pasman pasmański <pasman.p@xxxxxxxxx> Sunday 25 of September 2011 15:19:28 > Hi. > > I propose to add "accumulative" flag to a function definition. This > flag would be set for function f(x) which is accumulative and > immutable. > > This flag allows to use an index on x for clauses containing f(x): > > where f(x) = const I think for this index designe will require that f(x) will be stored, additional behaviour of fucntion are not required, is quite enaugh that it will be function. > where f(x) > const > > and so on. By this assume that "accumulative" function is (weakly) increasing or decreasing f such that x < y => f(x) <= f(y) ? I only may deduce it for idea that search will be faster on index. Regards, Radosław Smogura http://softperience.eu/ -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
