On Tue, 2008-09-02 at 15:51 +0300, Heikki Linnakangas wrote: > The needs of access to the rows are so different that it seems best to > me to delegate the buffering to the window function.
That seems sensible in some ways, not others. Some of the window functions, like lead and lag merely specify window size and shape for other functions to act upon. For those types of request I don't see any need for custom functions, whereas for the comparison/calculation functions there might be a need. We don't need to implement all the things the SQL Standard calls window functions with a 1:1 mapping to Postgres functions. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
