On 2024/06/27, 17:06, "Tom Lane" <t...@sss.pgh.pa.us
<mailto:t...@sss.pgh.pa.us>> wrote:
> You can't. Whatever info is needed by operations on the type had better be
> embedded in the value.
OK, thanks, that's clear and easy enough. I'll ensure the the third parameter
to the input function is embedded in my opaque value.
I don't see another function getting passed the value so I'd assume that
(unless I return a MyType value from one of my own functions which would follow
its internal logic to determine which type modifiers to use) the only way a
MyType can get an initial value is via the input function. If the type is in a
table column the input function would be called with the default value
specified in external format if a value isn't specified during insert, but
either way it would always originate from the eternal format. I suppose when a
cast is involved it goes via the external format as well, right?
Are those sound assumptions to make or am I still way off base here?
--- Thanks for your time - Marthin Laubscher
