zhuqi-lucas opened a new pull request, #18245:
URL: https://github.com/apache/datafusion/pull/18245

   ## Which issue does this PR close?
   
   - Closes [#18244](https://github.com/apache/datafusion/issues/18244)
   
   ## Rationale for this change
   
   In our internal project, the limit will not return right number when 
CoalescePartitionsExec follow up by our customer operator which is only one 
partition output.
   
   After my investigation i found:
   
   CoalescePartitionsExec fetch is not consistent with one partition and more 
than one partition.
   
   ## What changes are included in this PR?
   
   Make CoalescePartitionsExec fetch should be consistent when the partition 
number changes.
   
   ## Are these changes tested?
   
   Yes
   ## Are there any user-facing changes?
   
   No


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