Mysql, fix stackoverflow in some tests due unable to find type

Author: JesseChavez

lib/arjdbc/mysql/adapter.rb

@@ -41,8 +41,26 @@ def jdbc_connection_class
         def new_client(conn_params, adapter_instance)
           jdbc_connection_class.new(conn_params, adapter_instance)
         end
+
+        private
+          def initialize_type_map(m)
+            super
+
+            m.register_type(%r(char)i) do |sql_type|
+              limit = extract_limit(sql_type)
+              Type.lookup(:string, adapter: :mysql2, limit: limit)
+            end
+
+            m.register_type %r(^enum)i, Type.lookup(:string, adapter: :mysql2)
+            m.register_type %r(^set)i,  Type.lookup(:string, adapter: :mysql2)
+          end
       end
 
+      # NOTE: redefines constant defined in abstract class however this time
+      # will use methods defined in the mysql abstract class and map properly
+      # mysql types.
+      TYPE_MAP = Type::TypeMap.new.tap { |m| initialize_type_map(m) }
+
       def initialize(...)
         super
 
@@ -58,11 +76,6 @@ def initialize(...)
         @connection_parameters ||= @config
       end
 
-      # NOTE: redefines constant defined in abstract class however this time
-      # will use methods defined in the mysql abstract class and map properly
-      # mysql types.
-      TYPE_MAP = Type::TypeMap.new.tap { |m| initialize_type_map(m) }
-
       def self.database_exists?(config)
         conn = ActiveRecord::Base.mysql2_connection(config)
         conn && conn.really_valid?