Re: Polymorphic arguments and composite types

On Fri, 2007-10-05 at 12:29 -0400, Tom Lane wrote:
> Jeff Davis <pgsql(at)j-davis(dot)com> writes:
> > You could do something like:
> > SELECT * FROM c AS c1, c AS c2 WHERE ARRAY[c1.col1] <@ ANY(SELECT c2.col2);
>
> Good point --- actually he could convert it back to the original
> subselect style, as long as he's using the correct operator:
>
> SELECT * FROM c WHERE ARRAY[col1] <@ ANY(SELECT col2 FROM c);

You're right, that's a better example.

>
> The one-element-array trick seems a bit awkward though. I wonder
> why we don't have an "anyelement <@ anyarray" kind of operator...
>

I thought we did -- until I decided to test my example in psql before
hitting "send". It certainly makes sense to me that we should have it.

Regards,
Jeff Davis