Error: a column definition list is required for functions in dblink using PostgreSQL 9.3 - postgresql

Question

I have the following function:
In which I am updating one database table by joining other database table by using the dblink().
I have installed:
create extension dblink;
The more details as shown below:
CREATE OR REPLACE FUNCTION Fun_test
(
Table_Name varchar
)
RETURNS void AS
$BODY$
DECLARE
dynamic_statement varchar;
BEGIN
perform dblink_connect('port=5234 dbname=testdb user=postgres password=****');
dynamic_statement := 'With CTE AS
(
Select HNumber,JoiningDate,Name,Address
From '|| Table_Name ||'c
)
, Test_A
AS
(
Select Row_Number() over ( Partition by PNumber order by Date1 Desc,Date2 Desc) AS roNum,
Name,PNumber,Date1,Address
From dblink(
''Select distinct PNumber,
(
case when fname is null then '' else fname end || '' ||
case when lname is null then '' else lname end
) as FullName,
Address,
Date1,Date2
From testdb_Table
inner join CTE on CTE.HNumber = PNumber''
) Num
)
Update CTE
Set
Name = Test_A.FullName
,SubAddress_A = Test_A.Address
,Date1 = Test_A.Date1
from CTE
left outer join Test_A on
CTE.HNumber= Test_A.PNumber
where roNum =1';
RAISE INFO '%',dynamic_statement;
EXECUTE dynamic_statement;
perform dblink_disconnect();
END;
$BODY$
LANGUAGE PLPGSQL;
Calling Function:
select fun_test('test1');
Getting an error:
ERROR: a column definition list is required for functions returning "record"
LINE 11: From dblink
^

Answer 1

You have to tell PostgreSQL what the columns the dblink query will return are.
See the manual for dblink for details.
This is the same as for any function returning a runtime-determined record type. You can't query it without telling PostgreSQL what the column layout of the results will be.
You use a column specifier list, e.g.
SELECT * FROM my_function_returning_record() f(col1 text, col2 integer);
If you are on a current PostgreSQL version you may want to look at postgres_fdw as an alternative to dblink.