a2l007 commented on issue #7741: Indexing tasks containing thetaSketches results in incorrect sketch values URL: https://github.com/apache/incubator-druid/issues/7741#issuecomment-523645026 @leventov The issue is that when sketches are empty, the AggregateCombiner.reset() within `SketchAggregatorFactory` does not clear out the combined union object. As a result, this would have the combined value from a previous merge and this stale value would be used as the combined value for the present set of rows. I'm raising a PR shortly for fixing this.
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