fallintoplace opened a new pull request, #1350:
URL: https://github.com/apache/arrow-go/pull/1350

   **What**
   - Add AVX2 and NEON fast paths for Int8 and Uint8 filters.
   
   **Why**
   - Reduce per-value work for large mixed masks.
   
   **Implementation**
   - Keep the existing path for nulls, short inputs, unaligned bitmaps, and 
uniform masks.
   - Add offset and bitmap edge cases plus 1K/64K/1M benchmarks.
   - On an M1 Pro, 1M mixed masks are 2.7–3.6x faster; alternating masks are 
22–24x faster.
   


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