The above error comes from:
cumin2024@db1192.eqiad.wmnet[wikidatawiki]> explain SELECT rev_id,rev_page,rev_actor,actor_rev_user.actor_user AS `rev_user`,actor_rev_user.actor_name AS `rev_user_text`,rev_timestamp,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,comment_rev_comment.comment_text AS `rev_comment_text`,comment_rev_comment.comment_data AS `rev_comment_data`,comment_rev_comment.comment_id AS `rev_comment_cid`,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name,page_is_new,(SELECT GROUP_CONCAT(ctd_name SEPARATOR ',') FROM `change_tag` JOIN `change_tag_def` ON ((ct_tag_id=ctd_id)) WHERE (ct_rev_id=rev_id) ) AS `ts_tags`,ores_damaging_cls.oresc_probability AS `ores_damaging_score`,0.385 AS `ores_damaging_threshold` FROM `revision` FORCE INDEX (rev_actor_timestamp) JOIN `actor` `actor_rev_user` ON ((actor_rev_user.actor_id = rev_actor)) JOIN `comment` `comment_rev_comment` ON ((comment_rev_comment.comment_id = rev_comment_id)) JOIN `page` ON ((page_id = rev_page)) LEFT JOIN `user` ON ((actor_rev_user.actor_user != 0) AND (user_id = actor_rev_user.actor_user)) LEFT JOIN `ores_classification` `ores_damaging_cls` ON (ores_damaging_cls.oresc_model = 11 AND (ores_damaging_cls.oresc_rev=rev_id) AND ores_damaging_cls.oresc_class = 1) WHERE actor_name = 'Jarekt' AND (page_namespace = 1) AND ((rev_deleted & 4) = 0) ORDER BY rev_timestamp DESC,rev_id DESC LIMIT 51 ; +------+--------------------+---------------------+--------+----------------------------+-----------------------+---------+------------------------------------------+---------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+--------------------+---------------------+--------+----------------------------+-----------------------+---------+------------------------------------------+---------+-------------+ | 1 | PRIMARY | actor_rev_user | const | PRIMARY,actor_name | actor_name | 257 | const | 1 | | | 1 | PRIMARY | user | const | PRIMARY | PRIMARY | 4 | const | 1 | | | 1 | PRIMARY | revision | ref | rev_actor_timestamp | rev_actor_timestamp | 8 | const | 2300078 | Using where | | 1 | PRIMARY | page | eq_ref | PRIMARY,page_name_title | PRIMARY | 4 | wikidatawiki.revision.rev_page | 1 | Using where | | 1 | PRIMARY | ores_damaging_cls | eq_ref | oresc_rev_model_class | oresc_rev_model_class | 7 | wikidatawiki.revision.rev_id,const,const | 1 | | | 1 | PRIMARY | comment_rev_comment | eq_ref | PRIMARY | PRIMARY | 8 | wikidatawiki.revision.rev_comment_id | 1 | | | 2 | DEPENDENT SUBQUERY | change_tag | ref | ct_rev_tag_id,ct_tag_id_id | ct_rev_tag_id | 5 | wikidatawiki.revision.rev_id | 1 | Using index | | 2 | DEPENDENT SUBQUERY | change_tag_def | eq_ref | PRIMARY | PRIMARY | 4 | wikidatawiki.change_tag.ct_tag_id | 1 | | +------+--------------------+---------------------+--------+----------------------------+-----------------------+---------+------------------------------------------+---------+-------------+ 8 rows in set (0.002 sec)