wangyum commented on pull request #31193: URL: https://github.com/apache/spark/pull/31193#issuecomment-760809459
Generally speaking, aggregation can reduce the amount of data. Pushdown aggregation will move the aggregation after the join, which will cause to shuffle amount of data to join. If join can be broadcast, we'd better to do aggregation first to reduce the amount of shuffle data. ---------------------------------------------------------------- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
