## MODIFIED Requirements

### Requirement: Document DuckDB convenience helper functions
All DuckDB convenience helper functions SHALL be documented with clear usage examples.

#### Scenario: DuckDB helper function documentation
- **WHEN** a user searches for DuckDB merge functionality
- **THEN** documentation SHALL include `DuckDBDatasetIO.merge`, `collect_dataset_stats_duckdb`, and `compact_parquet_dataset_duckdb`
- **AND** each function SHALL have clear parameter documentation
- **AND** each function SHALL include practical usage examples
- **AND** each function SHALL document key column requirements


