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Having DataSketches jars in core will allow potential improvements, for example: - Provide an alternative implementation of HLL: https://datasketches.github.io/docs/HLL/HllSketchVsDruidHyperLogLogCollector.html - Range partitioning for native parallel batch indexing without having the user load extensions on the classpath Dev mailing list discussion: https://lists.apache.org/thread.html/301410d71ff799cf616bf17c4ebcf9999fc30829f5fa62909f403e6c%40%3Cdev.druid.apache.org%3E