AlexanderSaydakov commented on issue #7940: Find exception when use thetaSketch INTERSECT topN Query type with Broker result level Cache URL: https://github.com/apache/incubator-druid/issues/7940#issuecomment-506023866 I believe your problem is caused by your aggregation parameter "shouldFinalize":true. This means that the result of the aggregation is not a sketch, but a distinct count estimate obtained from the sketch. So you are trying to intersect two double values instead of two sketches. Just remove that parameter from both aggregations and try again.
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