Re: [HACKERS] CTE inlining

Craig Ringer <craig.ringer@2ndquadrant.com> writes:
> - as you noted, it is hard to decide when it's worth inlining vs
> materializing for CTE terms referenced more than once.

[ raised eyebrow... ]  Please explain why the answer isn't trivially
"never".

There's already a pretty large hill to climb here in the way of
breaking peoples' expectations about CTEs being optimization
fences.  Breaking the documented semantics about CTEs being
single-evaluation seems to me to be an absolute non-starter.
        regards, tom lane