-B operations, and can tolerate slower merge (space is more important for you).
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