extract_limit

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 94
        def extract_limit(sql_type)
          case sql_type
          when /^enum\((.+)\)/
            $1.split(',').map{|enum| enum.strip.length - 2}.max
          when /blob|text/
            case sql_type
            when /tiny/
              255
            when /medium/
              16777215
            when /long/
              2147483647 # mysql only allows 2^31-1, not 2^32-1, somewhat inconsistently with the tiny/medium/normal cases
            else
              super # we could return 65535 here, but we leave it undecorated by default
            end
          when /^bigint/;    8
          when /^int/;       4
          when /^mediumint/; 3
          when /^smallint/;  2
          when /^tinyint/;   1
          when /^float/;     24
          when /^double/;    53
          else
            super
          end
        end