Wikimedia Bugzilla is closed!

When using a database that requires non-aggregated columns in the GROUP BY (e.g. Postgres), SpecialActiveusers fails because the user_name and user_id columns are brought back unaggregatged, but do not appear in the GROUP BY. The solution is to change SpecialActiveusers.php, inside of getQueryInfo, the abovementioned columns should be added to the GROUP BY array. Alternatively, if this is suboptimal for MySQL, the list of grouped columns should be conditional based on the implicitGroupby property of the database (see for example WikiPage.php).