{"record":{"id":"821f3799969dffad","repo":"pola-rs/polars","slug":"failed-to-write-the-schema-into-the-file","errorCode":null,"errorMessage":"failed to write the schema into the file","messagePattern":"failed to write the schema into the file","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/polars-plan/src/bin/dsl-schema.rs","lineNumber":88,"sourceCode":"\n    /// Serializes the current DSL schema into a file at the given path.\n    ///\n    /// Any existing file at the path is overwritten.\n    fn generate(path: impl AsRef<Path>) {\n        let schema = DslPlan::dsl_schema();\n\n        let mut file = File::create(path).expect(\"failed to open the schema file for writing\");\n        serde_json::to_writer_pretty(&mut file, &schema).expect(\"failed to serialize the schema\");\n        writeln!(&mut file).expect(\"failed to write the last newline\");\n        file.flush().expect(\"failed to flush the schema file\");\n    }\n\n    /// Outputs the current DSL schema hashes into a file at the given path.\n    ///\n    /// Any existing file at the path is overwritten.\n    fn update_hashes(path: impl AsRef<Path>) {\n        std::fs::write(path, current_schema_hashes())\n            .expect(\"failed to write the schema into the file\");\n        eprintln!(\"the DSL schema file was updated\");\n    }\n\n    /// Checks that the current schema hashes match the schema hashes in the file.\n    fn check_hashes(path: impl AsRef<Path>) {\n        let file_hashes =\n            std::fs::read_to_string(path).expect(\"failed to read the schema hashes from the file\");\n        let expected = current_schema_hashes();\n        if file_hashes != expected {\n            eprintln!(\"the schema hashes are not up to date, run `make update-dsl-schema-hashes`\");\n\n            eprintln!(\"expected schema hashes:\");\n            eprintln!(\"{}\", expected);\n\n            std::process::exit(1);\n        }\n        eprintln!(\"the DSL schema hashes are up to date\");\n    }","sourceCodeStart":70,"sourceCodeEnd":106,"githubUrl":"https://github.com/pola-rs/polars/blob/9b5d73fd00236295624374b075d16b1fe6ec6df9/crates/polars-plan/src/bin/dsl-schema.rs#L70-L106","documentation":"Panic in dsl-schema's generate step when serde_json fails to write the serialized schema into the output file (serialization of the DSL schema failed). Indicates an internal schema-generation problem rather than bad CLI usage.","triggerScenarios":"This panic/expect fires when execution reaches an unguarded state described by: \"failed to write the schema into the file\". Typical triggers: unsupported dtype or feature-gated code path reached at runtime, invalid user input or environment variable value, calling API methods in the wrong order or on mismatched types, or data (lengths, offsets, ranges) violating the function's preconditions.","commonSituations":"Encountered when input data or configuration does not meet the preconditions of the throwing code path (\"failed to write the schema into the file\"). Common cases: missing Cargo feature flags, mismatched dtypes/lengths between arrays or series, out-of-range temporal values, malformed environment variables, or operations on unsupported/complex nested types.","solutions":["Check write permissions and available disk space for the schema file path.","Verify the target directory exists before running the tool."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"9b5d73fd00236295624374b075d16b1fe6ec6df9","analyzedAt":"2026-08-19T12:15:06.350Z","contentChangedAt":"2026-08-19T12:15:06.350Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}