WilliamWhispell commented on issue #8171: Slow double dimension query when useDefaultValueForNull set to false URL: https://github.com/apache/incubator-druid/issues/8171#issuecomment-516044350 Looks like all the time is spent inside the IsNull check of HistoricalDoubleColumnSelectorWithNulls. All of the time is spent in BitIterator.skipAllBefore which is called inside of ImmutableConciseSet.contains. I'm not sure why the other non-double fields don't see this performance issue.
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