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UNIQ_FOLD_CHOSEN

spg_engine

Static UNIQ_FOLD_CHOSEN 

Source 
pub static UNIQ_FOLD_CHOSEN: AtomicU64
Expand description

r1018 — statements where [uc_probe_choice] declined the btree and took the per-statement fold instead. Without this the two paths are indistinguishable from the outside, and a regression that silently put the unselective probe back would read as a slowdown with no cause attached.