lgbo-ustc commented on issue #7647: URL: https://github.com/apache/incubator-gluten/issues/7647#issuecomment-2430683858
Need to consider two cases - The grouping keys are all low cardinality. There is no doubt that it can reduce the cost of the first partial aggregation. - Some of the grouping keys are high cardinality. This could reduce the cost of the first partital aggregation, but may increaes the cost of shuffle. -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
