FA-97939 / Dataset split isolation / Member archive

Dataset split: quota fill stops before an indivisible group that crosses the target · case 04

quota fill stops before an indivisible group that crosses the target.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Groups map to row lists and target is nonnegative; return ordered group IDs selected by size-descending then key, adding whole groups until cumulative size reaches target.

Why this case matters

This toy split allocator makes membership rules explicit for reproducible evaluation fixtures.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
overshoot whole group	`["b"]`	`["a"]`	Failed

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