diff --git a/lib/arel/visitors/dot.rb b/lib/arel/visitors/dot.rb
index a65a7f73..3d25d5f0 100644
--- a/lib/arel/visitors/dot.rb
+++ b/lib/arel/visitors/dot.rb
@@ -28,6 +28,10 @@ def accept object
       end
 
       private
+      def visit_Arel_Nodes_Grouping o
+        visit_edge o, "expr"
+      end
+
       def visit_Arel_Nodes_TableAlias o
         visit_edge o, "name"
         visit_edge o, "relation"
@@ -104,6 +108,7 @@ def visit_Arel_Nodes_Equality o
       alias :visit_Arel_Nodes_GreaterThan        :visit_Arel_Nodes_Equality
       alias :visit_Arel_Nodes_GreaterThanOrEqual :visit_Arel_Nodes_Equality
       alias :visit_Arel_Nodes_Assignment         :visit_Arel_Nodes_Equality
+      alias :visit_Arel_Nodes_In                 :visit_Arel_Nodes_Equality
 
       def visit_String o
         @node_stack.last.fields << o
diff --git a/lib/arel/visitors/to_sql.rb b/lib/arel/visitors/to_sql.rb
index 7f9186d2..974f9f53 100644
--- a/lib/arel/visitors/to_sql.rb
+++ b/lib/arel/visitors/to_sql.rb
@@ -7,13 +7,13 @@ class ToSql
       def initialize engine
         @engine         = engine
         @connection     = nil
-        @last_column    = []
+        @last_column    = nil
         @quoted_tables  = {}
         @quoted_columns = {}
       end
 
       def accept object
-        @last_column = []
+        @last_column = nil
         @engine.connection_pool.with_connection do |conn|
           @connection = conn
           visit object
@@ -195,8 +195,9 @@ def visit_Arel_Table o
 
       def visit_Arel_Nodes_In o
         right = o.right
-        right = right.empty? ? 'NULL' : right.map { |x| visit x }.join(', ')
-        "#{visit o.left} IN (#{right})"
+        "#{visit o.left} IN (#{
+          right.empty? ? 'NULL' : right.map { |x| visit x }.join(', ')
+        })"
       end
 
       def visit_Arel_Nodes_NotIn o
@@ -243,7 +244,7 @@ def visit_Arel_Nodes_UnqualifiedColumn o
       end
 
       def visit_Arel_Attributes_Attribute o
-        @last_column.push o.column
+        @last_column = o.column
         join_name = o.relation.table_alias || o.relation.name
         "#{quote_table_name join_name}.#{quote_column_name o.name}"
       end
@@ -257,7 +258,7 @@ def visit_Fixnum o; o end
       alias :visit_Arel_Nodes_SqlLiteral :visit_Fixnum
       alias :visit_Arel_SqlLiteral :visit_Fixnum # This is deprecated
 
-      def visit_String o; quote(o, @last_column.pop) end
+      def visit_String o; quote(o, @last_column) end
 
       alias :visit_ActiveSupport_Multibyte_Chars :visit_String
       alias :visit_BigDecimal :visit_String
diff --git a/spec/visitors/to_sql_spec.rb b/spec/visitors/to_sql_spec.rb
index c234a2d5..1302d73e 100644
--- a/spec/visitors/to_sql_spec.rb
+++ b/spec/visitors/to_sql_spec.rb
@@ -94,6 +94,21 @@ module Visitors
             "users"."id" >= 1 AND "users"."id" < 3
           }
         end
+
+        it 'uses the same column for escaping values' do
+          visitor = Class.new(ToSql) do
+            attr_accessor :expected
+
+            def quote value, column = nil
+              raise unless column == expected
+              super
+            end
+          end
+          in_node = Nodes::In.new @attr, %w{ a b c }
+          visitor = visitor.new(Table.engine)
+          visitor.expected = @attr.column
+          lambda { visitor.accept(in_node) }.should_not raise_error
+        end
       end
 
       describe 'Equality' do