JeonDaehong commented on PR #17774:
URL: https://github.com/apache/iceberg/pull/17774#issuecomment-5979630199

   Since you mentioned having some doubts about the math, I compared this PR 
against the old bit-at-a-time implementation from `main` in a throwaway test.
   
   * **Every single-bit input:** 1–10 columns, 1–16 bytes per input, and every 
possible output size. Since both implementations move each input bit to exactly 
one output bit, this covers the complete mapping space. **4,607,680 cases, 0 
differences.**
   * **Random and patterned bytes** (`0x00`, `0xFF`, `0x80`, etc.): 1–10 
columns, 1–17 bytes, every truncated output size, with a reused buffer 
pre-filled with garbage. **504,900 cases, 0 differences.**
   
   Hope this helps.


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