Rich-T-kid commented on PR #25185:
URL: https://github.com/apache/datafusion/pull/25185#issuecomment-5635962382

   there is no perf difference entirely due to how the benchmarks are set up. 
in the benchmarks the values array are created fresh for each `intern()` call. 
in practice this isnt what happens, dictionary array values typically map to 
one parquet row-group which can be very large. 
   
   if maintainers are interested in seeing what the performance gains this 
would mean for parquet files we may need to wait for 
https://github.com/apache/datafusion/pull/24227 to be over the finish line so 
we can run @adriangbot with the flag enabled.
   


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