```json { "table_name": "columns_catalog", "primary_key": "id", "candidates": [ { "rank": 0, "partition_key": "id", "partition_key_label": "primary_identifier", "partition_key_reasoning": "RPUV=1.00 (perfectly unique), 1.5M distinct values, 100% uniqueness. This is the natural primary key for the dimension table, uniquely identifying each column metadata record.", "clustering_key": null, "clustering_key_label": null, "clustering_key_reasoning": "Dimension tables typically do not require internal sorting. No clustering key needed.", "world_line": null, "session_column": null, "confidence": "HIGH", "notes": "This is a metadata dimension table cataloging column definitions. The id column is the surrogate key. Alternative perspective by tables_catalog_id (RPUV=79.28) would group columns by their parent table, but that's a secondary access pattern, not a partitioning strategy for a dimension table." } ] } ```