ccaominh commented on issue #9168: "assumeGrouped" behaves differently in native batch and hadoop tasks URL: https://github.com/apache/druid/issues/9168#issuecomment-576847712 When `assumeGrouped` is `true`, range partitioning for native batch does not have to hash dimension values for bloom filter inserts/tests. There's also some reduction in memory usage as the bloom filter does not need to be created. Both of these should help `PartialDimensionDistributionTask` run slightly faster than when `assumeGrouped` is `false`.
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