FA-14282 / Numerical aggregation / Member archive

Three row count sketch: Identical weighted events are deduplicated within a block. · case 02

The reduction disagrees with its explicit aggregation oracle.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

A stipulated nonnegative weighted count-min table has exactly three independent rows of positive width, with bucket functions k%w,(3*k+1)%w,(k//w)%w for nonnegative integer keys. Add all block contributions, then estimate each query by the minimum of its three cells. Return [table,estimates]; no probabilistic error guarantee is claimed.

Why this case matters

Exact bounded examples isolate a reduction defect without floating-point or external-service effects.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression 4	`[[[1], [1], [1]], [1, 1]]`	`[[[2], [2], [2]], [2, 2]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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