On Mon, Nov 13, 2017 at 12:40 PM, Peter Geoghegan <pg@xxxxxxx> wrote: >> Do I have to explicitly specify collation when using ORDER by on that column for index and abbreviated keys to be used? > > Only if you didn't define the column with a per-column collation initially. BTW, if you specifically want to quickly verify whether or not abbreviated keys were used, you can do that by setting "trace_sort = on", and possibly setting "client_min_messages = LOG", too. There should be quite a bit of debug output from that that specifically mentions abbreviated keys. -- Peter Geoghegan -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
