private StringConverter createConverter(LogicalType type) {
        return wrapIntoNullableConverter(createNotNullConverter(type));
    }
Formatter for SQL string representation of a timestamp value (with UTC timezone).
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/table/OldFieldMetadataConverter.java