FA-47744 / Delimited text / Member archive

A ragged delimiter candidate defeats a stable dialect · case 04

A structured table violates the declared record or column contract.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Choose comma, tab, or semicolon from precomputed per-record field counts. Ignore blank physical records marked null. A candidate must have >=2 fields on every sampled record and constant width. Score is record count times width; greatest score wins, ties use candidate order. No valid candidate returns null.

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
ragged distractor	`"comma"`	`"tab"`	Failed

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