wiedld opened a new pull request, #7799: URL: https://github.com/apache/arrow-datafusion/pull/7799
## Which issue does this PR close? Prerequisite for the cascading merge. Part of #7181 . ## Rationale for this change Create a new merge submodule which has the SortPreservingMergeStream (a.k.a. the loser tree). The SortPreservingMergeStream will be [used repeatedly](https://github.com/apache/arrow-datafusion/blob/9b1019853fb3d71f6355ab1d850089332592b3d8/datafusion/physical-plan/src/sorts/cascade.rs#L43-L75) as part of the cascading merge tree. By comparison, the streaming_merge() method will only be called once -- by the cascading struct (in the cascade submodule). ## What changes are included in this PR? See above. ## Are these changes tested? Only moving code. Nothing change. ## Are there any user-facing changes? No. -- 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]
