2 files changed, 11 insertions, 0 deletions
diff --git a/activerecord/lib/arel/nodes/bind_param.rb b/activerecord/lib/arel/nodes/bind_param.rb
index 91e9b2b70f..ba8340558a 100644
--- a/activerecord/lib/arel/nodes/bind_param.rb
+++ b/activerecord/lib/arel/nodes/bind_param.rb
@@ -23,6 +23,10 @@ module Arel # :nodoc: all
       def nil?
         value.nil?
       end
+
+      def boundable?
+        !value.respond_to?(:boundable?) || value.boundable?
+      end
     end
   end
 end
diff --git a/activerecord/lib/arel/nodes/equality.rb b/activerecord/lib/arel/nodes/equality.rb
index 2aa85a977e..551d56c2ff 100644
--- a/activerecord/lib/arel/nodes/equality.rb
+++ b/activerecord/lib/arel/nodes/equality.rb
@@ -7,5 +7,12 @@ module Arel # :nodoc: all
       alias :operand1 :left
       alias :operand2 :right
     end
+
+    %w{
+      IsDistinctFrom
+      IsNotDistinctFrom
+    }.each do |name|
+      const_set name, Class.new(Equality)
+    end
   end
 end