primitives comparison results

Comparison results

Active contributors: Douwe de Vries

Purpose

Comparison results describe each aligned or unaligned row after a comparison. They drive summary counts, result table badges, exports, and snapshot persistence.

Key abstractions

Name	File	Description
RowComparisonResult	src/data/types.rs	Backend enum for match, mismatch, missing, unkeyed, and duplicate outcomes.
ResultType	src/data/types.rs	Serializable result kind.
ValueDifference	src/data/types.rs	Column-level mismatch details.
ComparisonSummary	src/data/types.rs	Aggregate result counts.
ResultResponse	src/presentation/responses.rs, frontend/src/types/api.ts	Public result shape consumed by the UI.
ResultRowViewModel	frontend/src/features/results/presentation.ts	Render-ready row state.

How it works

src/comparison/engine.rs emits RowComparisonResult values and calls generate_summary. src/presentation/responses.rs serializes them. frontend/src/features/results/presentation.ts adds labels, badges, search text, sort values, and expandable details.

Integration points

CSV export uses src/data/export.rs. HTML export uses frontend/src/features/results/htmlExport.ts. Snapshot persistence converts through src/backend/persistence/v1/mod.rs.

Key source files

File	Purpose
src/data/types.rs	Result enum and summary type.
src/comparison/engine.rs	Result generation.
src/presentation/responses.rs	Response conversion.
frontend/src/features/results/presentation.ts	UI view model.
frontend/src/components/ResultsTable.tsx	Rendered table.

See results review and export for the UI workflow.