protected JdbcDeserializationConverter wrapIntoNullableInternalConverter(
            JdbcDeserializationConverter jdbcDeserializationConverter) {
        return val -> {
            if (val == null) {
                return null;
            } else {
                return jdbcDeserializationConverter.deserialize(val);
            }
        };
    }
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