Merge branch '2-0-stable' into merge

* 2-0-stable:
  updating history
  Patched Arel v2.0.6 to support MSSQL SQL queries. Based on work of James Abley (https://github.com/jabley/arel).
  consolidating dot visitor methods
  refactoring where, fixing subselect
  implementation for passing a subquery to #in and #not_in
  tests for passing a subquery to #in and #not_in
  limit members of the AST are visited
  quoting limit nodes

Conflicts:
	History.txt
	lib/arel/nodes.rb
	lib/arel/nodes/select_core.rb
	lib/arel/select_manager.rb
	lib/arel/visitors/to_sql.rb
	test/visitors/test_to_sql.rb

4 files changed, 19 insertions, 3 deletions

diff --git a/lib/arel/nodes/limit.rb b/lib/arel/nodes/limit.rb
new file mode 100644
index 0000000000..68ea95daf5
--- /dev/null
+++ b/lib/arel/nodes/limit.rb
@@ -0,0 +1,7 @@
+module Arel
+  module Nodes
+    class Limit < Arel::Nodes::Unary
+    end
+  end
+end
+
diff --git a/lib/arel/nodes/select_core.rb b/lib/arel/nodes/select_core.rb
index 8eb7c0d3e7..7f577e0a05 100644
--- a/lib/arel/nodes/select_core.rb
+++ b/lib/arel/nodes/select_core.rb
@@ -1,11 +1,12 @@
 module Arel
   module Nodes
     class SelectCore < Arel::Nodes::Node
-      attr_accessor :projections, :wheres, :groups
+      attr_accessor :top, :projections, :wheres, :groups
       attr_accessor :having, :source
 
       def initialize
         @source      = JoinSource.new nil
+        @top         = nil
         @projections = []
         @wheres      = []
         @groups      = []
diff --git a/lib/arel/nodes/top.rb b/lib/arel/nodes/top.rb
new file mode 100644
index 0000000000..56e2e97e8d
--- /dev/null
+++ b/lib/arel/nodes/top.rb
@@ -0,0 +1,6 @@
+module Arel
+  module Nodes
+    class Top < Arel::Nodes::Unary
+    end
+  end
+end
diff --git a/lib/arel/nodes/unary.rb b/lib/arel/nodes/unary.rb
index f679017597..e1576b9c99 100644
--- a/lib/arel/nodes/unary.rb
+++ b/lib/arel/nodes/unary.rb
@@ -10,12 +10,14 @@ module Arel
     end
 
     %w{
-      Not
       Group
       Grouping
-      Offset
       Having
+      Limit
+      Not
+      Offset
       On
+      Top
     }.each do |name|
       const_set(name, Class.new(Unary))
     end