BlakeOrth commented on PR #17266:
URL: https://github.com/apache/datafusion/pull/17266#issuecomment-3267718285

   > Its also cool to see that it works on the local object store, but the 
output appears duplicated:
   
   @nuno-faria thanks for giving this a test run! Looking at this output I 
initially thought you were correct that it was duplicated, but on closer 
inspection the duration of the operations is different between the first and 
the 2nd case. This leads me to believe the object_store operations may actually 
get executed twice for some reason. Generating the text output currently 
leverages a `drain` iterator behind a mutex on the underlying data, so getting 
any duplication seems unlikely (although if someone can identify how this might 
be possible that would be an excellent find). Perhaps we've just uncovered some 
curious behavior in DataFusion?


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