Rich-T-kid opened a new issue, #11060:
URL: https://github.com/apache/arrow-rs/issues/11060
When filtering arrays with a null bitmap, the current implementation walks
the bitmap one bit at a time, one byte load and branch per row. For
mid-selectivity filters (~50% kept) this loop dominates `filter_bits`. we
should replace it with a word-level approach that reduces the null bitmap pass
from `O(selected_count)` byte loads to `O(filter_len/64)` u64 loads.
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