quenlang opened a new issue #7297: thetaSketch aggrgator handle null or "" into unexpected value at ingesting URL: https://github.com/apache/incubator-druid/issues/7297 @AlexanderSaydakov @gianm I had found the thetaSketch aggrgator handle ```null``` or ```""``` into unexpected value at ingesting in our scene but i'm not sure why it happend. I defined a thetaSketch aggrgator in our metrics like this ``` { "name": "prefix_success_business_no", "fieldName": "prefix_success_business_no", "type": "thetaSketch" } ``` The value of prefix_success_business_no column in raw data before ingesting maybe `null`, `empty string` or `normal string` which like "quenl...@126.com". we found that even though the prefix_success_business_no's value is null or "" or combination of the two in raw data, then after ingesting, the distinct count of prefix_success_business_no was not null or zero when i performed a thetaSketch aggrgator query like this ``` ... { "type": "thetaSketch", "name": "prefixSuccessBusinessNo", "fieldName": "prefix_success_business_no", "size": 16384, "shouldFinalize": true, "isInputThetaSketch": false, "errorBoundsStdDev": null } ... ``` the result like this ``` [ { "timestamp" : "2019-03-18T13:30:00.000Z", "result" : { "prefixSuccessBusiness_no" : 16.0 } } ] ``` All the orignal value of prefix_success_business_no is null in this query, but druid return the distinct count of prefix_success_business_no 16 for me. I had no ideas about this situation, does the thetaSkect not handle null or "" fully? my druid version was 0.13.0. There was a new aggrgator in 0.13.0 which called HLLSkecth, can you tell me more about the difference between HLLSkecth and thetaSkect over space, speed and accuracy? which one i should use in my sense. Best wishes !
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