gianm commented on issue #6814: [Discuss] Replacing hyperUnique as 'default' distinct count sketch URL: https://github.com/apache/incubator-druid/issues/6814#issuecomment-454426617 @leerho You can also check the following files to see how HyperLogLogCollector gets used (all the meaningful usages should be in them): - CardinalityAggregatorFactory - HyperUniquesAggregatorFactory - CardinalityBufferAggregator - HyperUniquesBufferAggregator - HyperUniquesSerde - PreComputedHyperUniquesSerde Seems to be `estimateCardinality`, `add(byte[])`, `fold(ByteBuffer)`, `fold(HyperLogLogCollector)`, `compareTo`, `toByteArray`, and `toByteBuffer`.
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