code: function createQueryWithLimit() {
              // We query only limit number in case of big table
              // If we query with more than million data query will hang up
              const query = _this.initQuery(namespace);
              if (ancestors) {
                  query.hasAncestor(_this.gstore.ds.key(ancestors.slice()));
              }
              query.select('__key__');
              query.limit(limitDataPerQuery);
  
              return query;
          }
docs: ------------------------------------------------