No need to specify DISTINCT because u.* guaranties distinct by id.

diff --git a/lib/datalib.php b/lib/datalib.php
index 8ab06350188eae0650320f45386a4f39ac468cc5..76d651c654f850d2b25d1ea6abdedfdc9d69730a 100644 (file)
--- a/lib/datalib.php
+++ b/lib/datalib.php
@@ -77,7 +77,7 @@ function get_admins() {
     
     $context = get_context_instance(CONTEXT_SYSTEM, SITEID);
 
-    return get_users_by_capability($context, 'moodle/legacy:admin', 'distinct u.*, ra.id as adminid', ' ORDER BY ra.id ASC '); // only need first one
+    return get_users_by_capability($context, 'moodle/legacy:admin', 'u.*, ra.id as adminid', ' ORDER BY ra.id ASC '); // only need first one
                              
 }