2 files changed, 24 insertions, 8 deletions

diff --git a/lib/arel/engines/sql/primitives.rb b/lib/arel/engines/sql/primitives.rb
index c4968558a2..6f89723afe 100644
--- a/lib/arel/engines/sql/primitives.rb
+++ b/lib/arel/engines/sql/primitives.rb
@@ -3,7 +3,7 @@ module Arel
     def column
       original_relation.column_for(self)
     end
-        
+
     def format(object)
       object.to_sql(Sql::Attribute.new(self))
     end
@@ -14,6 +14,8 @@ module Arel
   end
 
   class Value
+    delegate :inclusion_predicate_sql, :equality_predicate_sql, :to => :value
+
     def to_sql(formatter = Sql::WhereCondition.new(relation))
       formatter.value value
     end
@@ -22,33 +24,33 @@ module Arel
       object.to_sql(Sql::Value.new(relation))
     end
   end
-  
+
   class Expression < Attribute
     def to_sql(formatter = Sql::SelectClause.new(relation))
       formatter.expression self
     end
   end
-  
+
   class Count < Expression
     def function_sql; 'COUNT' end
   end
-  
+
   class Distinct < Expression
     def function_sql; 'DISTINCT' end
   end
-  
+
   class Sum < Expression
     def function_sql; 'SUM' end
   end
-  
+
   class Maximum < Expression
     def function_sql; 'MAX' end
   end
-  
+
   class Minimum < Expression
     def function_sql; 'MIN' end
   end
-  
+
   class Average < Expression
     def function_sql; 'AVG' end
   end
diff --git a/lib/arel/engines/sql/relations/operations/join.rb b/lib/arel/engines/sql/relations/operations/join.rb
index be21119bc9..2f5e23644e 100644
--- a/lib/arel/engines/sql/relations/operations/join.rb
+++ b/lib/arel/engines/sql/relations/operations/join.rb
@@ -16,4 +16,18 @@ module Arel
       end
     end
   end
+
+  class InnerJoin < Join
+    def join_sql; "INNER JOIN" end
+  end
+
+  class OuterJoin < Join
+    def join_sql; "OUTER JOIN" end
+  end
+
+  class StringJoin < Join
+    def joins(_, __ = nil)
+      relation2
+    end
+  end
 end
\ No newline at end of file