1 files changed, 2 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb
index 7a28a98721..df72ba7e9c 100644
--- a/activerecord/lib/active_record/relation/calculations.rb
+++ b/activerecord/lib/active_record/relation/calculations.rb
@@ -71,6 +71,7 @@ module ActiveRecord
     #
     #   Person.sum(:age) # => 4562
     def sum(*args)
+      return super if block_given?
       calculate(:sum, *args)
     end
 
@@ -138,7 +139,7 @@ module ActiveRecord
     #   # SELECT people.id, people.name FROM people
     #   # => [[1, 'David'], [2, 'Jeremy'], [3, 'Jose']]
     #
-    #   Person.pluck('DISTINCT role')
+    #   Person.uniq.pluck(:role)
     #   # SELECT DISTINCT role FROM people
     #   # => ['admin', 'member', 'guest']
     #