protected JdbcDeserializationConverter createNullableInternalConverter(LogicalType type) {
        return wrapIntoNullableInternalConverter(createInternalConverter(type));
    }
Create a nullable runtime {@link JdbcDeserializationConverter} from given {@link
LogicalType}.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/jdbc/src/main/java/org/apache/inlong/sort/jdbc/converter/AbstractJdbcRowConverter.java