FA-47950 / Delimited text / Member archive

Duplicate-header suffix numbering starts at one · case 05

A structured table violates the declared record or column contract.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Assign unique output names to repeated raw column names. First occurrence keeps its name; later duplicates append _2, _3, etc, skipping names already present anywhere in the raw header and names already assigned. Empty raw names use column<one-based-position> before collision handling. Preserve 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
duplicates	`["cellcellcellcellcell", "cellcellcellcellcell_1", "cellcellcellcellcell_2"]`	`["cellcellcellcellcell", "cellcellcellcellcell_2", "cellcellcellcellcell_3"]`	Failed

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