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A malformed UDF batch returns an empty success instead of an error · case 05

A malformed UDF batch returns an empty success instead of an error.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Execute a stipulated vector UDF result contract. For every selected batch, output length must equal selected input length, and output validity must have the same length. A malformed batch emits LENGTH_ERROR and no partial values. Valid output values use their own validity and retain selected input identities.

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
short result	`[[]]`	`["LENGTH_ERROR"]`	Failed

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