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Jonathan Shook
085e545787
A filtered ground truth pads a query whose predicate matches fewer than k rows with sentinels no search can return, and the strict recall divides by k regardless, so a small slice reads low by construction. attainable_recall leaves the sentinels out of the denominator: the share of the neighbors that exist which were found. A row with nothing attainable scores 1.0; how many such rows there are is a fact about the ground truth, not the search.