Tomas Vondra <t...@fuzzy.cz> writes: > AFAIK it will work with reasonably precise estimates, but the point is > you need an estimate of distinct values of the whole group of columns. > So when you want to get an estimate for queries on columns (a,b), you > need the number of distinct value combinations of these two columns.
That seems likely to be even more unreliable than our existing single-column estimates :-( regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers