class ActiveRecord::ConnectionAdapters::SchemaCreation

def add_column_options!(sql, options)
  sql << " DEFAULT #{quote_default_expression(options[:default], options[:column])}" if options_include_default?(options)
  # must explicitly check for :null to allow change_column to work on migrations
  if options[:null] == false
    sql << " NOT NULL"
  end
  if options[:auto_increment] == true
    sql << " AUTO_INCREMENT"
  end
  if options[:primary_key] == true
    sql << " PRIMARY KEY"
  end
  sql
end