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GraphQL streaming type?

I'm playing around with GraphQL-JS right now, wiring it up to a MariaDB backend.

I've figured out how to return an entire result set:

const queryType = new GraphQLObjectType({
    name: 'Query',
    fields: () => ({
        users: {
            type: new GraphQLList(userType),
            resolve: (root, args) => new Promise((resolve, reject) => {
                db.query('select * from users', (err, rows, fields) => {
                    if(err) return reject(err);
                    resolve(rows);
                });
            }),
        }
    })
});

Which is pretty cool, but the library I'm using also lets me stream results, row-by-row.

Does GraphQL have anything to facilitate this?

As far as I can tell, GraphQLList is expecting a full array, and I can only resolve my result set once, not feed using an Emitter or something.

How does Relay / GraphQL 'resolve' works?

I am trying out Relay and GraphQL. When I am doing the schema I am doing this:

let articleQLO = new GraphQLObjectType({
  name: 'Article',
  description: 'An article',
  fields: () => ({
    _id: globalIdField('Article'),
    title: {
      type: GraphQLString,
      description: 'The title of the article',
      resolve: (article) => article.getTitle(),
    },
    author: {
      type: userConnection,
      description: 'The author of the article',
      resolve: (article) => article.getAuthor(),
    },
  }),
  interfaces: [nodeInterface],
})

So, when I ask for an article like this:

{
  article(id: 1) {
    id,
    title,
    author
  }
}

Will it do 3 queries to the database? I mean, each field has a resolve method (getTitle, getAuthor...) which does a request to the database. Am I doing this wrong?

This is an example of getAuthor (I use mongoose):

articleSchema.methods.getAuthor = function(id){
  let article = this.model('Article').findOne({_id: id})
  return article.author
}