testcase.rb

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"
  gem "rails", github: "rails/rails"
  gem "arel", github: "rails/arel"
  gem "sqlite3"
end

require "active_record"
require "minitest/autorun"
require "logger"

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
    t.integer :some_property, default: nil  
  end
end

class Post < ActiveRecord::Base
end


class BugTest < Minitest::Test
  def test_association_stuff
    post = Post.create!

    assert_equal 1, Post.select("some_property IS NOT NULL AS with_property, id").limit(5).count # passes
    assert_equal 1, Post.select("id, some_property IS NOT NULL AS with_comment").limit(5).count # fails
  end
end