"Kevin Grittner" <Kevin.Grittner@xxxxxxxxxxxx> writes: > Alexander Korotkov <aekorotkov@xxxxxxxxx> wrote: >>> I just don't find why it is coincidence. I think that such plan >>> will always produce result ordered by two columns, because such >>> nested index scan always produce this result. > Assuming a nested index scan, or any particular plan, is unwise. I think he's proposing that the planner should recognize that a plan of this type produces a result sorted by the additional index columns. I'm not convinced either that the sortedness property really holds, or that it would be worth the extra planning effort to check for; but it's not a fundamentally misguided proposal. regards, tom lane -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
