himanshug commented on issue #8071: add aggregators for computing mean/average URL: https://github.com/apache/incubator-druid/issues/8071#issuecomment-513954218 yeah that algorithm is to avoid overflowing `sum` . You are right that instructions for divisions are slower in theory (but hardware has come a long way...), but I will benchmark the division based algo presented here and post the findings. That said, for some users it might be important to not have overflow problem even if division in this algorithm can potentially make things slower and Using sum, count aggs with a post agg for division would still be available. That said, I think main reason for introducing a mean aggregator is for convenience of its usage in druid native query spec which is what currently being used in my project. (Actually real story is slightly more complicated :P ) .
---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
