def default_owner
      unless defined? @default_owner
        username = config[:username] ? config[:username].to_s : jdbc_connection.meta_data.user_name
        @default_owner = username.nil? ? nil : username.upcase
      end
      @default_owner
    end
def default_owner
      unless defined? @default_owner
        username = config[:username] ? config[:username].to_s : jdbc_connection.meta_data.user_name
        @default_owner = username.nil? ? nil : username.upcase
      end
      @default_owner
    end
default schema owner