Defer Problem.summary on ProblemList

[quantum5]

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[Xyene]

For future reference, this query is another 50ms faster:

 SELECT `judge_problem`.`id`,
       `judge_problem`.`code`,
       `judge_problem`.`name`,
       `judge_problem`.`group_id`,
       `judge_problem`.`time_limit`,
       `judge_problem`.`memory_limit`,
       `judge_problem`.`short_circuit`,
       `judge_problem`.`points`,
       `judge_problem`.`partial`,
       `judge_problem`.`is_public`,
       `judge_problem`.`is_manually_managed`,
       `judge_problem`.`date`,
       `judge_problem`.`license_id`,
       `judge_problem`.`user_count`,
       `judge_problem`.`ac_rate`,
       `judge_problem`.`is_organization_private`,
       Coalesce(( judge_problemtranslation.name ), `judge_problem`.`name`) AS
       `i18n_name`,
       `judge_problemgroup`.`id`,
       `judge_problemgroup`.`name`,
       `judge_problemgroup`.`full_name`
FROM   `judge_problem`
       JOIN (SELECT DISTINCT `judge_problem`.`id`
             FROM   `judge_problem`
                    LEFT OUTER JOIN `judge_problem_authors`
                                 ON ( `judge_problem`.`id` =
                                      `judge_problem_authors`.`problem_id` )
                    LEFT OUTER JOIN `judge_problem_curators`
                                 ON ( `judge_problem`.`id` =
                                      `judge_problem_curators`.`problem_id` )
                    LEFT OUTER JOIN `judge_problem_testers`
                                 ON ( `judge_problem`.`id` =
                                      `judge_problem_testers`.`problem_id` )
             WHERE  ( `judge_problem`.`is_public` = 1
                       OR `judge_problem_authors`.`profile_id` = 2
                       OR `judge_problem_curators`.`profile_id` = 2
                       OR `judge_problem_testers`.`profile_id` = 2 )
             ORDER  BY `judge_problem`.`code` ASC
             LIMIT  50) top_50
         ON top_50.id = judge_problem.id
       LEFT OUTER JOIN `judge_problemtranslation`
                    ON ( `judge_problem`.`id` =
                         `judge_problemtranslation`.`problem_id`
                         AND ( `judge_problemtranslation`.`language` = 'en' ) )
       INNER JOIN `judge_problemgroup`
               ON ( `judge_problem`.`group_id` = `judge_problemgroup`.`id` );