Re: Selecting a constant question - Mailing list pgsql-hackers

From Andrew Dunstan
Subject Re: Selecting a constant question
Date
Msg-id 466DE4C5.9020102@dunslane.net
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In response to Re: Selecting a constant question  ("Larry McGhaw" <lmcghaw@connx.com>)
Responses Re: Selecting a constant question  ("Dann Corbit" <DCorbit@connx.com>)
List pgsql-hackers

Larry McGhaw wrote:
> 4) libpq **cannot** describe the maximum internal data size of a char or
> varchar constant!
> Example:  select '123' from <any table>
>
> This is clearly a bug or serious oversight in libpq that should be
> addressed.
>
> The database *knows* this size of the char constant (obviously), and
> should report the size via a metadata call, as all other relational
> databases do.
>
>   
>   

What is not clear to me is why it is so important for you to know the 
length of a piece of data you are supplying. If it is so vitally 
important, you could always cast it, e.g. select '123'::varchar(3)

cheers

andrew


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