cwang9208 commented on PR #36552: URL: https://github.com/apache/spark/pull/36552#issuecomment-1194958558
Hi Yuming, according to the paper Eager Aggregation and Lazy Aggregation ([pdf](https://www.vldb.org/conf/1995/P345.PDF)), there are several approaches for partial pre-aggregation, including eager group-by, eager count, and double eager (see Figure 2). Which one are you implementing? I guess CBO should iterate these alternatives and make a decision, right? -- 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]
