Read path: serve persisted NDV statistics instead of Method-of-Moments when available.
- Loader mirroring PersistentSampleLoader::tryLoad: construct the deterministic _id, DBDirectClient::findOne on system.stats.ndv with no projection (keeps the query express-eligible)
- Only use persisted stats when eligible (feature flag + knob + single field only for now + no bounds passed)
- Clamp the served estimate to current collection cardinality (reuse the existing clamp)
- blocks
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SERVER-132802 Extend CE metrics for JOO to include HyperLogLog usage
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- In Code Review
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- related to
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- In Code Review
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SERVER-133669 Introduce a dedicated EstimationSource for estimates served from persisted NDV statistics
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- Needs Scheduling
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