def default_value
      match = if definition =~ /timestamp|datetime/i
                /default '?(.+[^'])'?/i.match(definition)
              else
                /default '?(\w+)'?/i.match(definition)
              end

      return unless match

      match[1].downcase != 'null' ? match[1] : nil
    end
def default_value
      match = if definition =~ /timestamp|datetime/i
                /default '?(.+[^'])'?/i.match(definition)
              else
                /default '?(\w+)'?/i.match(definition)
              end

      return unless match

      match[1].downcase != 'null' ? match[1] : nil
    end
Gets the DEFAULT value the column takes as specified in the
 definition, if any

 @return [String, NilClass]