1 files changed, 14 insertions, 0 deletions
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