default Object convert(GenericRowData row) {
            return convert(row, -1);
        }
Converter that extracts a metadata field from the row that comes out of the JSON schema and
converts it to the desired data type.
inlong-sort/sort-formats/format-row/format-json-v1.13/src/main/java/org/apache/inlong/sort/formats/json/canal/CanalJsonEnhancedDeserializationSchema.java