crepererum opened a new pull request, #10025:
URL: https://github.com/apache/arrow-datafusion/pull/10025

   ## Which issue does this PR close?
   Fixes #10015.
   
   ## Rationale for this change
   `RepartitionExec` is somewhat special. While most execs operate on "input 
partition = output partition", `RepartitionExec` drives all of its work using 
input-bound tasks. The metrics "fetch time" and "repartition time" therefore 
have to be accounted for the input partition, not for the output partition. The 
only metric that has an input & output partition label is the "send time".
   
   ## What changes are included in this PR?
   Metrics fixed.
   
   ## Are these changes tested?
   \-
   
   ## Are there any user-facing changes?
   Metrics make sense now.
   


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