Jackie-Jiang commented on issue #4248: Alternative HyperLogLog implementation with higher accuracy URL: https://github.com/apache/incubator-pinot/issues/4248#issuecomment-496748846 @fx19880617 FASTHLL takes String type of serialized HyperLogLog objects, while DISTINCTCOUNTHLL can take BYTES (byte array) type of serialized HyperLogLog objects, which is more efficient in both storage and deserialization. The BYTES support for DISTINCTCOUNTHLL is new added after Pinot supporting BYTES data type.
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