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Re: CAST function for user defined type

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On Mon, Jan 22, 2007 at 11:40:08AM -0500, Tom Lane wrote:
> Ron Peterson <ron.peterson@xxxxxxxxxxxxxx> writes:
> > That cleared one hurdle, but I'm still not there yet.
> 
> > % select 'fe43d07c0c624786bebfcb3357a2a13a'::y_octet_16;
> >             y_octet_16
> > ----------------------------------
> >  fe43d07c0c624786bebfcb3357a2a13a
> 
> That's not invoking any cast function, but the type's typinput function
> (applied to a C-string).
> 
> > When things are connected up this way,
> > what should the cast function expect to see as input?
> 
> > % select encode( y_uuid_generate(), 'hex' )::y_octet_16;
> > ERROR:  input string contains invalid characters
> 
> If it's a cast from TEXT, it'll get the internal form of a TEXT datum,
> ie, a counted (and not null-terminated) string.  You might look at
> textin() and textout() to grok the difference.

Got it working now.  Thanks.

-- 
Ron Peterson
https://www.yellowbank.com/


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