pitrou opened a new issue, #46994:
URL: https://github.com/apache/arrow/issues/46994

   ### Describe the enhancement requested
   
   At least for dictionary encoding, it should be trivial to reuse the same 
view for all occurrences of a given dictionary value.
   
   For DELTA_BYTE_ARRAY, this should also be possible if the prefix length is 
the full length of the previous value, and the suffix length is 0 (this is an 
efficient way of detecting repeated values).
   
   For other encodings, it would probably be too expensive, though, as full 
length string comparisons would be required.
   
   
   ### Component(s)
   
   C++, Parquet


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