FA-47938 / Delimited text / Member archive

A reversed column range is normalized instead of rejected · case 03

A structured table violates the declared record or column contract.

Member previewVariant 3 · 3 implementations · 11 checks per implementation

Case contract

Resolve an ordered comma column selector against width. Decimal selectors are one based, ranges a-b include both endpoints, and * adds every column not selected earlier. Explicit duplicate selections are retained. Reject malformed, reversed or out-of-bound numeric ranges. Return zero-based physical indexes.

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
reversed	`[0, 1, 2]`	`null`	Failed

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