1 files changed, 21 insertions, 0 deletions
diff --git a/lib/arel/nodes/grouping.rb b/lib/arel/nodes/grouping.rb
new file mode 100644
index 0000000000..0af1df1f7a
--- /dev/null
+++ b/lib/arel/nodes/grouping.rb
@@ -0,0 +1,21 @@
+module Arel
+  module Nodes
+    class Grouping < Arel::Nodes::Node
+      attr_accessor :expr
+
+      def initialize expression
+        @expr = expression
+      end
+
+      # FIXME: this method should go away.  I don't like people calling
+      # to_sql on non-head nodes.  This forces us to walk the AST until we
+      # can find a node that has a "relation" member.
+      #
+      # Maybe we should just use `Table.engine`?  :'(
+      def to_sql
+        viz = Visitors::ToSql.new Table.engine
+        viz.accept self
+      end
+    end
+  end
+end