Matthew Wakeling <matthew@flymine.org> writes:
> I have discovered that creating large arrays in plpgql is rather slow. In
> fact, it seems to be O(n^2).
For variable-width element types, yeah. Don't go that way.
> ... alternatively is there a way to read two results streams
> simultaneously?
Use two cursors and FETCH from each as needed? In recent releases you
can even scroll backwards, which you're going to need to do to make
a merge join work.
regards, tom lane