{"record":{"id":"4918668832f5eb99","repo":"apache/flink","slug":"outer-join-of-type-not-supported","errorCode":null,"errorMessage":"Outer join of type '{}' not supported.","messagePattern":"Outer join of type '(.+?)' not supported\\.","errorType":"exception","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"flink-core/src/main/java/org/apache/flink/api/common/operators/base/OuterJoinOperatorBase.java","lineNumber":302,"sourceCode":"                    currLeftIterator = new ListIteratorWrapper(currLeftSubset.iterator());\n                    if (currLeftIterator.next() != null) {\n                        leftContainsElements = true;\n                    }\n                    currLeftIterator.reset();\n                }\n                return leftContainsElements;\n            } else if (outerJoinType == OuterJoinType.RIGHT) {\n                boolean rightContainsElements = false;\n                while (!rightContainsElements && nextGroups()) {\n                    currRightIterator = new ListIteratorWrapper(currRightSubset.iterator());\n                    if (currRightIterator.next() != null) {\n                        rightContainsElements = true;\n                    }\n                    currRightIterator.reset();\n                }\n                return rightContainsElements;\n            } else {\n                throw new IllegalArgumentException(\n                        \"Outer join of type '\" + outerJoinType + \"' not supported.\");\n            }\n        }\n\n        private boolean nextGroups() throws IOException {\n            boolean firstEmpty = true;\n            boolean secondEmpty = true;\n\n            if (this.matchStatus != MatchStatus.FIRST_EMPTY) {\n                if (this.matchStatus == MatchStatus.FIRST_REMAINED) {\n                    // comparator is still set correctly\n                    firstEmpty = false;\n                } else {\n                    if (this.leftGroupedIterator.nextKey()) {\n                        this.pairComparator.setReference(\n                                leftGroupedIterator.getValues().getCurrent());\n                        firstEmpty = false;\n                    }","sourceCodeStart":284,"sourceCodeEnd":320,"githubUrl":"https://github.com/apache/flink/blob/2f3c205e9266cb30240eb7f4fdab15cad629a70f/flink-core/src/main/java/org/apache/flink/api/common/operators/base/OuterJoinOperatorBase.java#L284-L320","documentation":"Error \"Outer join of type '{}' not supported.\" thrown in apache/flink.","triggerScenarios":"Triggered at runtime when the operation fails because: Outer join of type 'the reported value' not supported.","commonSituations":"Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Outer join of type 'the reported value' not supported.","solutions":["Address the cause reported by the error message: Outer join of type 'the reported value' not supported.","Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry."],"exampleFix":"Correct the condition described (\"Outer join of type 'the reported value' not supported.\") 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"}