{"id":"dynamodb-contains-filter-only-not-key-condition","text":"The `contains` function is available only in DynamoDB filter expressions, not in key condition expressions; `begins_with` is available in both.","truth_value":"IN","source":"entries/2026/03/11/amazondynamodb-latest-developerguide-QueryKeyConditionExpressionshtml.md","source_url":"","source_hash":"4120980cc853ce07","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"dynamodb-contains-filter-only-not-key-condition","truth_value":"IN","reason":"premise"}]}}