FA-47575 / Delimited text / Member archive

A blank leaf is converted into a group-only column · case 05

A structured table violates the declared record or column contract.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Combine two tab-delimited header rows. Blank upper cells inherit the nearest upper label to their left; an initial blank upper label rejects. Lower labels never inherit and must be nonempty. Return unique dotted paths, preserving order. Widths must match.

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
empty leaf	`["group.a", "group.group"]`	`null`	Failed

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