mapleFU commented on PR #15241:
URL: https://github.com/apache/arrow/pull/15241#issuecomment-1375018586

   Sorry for being crazy and at you for multiple times. I finally make clear 
the meaning of them, and put the meaning in `encoding_test.cc`:
   
   ```
     // Both good_data and bad_data is a DELTA_BINARY_PACKED INT32 Page with 65 
values.
     // For needed miniblocks, there bit-widths are all 32.
     // There bit-widths for unneeded miniblocks are different:
     // * good_data's unneeded bit-width is 0.
     // * bad_data's unneeded bit-width is 165.
   ```


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