kou commented on issue #41964:
URL: https://github.com/apache/arrow/issues/41964#issuecomment-2151320885

   `mamba clean --all -y` before `mamba create ...` solves this: 
https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/49963459
   
   AppVeyor may have invalid cache for mamba. Should we clean caches 
explicitly? Or should invalid cache be cleaned automatically?


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