mingmwang commented on issue #4169:
URL: 
https://github.com/apache/arrow-datafusion/issues/4169#issuecomment-1311388859

   One question for SortPreservingMergeExec, does it alway require the inputs 
to be sorted ? What if the inputs are not sorted,
   what kind of output stream the SortPreservingMergeExec can generate ?


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