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List concatenation copies unused child-buffer prefixes · case 02

List concatenation copies unused child-buffer prefixes.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Concatenate offset-based list batches into one compact child buffer. Rebase every row offset, copy only each batch referenced child span, preserve parent validity, and preserve child nulls. Output [offsets,visible-child,parent-validity].

Why this case matters

A bounded deterministic data engine model makes representation and changelog faults reproducible.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
sliced child	`[[0, 3], [0, 2, 3], [true]]`	`[[0, 2], [2, 3], [true]]`	Failed

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