> I'm also kind of wondering if the main use-cases couldn't be met with
> suitable multi-input custom aggregates, which is something we already
> have as of 8.2.

Actually, given that "skyline of" is *only* for aggregate sorting (as far as I 
can tell) it doesn't present the complications which QBE did for using a 
function interface.   

Ranbeer, would it be possible to use an aggregate function syntax instead of 
the SKYLINE OF syntax extension?   This allows us to sidestep the issue of 
non-standard additions to the reserved word list.

Josh Berkus
PostgreSQL @ Sun
San Francisco

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