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Avoid redundant filtering in FilteredMap.size() - #37256
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Sep 14, 2026
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Since keySet() already applies the filter, size() evaluated the predicate twice for every accepted key. This commit uses delegate.keySet() instead, avoiding the second evaluation as well as a FilteredSet and FilteredIterator allocation. Signed-off-by: Hyunwoo Jung <hyunwoojung@kakao.com>
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Fixed via 9d1156f |
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FilteredMap.size()iterates overkeySet(), which already applies the predicate through aFilteredSetwrapper.The loop then tests each accepted key a second time.
This PR updates
FilteredMap.size()to iterate overdelegate.keySet()instead, avoiding redundant evaluations and the creation of aFilteredSetwrapper on every call.