{"record":{"id":"d88346ae7f8b5823","repo":"apache/seatunnel","slug":"the-data-does-not-match-the-configured-schema-info","errorCode":null,"errorMessage":"The data does not match the configured schema information, please check","messagePattern":"The data does not match the configured schema information, please check","errorType":"exception","errorClass":"IndexOutOfBoundsException","httpStatus":null,"severity":"error","filePath":"seatunnel-formats/seatunnel-format-csv/src/main/java/org/apache/seatunnel/format/csv/CsvSerializationSchema.java","lineNumber":176,"sourceCode":"\n        public CsvSerializationSchema build() {\n            return new CsvSerializationSchema(\n                    seaTunnelRowType,\n                    separators,\n                    dateFormatter,\n                    dateTimeFormatter,\n                    timeFormatter,\n                    charset,\n                    nullValue,\n                    quoteMode,\n                    wallClockTimestampTz);\n        }\n    }\n\n    @Override\n    public byte[] serialize(SeaTunnelRow element) {\n        if (element.getFields().length != seaTunnelRowType.getTotalFields()) {\n            throw new IndexOutOfBoundsException(\n                    \"The data does not match the configured schema information, please check\");\n        }\n        Object[] fields = element.getFields();\n        String[] strings = new String[fields.length];\n        for (int i = 0; i < fields.length; i++) {\n            strings[i] = convert(fields[i], seaTunnelRowType.getFieldType(i), 0);\n        }\n        return String.join(separators[0], strings).getBytes(charset);\n    }\n\n    private String convert(Object field, SeaTunnelDataType<?> fieldType, int level) {\n        if (field == null) {\n            return nullValue;\n        }\n        switch (fieldType.getSqlType()) {\n            case DOUBLE:\n            case FLOAT:\n            case INT:","sourceCodeStart":158,"sourceCodeEnd":194,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-formats/seatunnel-format-csv/src/main/java/org/apache/seatunnel/format/csv/CsvSerializationSchema.java#L158-L194","documentation":"CsvSerializationSchema.serialize validates that the row's field count equals the configured SeaTunnelRowType's total fields; otherwise it throws IndexOutOfBoundsException telling the user the data does not match the schema. CSV writing is positional, so field count must match the declared columns exactly.","triggerScenarios":"Upstream source/transform emits a SeaTunnelRow with fewer or more fields than declared in the sink schema (schema drift, added/dropped columns, wrong catalog_table mapping).","commonSituations":"Adding a column to the source without updating the CSV sink schema; transform (e.g. SQL/FieldMapper) changing column count; schema evolution between source and sink.","solutions":["Align the sink schema (catalog table / schema option) with the actual row field count of the upstream data.","Insert a transform to add missing columns with defaults or drop extra columns before the CSV sink.","Log/inspect one upstream SeaTunnelRow (fields.length) and compare with the configured schema's total fields."],"exampleFix":"// before: sink schema has 3 columns but row has 4 fields\n// after: add the 4th column to the sink schema or use a FieldMapper transform to drop it","handlingStrategy":"validation","validationCode":"if (row.getFields().length != rowType.getTotalFields()) { throw new IllegalStateException(\"row/schema field count mismatch\"); }","typeGuard":null,"tryCatchPattern":"try { sink.write(row); } catch (IndexOutOfBoundsException e) { /* fix upstream schema mapping */ }","preventionTips":["Keep source, transform, and sink schemas in sync","Add a schema-check unit test between pipeline stages","Use FieldMapper to enforce exact column counts before the sink"],"tags":["csv","serialization","schema-mismatch"],"backgroundTag":"schema-validation-failed","analyzedSha":"cf67b549a7a6c35fa0beb12d83c62892427ea919","analyzedAt":"2026-09-10T21:44:55.265Z","contentChangedAt":"2026-09-10T21:44:55.265Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}