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List concatenation repeats each batch initial offset sentinel · case 04

List concatenation repeats each batch initial offset sentinel.

Member previewVariant 4 · 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
two batches	`[[0, 0, 2, 2, 3], [4, 5, 6], [true, true]]`	`[[0, 2, 3], [4, 5, 6], [true, true]]`	Failed

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