FA-48115 / Delimited text / Member archive

Default filling silently discards unexpected source columns · case 05

A structured table violates the declared record or column contract.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Bind a two-column comma row to [a,b] with per-column defaults. An absent cell uses its default only if its required flag is false; a present empty cell stays empty. Surplus cells reject. Return ordered values. Defaults may be null or lists and must remain typed.

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
extra	`["a", "b"]`	`null`	Failed

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