1 files changed, 26 insertions, 0 deletions
diff --git a/lib/arel/algebra/relations/row.rb b/lib/arel/algebra/relations/row.rb
new file mode 100644
index 0000000000..3158557448
--- /dev/null
+++ b/lib/arel/algebra/relations/row.rb
@@ -0,0 +1,26 @@
+module Arel
+  class Row
+    attributes :relation, :tuple
+    deriving :==, :initialize
+
+    def [](attribute)
+      attribute.type_cast(tuple[relation.position_of(attribute)])
+    end
+
+    def slice(*attributes)
+      Row.new(relation, attributes.inject([]) do |cheese, attribute|
+        # FIXME TESTME method chaining
+        cheese << tuple[relation.relation.position_of(attribute)]
+        cheese
+      end)
+    end
+
+    def bind(relation)
+      Row.new(relation, tuple)
+    end
+
+    def combine(other, relation)
+      Row.new(relation, tuple + other.tuple)
+    end
+  end
+end