mzabaluev commented on PR #9700:
URL: https://github.com/apache/arrow-rs/pull/9700#issuecomment-4264942406

   For delta-based encodings there is this language in the specification:
   
   > Writers must not use more bits when bit packing the miniblock data than 
would be required to PLAIN encode the physical type (e.g. INT32 data must not 
use more than 32 bits).
   
   So the estimate for the plain encoding should work as a pessimistic estimate 
for `DELTA_BINARY_PACKED` and `DELTA_LENGTH_BYTE_ARRAY`.


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