Hi all,

Seems that CHAR_LENGTH function has a bug.
It doesn't work if you try to have the length of columns with nulls.
Example:

insert into c values('foo');
insert into c values(NULL);
insert into c values('');

select b from c;
b
-------
foo
            <-- this is a NULL
            <-- this is a ''
(3 rows)

select char_length(b) from c;
ERROR:  Bad (null) varchar() external representation

-- Why this error? 
-- I think it should be:

length
------
     3
        <-- length of NULL should be "unknown" this is the behavior of
other databases
     0
(3 rows)
 
What do you think about ?
       Jose'

Thu, 24 Sep 1998 09:39:46 +0200
"Jose' Soares" <jose@sferacarta.com>
bug on CHAR_LENGTH function ?
> select char_length(b) from c;
> ERROR:  Bad (null) varchar() external representation

This is covered in our thread with Colin...

                     - Tom

Thu, 24 Sep 1998 13:52:11 +0000
"Thomas G. Lockhart" <lockhart@alumni.caltech.edu>
Re: [HACKERS] bug on CHAR_LENGTH function ?