Clear the type_map as part of clear_cache!

Author: andynu

lib/active_record/connection_adapters/oracle_enhanced_adapter.rb

@@ -453,6 +453,11 @@ def reconnect! # :nodoc:
         @logger.warn "#{adapter_name} automatic reconnection failed: #{e.message}" if @logger
       end
 
+      def clear_cache!
+        self.class.clear_type_map!
+        super
+      end
+
       def reset!
         clear_cache!
         super
@@ -697,6 +702,10 @@ def type_map
             @type_map
           end
 
+          def clear_type_map!
+            @type_map = nil
+          end
+
         private
           def initialize_type_map(m)
             super