pub const ARROW_ROW_CHUNK: usize = 256;Expand description
Deterministic row-block tiling constant for the parallel reduction paths.
All cross-row summations chunk the rows into ARROW_ROW_CHUNK-sized tiles
and reduce the per-tile partials in tile-index order on the caller thread,
so the floating-point reduction tree is fixed across Rayon worker counts and
work-stealing decisions. Consumers that require deterministic associativity
must keep their tiling a multiple of this constant.