kosiew commented on PR #21566:
URL: https://github.com/apache/datafusion/pull/21566#issuecomment-5327962999

   [Performance 
improvement](https://github.com/apache/datafusion/pull/21566#issuecomment-5327779490)
 under #21554 scenario (many files - the physical schema and other 
correctness-relevant inputs are the same):
   ```
   group                                            HEAD                        
           schema_caching-01-21554
   -----                                            ----                        
           -----------------------
   parquet_pruning_setup_cache/same_schema_files    1.07     12.3±0.13ms        
? ?/sec    1.00     11.5±0.23ms        ? ?/sec
   ```


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