3 files changed, 3 insertions, 4 deletions
diff --git a/lib/arel/engines/memory/predicates.rb b/lib/arel/engines/memory/predicates.rb
index e36afa38c2..1527b04056 100644
--- a/lib/arel/engines/memory/predicates.rb
+++ b/lib/arel/engines/memory/predicates.rb
@@ -1,6 +1,6 @@
 module Arel
   module Predicates
-    class Binary < Predicate
+    class Binary < Unary
       def eval(row)
         operand1.eval(row).send(operator, operand2.eval(row))
       end
diff --git a/lib/arel/engines/sql/engine.rb b/lib/arel/engines/sql/engine.rb
index 07940c6ef1..a314a972c0 100644
--- a/lib/arel/engines/sql/engine.rb
+++ b/lib/arel/engines/sql/engine.rb
@@ -4,11 +4,10 @@ module Arel
 
       def initialize(ar = nil)
         @ar = ar
-        @connection = nil
       end
 
       def connection
-        @connection ||= @ar && @ar.connection
+        @ar ? @ar.connection : nil
       end
 
       def adapter_name
diff --git a/lib/arel/engines/sql/predicates.rb b/lib/arel/engines/sql/predicates.rb
index 21d8f840c9..74a36d77c9 100644
--- a/lib/arel/engines/sql/predicates.rb
+++ b/lib/arel/engines/sql/predicates.rb
@@ -1,6 +1,6 @@
 module Arel
   module Predicates
-    class Binary < Predicate
+    class Binary < Unary
       def to_sql(formatter = nil)
         "#{operand1.to_sql} #{predicate_sql} #{operand1.format(operand2)}"
       end