add_column_options!

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 499
      def add_column_options!(sql, options) #:nodoc:
        sql << " DEFAULT #{quote(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
      end