2009/11/15 Tom Lane <t...@sss.pgh.pa.us>: > Andrew Gierth <and...@tao11.riddles.org.uk> writes: >> (A question here: the spec allows (by my reading) the use of >> parameters in the window frame clause, i.e. BETWEEN $1 PRECEDING AND >> $2 FOLLOWING. Wouldn't it therefore make more sense to treat the >> values as Exprs, albeit very limited ones, and eval them at startup >> rather than assuming we know the node type and digging down into it >> all over the place?) > > Seems like you might as well allow any expression not containing > local Vars. Compare the handling of LIMIT.
Hmm, I've read it wrong, was assuming a constant for <unsigned value specification> which actually includes any expression. But it's a fixed value during execution, right? Otherwise, we cannot predicate frame boundary. Regards, -- Hitoshi Harada -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
