node.js – Google Datastore合并(联合)多组实体结果以实现OR条件

由于Datastore does not have support the OR operator的事实,我需要运行多个查询并结合结果.

我计划运行多个查询,然后将结果合并到一个实体对象数组中.我已经有一个查询工作了.

问题：合并数据存储区返回的两个(或多个)实体集合(包括重复数据删除)的合理有效方法是什么？我相信这将是一个集合论的“联合”运作.

以下是基本查询大纲,它将使用一些不同的过滤器多次运行,以实现所需的OR条件.

//Set requester username
  const requester = req.user.userName;
  //Create datastore query on Transfer request kind table
  const task_history = datastore.createQuery('Task');
  //Set query conditions
  task_history.filter('requester',requester);
  //Run datastore query
  datastore.runQuery(task_history,function(err,entities) {
    if(err) {
      console.log('Task History JSON unable to return data results. Error message: ',err);
      return;
      //If query works and returns any entities
    } else if (entities[0]) {
      //Else if query works but does not return any entities return empty JSON response
      res.json(entities); //HOW TO COMBINE (UNION) MULTIPLE SETS OF ENTITIES EFFICIENTLY?
      return;
    }
  });

这是我的原帖：Google Datastore filter with OR condition