orneryd / NornicDB / 37166764109

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push

github

Committed by orneryd

Commit Message

fix(storage): async label counts from the stored counters (#843)

AsyncEngine.NodeCountByLabel and NodeCountByLabelInNamespace loaded every
node of the label to count it, so MATCH (n:Label) RETURN count(n) and the
coverage check behind label-less property lookups cost a full read of the
label on a server (128 ms at 40k nodes; Neo4j 3 ms).

They now take the inner engine's per-label count and adjust it by the
cached writes: a cached node counts +1 when it has the label and -1 when
its stored version has it, a cached delete -1 when the stored node has
it. flushMu keeps a flush from moving writes between the cache and the
store meanwhile, as NodeCount does. Inner engines without label counts
keep the label scan.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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