FA-47715 / Delimited text / Member archive

Ditto expansion reads the first row forever · case 05

A structured table violates the declared record or column contract.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Read semicolon rows in a schema where bare ^ copies the previous value in that column, ^^ represents literal ^, and ^! resets that column to null. A copy in the first row rejects. Exactly two columns are required; an explicit empty string replaces the previous value.

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
copy columns	`[["cellcellcellcellcell", "a"], ["cellcellcellcellcell", "b"], ["c", "a"]]`	`[["cellcellcellcellcell", "a"], ["cellcellcellcellcell", "b"], ["c", "b"]]`	Failed

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