Nested include causes wrong sql on postgres when quoteIdentifiers is false

[topikachu]

What you are doing?

Post a minimal code sample that reproduces the issue, including models and associations

test('nested include (left outer join)', function () {
      var User = Support.sequelize.define('User', {
          name: DataTypes.STRING,
          age: DataTypes.INTEGER
        },
        {
          freezeTableName: true
        });
      var Post = Support.sequelize.define('Post', {
          title: DataTypes.STRING
        },
        {
          freezeTableName: true
        });
      var Comment = Support.sequelize.define('Comment', {
          title: DataTypes.STRING
        },
        {
          freezeTableName: true
        });

      User.Posts = User.hasMany(Post, {foreignKey: 'user_id'});
      Post.Comments = Post.hasMany(Comment, {foreignKey: 'post_id'});

      expectsql(sql.selectQuery('User', {
        attributes: ['name', 'age'],
        include: Model.$validateIncludedElements({
          include: [{
            attributes: ['title'],
            association: User.Posts,
            include: [
              {
                model: Comment
              }
            ]
          }],
          model: User
        }).include,
        model: User
      }, User), {
        default: 'SELECT [User].[name], [User].[age], [Posts].[id] AS [Posts.id], [Posts].[title] AS [Posts.title], [Posts.Comments].[id] AS [Posts.Comments.id], [Posts.Comments].[title] AS [Posts.Comments.title], [Posts.Comments].[createdAt] AS [Posts.Comments.createdAt], [Posts.Comments].[updatedAt] AS [Posts.Comments.updatedAt], [Posts.Comments].[post_id] AS [Posts.Comments.post_id] FROM [User] AS [User] LEFT OUTER JOIN [Post] AS [Posts] ON [User].[id] = [Posts].[user_id] LEFT OUTER JOIN [Comment] AS [Posts.Comments] ON [Posts].[id] = [Posts.Comments].[post_id];',
        postgres: 'SELECT User.name, User.age, Posts.id AS "Posts.id", Posts.title AS "Posts.title", "Posts.Comments".id AS "Posts.Comments.id", "Posts.Comments".title AS "Posts.Comments.title", "Posts.Comments".createdAt AS "Posts.Comments.createdAt", "Posts.Comments".updatedAt AS "Posts.Comments.updatedAt", "Posts.Comments".post_id AS "Posts.Comments.post_id" FROM User AS User LEFT OUTER JOIN Post AS Posts ON User.id = Posts.user_id LEFT OUTER JOIN Comment AS "Posts.Comments" ON Posts.id = "Posts.Comments".post_id;'
      });
    });

  });

What do you expect to happen?

The sql should generated as expecedt

What is actually happening?

SELECT 
User.name, 
User.age, Posts.id AS "Posts.id", 
Posts.title AS "Posts.title", 
Posts.Comments.id AS "Posts.Comments.id", #wrong
Posts.Comments.title AS "Posts.Comments.title",  #wrong
Posts.Comments.createdAt AS "Posts.Comments.createdAt", #wrong
Posts.Comments.updatedAt AS "Posts.Comments.updatedAt", #wrong
Posts.Comments.post_id AS "Posts.Comments.post_id" #wrong
FROM User AS User 
  LEFT OUTER JOIN Post AS Posts 
    ON User.id = Posts.user_id 
  LEFT OUTER JOIN Comment AS Posts.Comments #wrong
    ON Posts.id = Posts.Comments.post_id; 

The nested table alias has no quote.

Dialect: postgres
Database version: any
Sequelize version: 3.23.6