On Tue, Nov 24, 2015 at 4:46 PM, Simon Riggs <si...@2ndquadrant.com> wrote: >> I had a debug GUC (like the existing one to disable top-N heapsorts) >> that disabled "quicksort with spillover". That's almost the opposite >> of what you're asking for, though, because that makes us never use a >> heap. You're asking for me to write a GUC to always use a heap. > > > I'm asking for a parameter to confirm results from various algorithms, so we > can get many eyeballs to confirm your work across its breadth. This is > similar to the original trace_sort parameter which we used to confirm > earlier sort improvements. I trust it will show this is good and can be > removed prior to release of 9.6.
My patch updates trace_sort messages. trace_sort doesn't change the behavior of anything. The only time we've ever done anything like this was for Top-N heap sorts. This is significantly more inconvenient than you think. See the comments in the new dumpbatch() function. -- Peter Geoghegan -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
