In ordered_set_startup() sorts are initialised in non-randomAccess mode (tuplesort_begin_heap() and ~datum(), last argument).
The use of tuplesort_skip_tuples() feels very like a random access to me. I think it doesn't fail because the only use (and implementation) is to skip forwards; if backwards were tried (as the interface permits) external sorts would fail because multiple tapes are present for FINALMERGE. -- Cheers, Jeremy -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
