{"record":{"id":"17527e6482a66699","repo":"dbt-labs/dbt-core","slug":"cast-method-not-implemented-for-the-data-type","errorCode":null,"errorMessage":"cast() method not implemented for the {} data type","messagePattern":"cast\\(\\) method not implemented for the (.+?) data type","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/dbt-agate/src/data_type.rs","lineNumber":69,"sourceCode":"pub trait DataTypeRepr: fmt::Debug + Send + Sync {\n    /// A sequence of values which should be cast to [None] when encountered by this data type.\n    fn null_values(&self) -> &NullValues<'static>;\n\n    /// The name of the [DataType] implementation.\n    fn type_name(&self) -> &str;\n\n    /// Test, for purposes of type inference, if a value could possibly be\n    /// coerced to this data type.\n    ///\n    /// This is really just a thin wrapper around :meth:`DataType.cast`.\n    fn test(&self, d: &dyn DataTypeRepr) -> bool {\n        self.cast(d).is_ok()\n    }\n\n    /// Coerce a given string value into this column's data type.\n    fn cast(&self, d: &dyn DataTypeRepr) -> Result<Value, Error> {\n        // raise NotImplementedError\n        let err = Error::new(\n            ErrorKind::InvalidOperation,\n            format!(\n                \"cast() method not implemented for the {} data type\",\n                d.type_name()\n            ),\n        );\n        Err(err)\n    }\n\n    /// Format a given native value for CSV serialization.\n    fn csvify(&self, d: &Value) -> Value {\n        if d.is_none() || d.is_undefined() {\n            Value::from(())\n        } else {\n            Value::from(d.to_string())\n        }\n    }\n","sourceCodeStart":51,"sourceCodeEnd":87,"githubUrl":"https://github.com/dbt-labs/dbt-core/blob/0267ce9170576975b76b64ce856b2e5848e96617/crates/dbt-agate/src/data_type.rs#L51-L87","documentation":"This DataTypeRepr implementation leaves cast() unimplemented, so any cast attempt — directly or via test(), which just wraps cast().is_ok() — fails for this data type. It marks type coercions the agate port has not yet provided.","triggerScenarios":"Thrown at crates/dbt-agate/src/data_type.rs:69 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Implement cast for this data type, or route the coercion through the string representation as a fallback","Return a distinguishable Err so callers can treat it as 'cannot cast' rather than a crash","Register a text-mediated fallback cast for unimplemented types"],"exampleFix":null,"handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"0267ce9170576975b76b64ce856b2e5848e96617","analyzedAt":"2026-09-07T21:53:39.732Z","contentChangedAt":"2026-09-07T21:53:39.732Z","schemaVersion":2},"datasetVersion":"2026-09-17T15:17:12.973Z"}