2011/2/10 mac_man2...@yahoo.it <mac_man2...@yahoo.it>: > Which operations invoke the sorting algorithms implemented in the sorting > module (tuplesort.c) ? > Of course, one of those operations invoking sorting is the ORDER BY clause > and the DISTINCT too. > > Moreover, the Merge Join should be implemented invoking sorting. > > Is there any other operation invoking sorting?
AFAIK, all set operators except for UNION ALL. (I am probably missing a whole boatload of other things.) Nicolas -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
