On tis, 2012-03-27 at 00:53 +0100, Greg Stark wrote: > Hm. So my original plan was dependent on adding the state-merge > function we've talked about in the past. Not all aggregate functions > necessarily can support such a function but I think all or nearly all > the builtin aggregates can. Certainly min,max, count, sum, avg, > stddev, array_agg can which are most of what people do. That would be > a function which can take two state variables and produce a new state > variable.
This information could also be useful to have in PL/Proxy (or similar FDWs) to be able to integrate aggregate computation into the language. Currently, you always have to do the state merging yourself. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
