Ensure queries virtual attributes do not cause a crash

[etoundi2nd]

has_many with scoped declaring virtual attributes are rightfully not present in the columns_hash.
This causes the connected_through_array? to crash.

Setup to replicate the issue

# models/company.rb
has_many :companies_users
has_many :users, through: :companies_users

# models/companies_user.rb
belongs_to :user
belongs_to :company

# models/event.rb
has_many :companies, -> { polymorphic_company_scope }, primary_key: 'user_account_id', foreign_key: 'virtual_user_account_id' 

def self.polymorphic_company_scope
    companies_q = <<-SQL.squish
        SELECT
            companies.*,
            companies_users.user_id AS v_user_account_id
        FROM
            companies
            INNER JOIN companies_users ON companies.id = companies_users.company_id
    SQL

    -> { from("(#{ActiveRecord::Base.connection.quote_string(companies_q)}) companies") }
end

The virtual attribute virtual_user_account_id will cause the crash