haruki-830 opened a new pull request, #4416: URL: https://github.com/apache/flink-cdc/pull/4416
**Summary** This commit fixes the Debezium JSON serialization failure when columns have non-string default value expressions in the Kafka sink connector, ensuring type-safe default value handling during CDC synchronization operations. **Key Changes** 1. Default Value Type Conversion - Added convertDefaultValue method to DebeziumJsonSerializationSchema that converts string default value expressions to the correct Java type matching the Debezium schema - Supports comprehensive type coverage: BOOLEAN, TINYINT, SMALLINT, INTEGER, BIGINT, FLOAT, DOUBLE, DECIMAL, DATE, TIME, TIMESTAMP, TIMESTAMP_WITH_TIME_ZONE, BINARY, VARBINARY, CHAR, VARCHAR, and TIMESTAMP_WITH_LOCAL_TIME_ZONE - Added NumberFormatException handling with WARN-level logging to gracefully skip unconvertible default values instead of failing 2. Schema Serialization Fix - Updated convertCDCDataTypeToDebeziumDataType(Column) to invoke convertDefaultValue instead of directly passing the raw string expression to field.defaultValue() - Previously, passing a string default value to a non-string Debezium schema field would fail 3. Supporting Additions - Added Logger and LoggerFactory for conversion failure logging - Added BigDecimal and RoundingMode imports for DECIMAL type default value handling 4. Comprehensive Testing - Added testSerializeWithNonStringDefaultValues test covering all supported type conversions - Verifies that schema serialization with default values no longer throws type mismatch exceptions - Validates correct Debezium JSON output including default fields in the schema section **Before Fix** Column with INT type and default value "10" → serialization fails with type mismatch error **After Fix** Column with INT type and default value "10" → correctly serialized as "default": 10 in Debezium schema **JIRA Reference** [https://issues.apache.org/jira/browse/FLINK-39757](url) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
