{"record":{"id":"adf0b6eb93805c49","repo":"risingwavelabs/risingwave","slug":"cannot-find-field-type-for","errorCode":null,"errorMessage":"cannot find field type for {}","messagePattern":"cannot find field type for (.+?)","errorType":"validation","errorClass":"SinkError","httpStatus":null,"severity":"error","filePath":"src/connector/src/sink/deltalake.rs","lineNumber":452,"sourceCode":"            .fields()\n            .map(|f| (f.name(), f.data_type()))\n            .collect();\n        if deltalake_fields.len() != self.param.schema().fields().len() {\n            return Err(SinkError::DeltaLake(anyhow!(\n                \"Columns mismatch. RisingWave schema has {} fields, DeltaLake schema has {} fields\",\n                self.param.schema().fields().len(),\n                deltalake_fields.len()\n            )));\n        }\n        for field in self.param.schema().fields() {\n            if !deltalake_fields.contains_key(&field.name) {\n                return Err(SinkError::DeltaLake(anyhow!(\n                    \"column {} not found in deltalake table\",\n                    field.name\n                )));\n            }\n            let deltalake_field_type = deltalake_fields.get(&field.name).ok_or_else(|| {\n                SinkError::DeltaLake(anyhow!(\"cannot find field type for {}\", field.name))\n            })?;\n            if !check_field_type(&field.data_type, deltalake_field_type)? {\n                return Err(SinkError::DeltaLake(anyhow!(\n                    \"column '{}' type mismatch: deltalake type is {:?}, RisingWave type is {:?}\",\n                    field.name,\n                    deltalake_field_type,\n                    field.data_type\n                )));\n            }\n        }\n        if self.config.common.commit_checkpoint_interval == 0 {\n            return Err(SinkError::Config(anyhow!(\n                \"`commit_checkpoint_interval` must be greater than 0\"\n            )));\n        }\n        Ok(())\n    }\n","sourceCodeStart":434,"sourceCodeEnd":470,"githubUrl":"https://github.com/risingwavelabs/risingwave/blob/6469eb736d691e8e9b8a419a57edd6429ca77417/src/connector/src/sink/deltalake.rs#L434-L470","documentation":"Defensive lookup after the contains_key check: `deltalake_fields.get(&field.name)` is expected to succeed, and its absence is reported as 'cannot find field type for <name>'. In practice it is nearly unreachable because the presence check at line 446 runs first.","triggerScenarios":"Only reachable if the HashMap lookup fails despite the prior `contains_key` guard passing — essentially an invariant violation inside validate's field loop.","commonSituations":"Rarely hit by users; indicates an internal inconsistency in the validation code path rather than a user configuration problem.","solutions":["This is an internal invariant error; report it with the sink definition if seen","Re-run validation after confirming the earlier 'column not found' error was not masked","Upgrade RisingWave in case the duplicate-check code path was fixed"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"match sink_creation_result {\n    Err(e) if e.to_string().contains(\"cannot find field type for\") => {\n        report_internal_bug(e); // invariant violation, not user-fixable\n    }\n    Err(e) => handle_config_error(e),\n    Ok(_) => {}\n}","preventionTips":["If seen, file a bug with the full sink DDL — the code path is expected to be unreachable","Apply the fixes for errors 385/386 since those guards normally prevent this path"],"tags":["deltalake","internal","validation"],"backgroundTag":"internal-invariant-violation","analyzedSha":"6469eb736d691e8e9b8a419a57edd6429ca77417","analyzedAt":"2026-09-11T21:06:21.487Z","contentChangedAt":"2026-09-11T21:06:21.487Z","schemaVersion":2},"datasetVersion":"2026-09-14T16:17:12.679Z"}