34 lines
1.1 KiB
JSON
34 lines
1.1 KiB
JSON
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{
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"schemaVersion": 1,
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"generatedAt": "2026-07-21",
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"environment": {
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"platform": "darwin",
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"arch": "arm64",
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"cpu": "Apple M4 Pro",
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"postgres": "18.2 local Docker container"
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},
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"fixture": {
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"blobs": 1000000,
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"sampleSize": 100,
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"hashShape": "two concatenated MD5 hex digests",
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"middleSampleCount": 100,
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"wraparoundSampleCount": 100
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},
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"orderByRandom": {
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"samplesMs": [111.796, 103.906, 93.862, 88.090, 100.442],
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"medianMs": 100.442
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},
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"indexedHashRing": {
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"samplesMs": [0.474, 0.323, 0.376, 0.267, 0.491],
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"medianMs": 0.376
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},
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"speedup": 267.13,
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"statisticalReview": {
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"orderedHashFailureRangePercent": 1,
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"contiguousWindowDetectionProbabilityPercent": 1,
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"independentSamplesDetectionProbabilityPercent": 63.4,
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"reason": "A single random-pivot successor window is gap-biased and its 100 rows are correlated. It does not preserve ORDER BY random() detection power for localized or prefix/backend failures."
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},
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"decision": "rejected; production reverted despite 267.13x query speed because verification semantics regressed"
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}
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