jon-wei commented on issue #7337: DataSketches HLL is not a replacement for Cardinality aggregator URL: https://github.com/apache/incubator-druid/issues/7337#issuecomment-478153854 For multidimension cardinality `byValue`, you could use a union of Theta sketches For multidimension cardinality `byRow`, you could construct a virtual column (http://druid.io/docs/latest/querying/virtual-columns.html) from the target input columns and feed that into the HLLSketch
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