From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
To: | Josh Berkus <josh(at)agliodbs(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Subject: | Re: what is good solution for support NULL inside string_to_array function? |
Date: | 2010-05-04 11:53:00 |
Message-ID: | x2w162867791005040453tc5c7ef5z9fd5711ffe457457@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
2010/5/4 Josh Berkus <josh(at)agliodbs(dot)com>:
>
>> quietly removing NULL is maybe good for compatibility but is wrong for
>> functionality.
>
> I agree. I wasn't aware of this little misfeature.
>
> Default display for NULL should be a zero-length string.
>
I disagree - NULL is NULL, not empty string (Oracle is different)
if array_to_string is equivalent to
x[1] || sep || x[2] || sep || x[3] || sep ....
then correct result is NULL
and then string_to_array and array_to_string are correct, because
string_to_array cannot contain any NULL symbol.
Regards
Pavel Stehule
> --
> -- Josh Berkus
> PostgreSQL Experts Inc.
> http://www.pgexperts.com
>
From | Date | Subject | |
---|---|---|---|
Next Message | Stephen Frost | 2010-05-04 13:12:48 | Re: max_standby_delay considered harmful |
Previous Message | Srinivas Naik | 2010-05-04 11:46:57 | Re: Reg: SQL Query for Postgres 8.4.3 |