1 files changed, 35 insertions, 0 deletions
diff --git a/lib/arel/engines/memory/predicates.rb b/lib/arel/engines/memory/predicates.rb
new file mode 100644
index 0000000000..03d4f25b0a
--- /dev/null
+++ b/lib/arel/engines/memory/predicates.rb
@@ -0,0 +1,35 @@
+module Arel
+  class Binary < Predicate
+    def eval(row)
+      operand1.eval(row).send(operator, operand2.eval(row))
+    end
+  end
+
+  class Equality < Binary
+    def operator; :== end
+  end
+
+  class GreaterThanOrEqualTo < Binary
+    def operator; :>= end
+  end
+
+  class GreaterThan < Binary
+    def operator; :> end
+  end
+
+  class LessThanOrEqualTo < Binary
+    def operator; :<= end
+  end
+
+  class LessThan < Binary
+    def operator; :< end
+  end
+
+  class Match < Binary
+    def operator; :=~ end
+  end
+
+  class In < Binary
+    def operator; :include? end
+  end
+end