code: def update(self, query_name, saved_query_attributes):
          
  
          query_name_attr_name = "query_name"
          refresh_rate_attr_name = "refresh_rate"
          query_attr_name = "query"
          metadata_attr_name = "metadata"
  
          old_saved_query = self.get(query_name)
  
          # Create a new query def to send back. We cannot send values for attributes like 'urls',
          # 'last_modified_date', 'run_information', etc.
          new_saved_query = {
              query_name_attr_name: old_saved_query[query_name_attr_name], # expected
              refresh_rate_attr_name: old_saved_query[refresh_rate_attr_name], # expected
              query_attr_name: {}
          }
  
          # If metadata was set, preserve it. The Explorer UI currently stores information here.
          old_metadata = (old_saved_query[metadata_attr_name]
                         if metadata_attr_name in old_saved_query
                         else None)
  
          if old_metadata:
              new_saved_query[metadata_attr_name] = old_metadata
  
          # Preserve any non-empty properties of the existing query. We get back values like None
          # for 'group_by', 'interval' or 'timezone', but those aren't accepted values when updating.
          old_query = old_saved_query[query_attr_name] # expected
  
          # Shallow copy since we want the entire object heirarchy to start with.
          for (key, value) in six.iteritems(old_query):
              if value:
                  new_saved_query[query_attr_name][key] = value
  
          # Now, recursively overwrite any attributes passed in.
          SavedQueriesInterface._deep_update(new_saved_query, saved_query_attributes)
  
          return self.create(query_name, new_saved_query)
docs: Given a dict of attributes to be updated, update only those attributes
          in the Saved Query at the resource given by 'query_name'. This will
          perform two HTTP requests--one to fetch the query definition, and one
          to set the new attributes. This method will intend to preserve any
          other properties on the query.
  
          Master key must be set.