sascha-coenen commented on issue #9321: Performance degradation in topN queries when SQL-compatible null handling is enabled URL: https://github.com/apache/druid/issues/9321#issuecomment-591252082 Hi, thanks for the pointer. sjk looks like a supernice tool. really easy to use. I attached a zip archive with the "before and after" flamegraph reports. I'm not an expert at reading flamegraphs, but to me the biggest difference seems to be the org.apache.druid.query.aggregation.NullableNumericBufferAggregator.aggegate method. [flamegraphs.zip](https://github.com/apache/druid/files/4253564/flamegraphs.zip)
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