xudong963 commented on issue #19724: URL: https://github.com/apache/datafusion/issues/19724#issuecomment-3877254521
I think the proposal is more advanced than the issue https://github.com/apache/datafusion/issues/15191. The previous discussion is doing things like: 1. Reorganize the file groups to make sure that each group files are ordered 2. To check if there is no overlap between partitions(file groups) 3. Leverage the ProgressiveEval to optimize SortPreservingMergeExec to avoid merging non-overlapping partitions IIUC, the issue is proposing to re-arrange files across file groups, then resplit the files into file groups with the ordering. I have some issues: a) If files are overlapped aggressively, how to process? b) The decrease in parallelism is something that needs careful consideration, since query requests are quite diverse, not only topk. -- 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]
