AlexanderSaydakov commented on issue #7047: ingestion data with quantiles sketch module throw exception in 0.12.3 URL: https://github.com/apache/incubator-druid/issues/7047#issuecomment-462453317 Do I understand correctly that you are preparing data with sketches outside of Druid, this ingestion job expects sketches in some columns, and some of them can be nulls? The comparator of quantiles sketches in version 0.12.3 does not handle nulls. This was fixed at some point. You may want to upgrade to 0.13.0 Another way to fix this would be avoid nulls. Create empty sketches instead. By the way, I see that you are using approximate histogram as well. Please be aware that it has problems. I would suggest using quantiles sketch instead. See https://datasketches.github.io/docs/Quantiles/DruidApproxHistogramStudy.html
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