{"record":{"id":"3336d9f4a815239b","repo":"apache/flink","slug":"type-information-for-input-of-type-is-not-suppo","errorCode":null,"errorMessage":"Type information for input of type {} is not supported. Could not generate a comparator.","messagePattern":"Type information for input of type (.+?) is not supported\\. Could not generate a comparator\\.","errorType":"exception","errorClass":"RuntimeException","httpStatus":null,"severity":"error","filePath":"flink-core/src/main/java/org/apache/flink/api/common/operators/base/OuterJoinOperatorBase.java","lineNumber":178,"sourceCode":"        return result;\n    }\n\n    @SuppressWarnings(\"unchecked\")\n    private <T> TypeComparator<T> buildComparatorFor(\n            int input, ExecutionConfig executionConfig, TypeInformation<T> typeInformation) {\n        TypeComparator<T> comparator;\n        if (typeInformation instanceof AtomicType) {\n            comparator = ((AtomicType<T>) typeInformation).createComparator(true, executionConfig);\n        } else if (typeInformation instanceof CompositeType) {\n            int[] keyPositions = getKeyColumns(input);\n            boolean[] orders = new boolean[keyPositions.length];\n            Arrays.fill(orders, true);\n\n            comparator =\n                    ((CompositeType<T>) typeInformation)\n                            .createComparator(keyPositions, orders, 0, executionConfig);\n        } else {\n            throw new RuntimeException(\n                    \"Type information for input of type \"\n                            + typeInformation.getClass().getCanonicalName()\n                            + \" is not supported. Could not generate a comparator.\");\n        }\n        return comparator;\n    }\n\n    private static class OuterJoinListIterator<IN1, IN2> {\n\n        private static enum MatchStatus {\n            NONE_REMAINED,\n            FIRST_REMAINED,\n            SECOND_REMAINED,\n            FIRST_EMPTY,\n            SECOND_EMPTY\n        }\n\n        private OuterJoinType outerJoinType;","sourceCodeStart":160,"sourceCodeEnd":196,"githubUrl":"https://github.com/apache/flink/blob/2f3c205e9266cb30240eb7f4fdab15cad629a70f/flink-core/src/main/java/org/apache/flink/api/common/operators/base/OuterJoinOperatorBase.java#L160-L196","documentation":"Error \"Type information for input of type {} is not supported. Could not generate a comparator.\" thrown in apache/flink.","triggerScenarios":"Triggered at runtime when the operation fails because: Type information for input of type the reported value is not supported. Could not generate a comparator.","commonSituations":"Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Type information for input of type the reported value is not supported. Could not generate a comparator.","solutions":["Address the cause reported by the error message: Type information for input of type the reported value is not supported. Could not generate a comparator.","Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry."],"exampleFix":"Correct the condition described (\"Type information for input of type the reported value is not supported. Could not generate a comparator.\") and rerun the job or command.","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2f3c205e9266cb30240eb7f4fdab15cad629a70f","analyzedAt":"2026-08-14T08:48:24.518Z","schemaVersion":2},"datasetVersion":"2026-08-14T10:17:34.591Z"}