FA-47810 / Delimited text / Member archive

A partial alias mapping is accepted as a complete schema · case 05

A structured table violates the declared record or column contract.

Member previewVariant 5 · 3 implementations · 10 checks per implementation

Case contract

Resolve comma header names through an alias map, then produce a permutation into required canonical columns. A header name may follow multiple alias hops; cycles reject. Reject two physical columns resolving to one canonical name, unknown names, or missing required names. Return physical indexes in required order.

Why this case matters

Delimited interchange needs explicit framing, schema and field semantics at ingestion and emission boundaries.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
missing	`[0]`	`null`	Failed

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