```json { "table_name": "products", "primary_key": "product", "candidates": [ { "rank": 0, "partition_key": "product", "partition_key_label": "primary_identifier", "partition_key_reasoning": "product is the unique identifier with RPUV=1.00, uniqueness=1.000, and 7 distinct values. Each product name is unique and serves as the natural primary key for this dimension table.", "clustering_key": null, "clustering_key_label": null, "clustering_key_reasoning": "Dimension tables typically do not require clustering keys. With only 7 rows, no internal sorting is needed.", "world_line": null, "session_column": null, "confidence": "HIGH", "notes": "Classic dimension table with 7 product records. The product column is the natural primary identifier. The series column groups products into families (GTX, MG, GTK) but is not suitable as a partition key due to low cardinality (RPUV=2.33, only 3 values). All metadata columns (_ingestion_timestamp, _batch_id, _source_file, _source_system) have RPUV=7.00, indicating they are constant across this batch and unsuitable for partitioning." } ] } ```