Re: proposal casting from XML[] to int[], numeric[], text[]

"Nikolay Samokhvalov" <samokhvalov@gmail.com> writes:
> Alternative (and maybe better) approach would be:
>  - create comparison functions that work in the same way as string
> comparison functions do (currently, it's straight forward since XML is
> stored as string);
>  - do NOT create comparison operators to avoid explicit comparing XML values
> (to follow standard ways to work with XML and to avoid possible unexpected
> behaviors);
>  - create opclass based on these functions and, therefore, obtain GIN
> indexes support for xml[];

I'm not clear on what you're proposing.  There is no such thing as an
opclass with no operators (or at least, not a useful one), so this seems
mutually contradictory.
        regards, tom lane