OK, I have now finished up my psort reconstruction project. Sort nodes
and btree CREATE INDEX now use the same sorting module, which is better
than either one was to start with.
This resolves the following TODO items:
* Make index creation use psort code, because it is now faster(Vadim)
* Allow creation of sort temp tables > 1 Gig
Also, sorting will now notice if it runs out of disk space, which it
frequently would not before :-(. Both memory and disk space are used
more sparingly than before, as well.
regards, tom lane
