You can generate indexes for your custom functions, though,
which will speed things up. This is what I've done, successfully.
Troy
>
> JBJ <postgre@totw.org> writes:
> > Furthermore I will have to be able to switch between is_IS and others to
> > get the correct sort order ( russian sort order different from icelandic
> > for example, simply due to the nature of the letters) live when the user
> > selects a different language.
>
> Postgres can't do that at the moment :-(. You might be able to hack up
> some custom functions to do something like
> ORDER BY icelandic(text_col)
> but it'll be messy, and probably slow.
>
> regards, tom lane
>
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