diff -rc MT-3.121-full-ja.org/lib/MT/ObjectDriver/DBI/postgres.pm MT-3.121-full-ja/lib/MT/ObjectDriver/DBI/postgres.pm
*** MT-3.121-full-ja.org/lib/MT/ObjectDriver/DBI/postgres.pm	2004-12-30 05:13:35.103692376 +0900
--- MT-3.121-full-ja/lib/MT/ObjectDriver/DBI/postgres.pm	2004-12-30 05:15:51.035027672 +0900
***************
*** 78,83 ****
--- 78,98 ----
              $sql = $s_sql . $sql;
              $w_sql .= ") t\n";
          }
+         elsif ($j_args->{'aggregate_sort'}) {
+             ## sorting with aggregate function ,
+             my $as_args = $j_args->{'aggregate_sort'};
+             my $cols = $class->column_names;
+             my $s_sql = "from (select " .
+                         join(', ', map "${tbl}_$_", @$cols) .
+                         ", $as_args->{'function'} (${j_tbl}_$as_args->{'column'}) as ${tbl}_${j_tbl}_$as_args->{'column'}\n";
+             $sql = $s_sql . $sql;
+             $w_sql .= "group by " .
+                       join(', ', map "${tbl}_$_", @$cols) . "\n";
+             $w_sql .= ") t\n";
+             my $dir = $as_args->{'direction'} &&
+                       $as_args->{'direction'} eq 'descend' ? 'desc' : 'asc';
+             $w_sql .= "order by ${tbl}_${j_tbl}_$as_args->{'column'} $dir\n";
+         }
  
          if (my $n = $j_args->{limit}) {
              $n =~ s/\D//g;   ## Get rid of any non-numerics.
diff -rc MT-3.121-full-ja.org/lib/MT/Template/Context.pm MT-3.121-full-ja/lib/MT/Template/Context.pm
*** MT-3.121-full-ja.org/lib/MT/Template/Context.pm	2004-12-30 05:13:35.108691616 +0900
--- MT-3.121-full-ja/lib/MT/Template/Context.pm	2004-12-30 05:14:27.741690184 +0900
***************
*** 741,750 ****
          } elsif (my $n = $args->{recently_commented_on}) {
              $args{'join'} = [ 'MT::Comment', 'entry_id',
                  { blog_id => $blog_id, visible => 1 },
!                 { 'sort' => 'created_on',
!                   direction => 'descend',
!                   unique => 1,
!                   limit => $n } ];
              $no_resort = 1;
          }
          @entries = MT::Entry->load(\%terms, \%args);
--- 741,750 ----
          } elsif (my $n = $args->{recently_commented_on}) {
              $args{'join'} = [ 'MT::Comment', 'entry_id',
                  { blog_id => $blog_id, visible => 1 },
!                 { 'aggregate_sort' => { 'column' => 'created_on',
!                                         'function' => 'max',
!                                         'direction' => 'descend' },
!                     limit => $n } ];
              $no_resort = 1;
          }
          @entries = MT::Entry->load(\%terms, \%args);