MysqlUpdater.php

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<?php
use Wikimedia\Rdbms\MySQLField;
use Wikimedia\Rdbms\IDatabase;
use MediaWiki\MediaWikiServices;
 
class MysqlUpdater extends DatabaseUpdater {
    protected function getCoreUpdateList() {
        return [
            [ 'disableContentHandlerUseDB' ],
 
            // 1.2
            [ 'addField', 'ipblocks', 'ipb_id', 'patch-ipblocks.sql' ],
            [ 'addField', 'ipblocks', 'ipb_expiry', 'patch-ipb_expiry.sql' ],
            [ 'doInterwikiUpdate' ],
            [ 'doIndexUpdate' ],
            [ 'addField', 'recentchanges', 'rc_type', 'patch-rc_type.sql' ],
            [ 'addIndex', 'recentchanges', 'new_name_timestamp', 'patch-rc-newindex.sql' ],
 
            // 1.3
            [ 'addField', 'user', 'user_real_name', 'patch-user-realname.sql' ],
            [ 'addTable', 'querycache', 'patch-querycache.sql' ],
            [ 'addTable', 'objectcache', 'patch-objectcache.sql' ],
            [ 'addTable', 'categorylinks', 'patch-categorylinks.sql' ],
            [ 'doOldLinksUpdate' ],
            [ 'doFixAncientImagelinks' ],
            [ 'addField', 'recentchanges', 'rc_ip', 'patch-rc_ip.sql' ],
 
            // 1.4
            [ 'addIndex', 'image', 'PRIMARY', 'patch-image_name_primary.sql' ],
            [ 'addField', 'recentchanges', 'rc_id', 'patch-rc_id.sql' ],
            [ 'addField', 'recentchanges', 'rc_patrolled', 'patch-rc-patrol.sql' ],
            [ 'addTable', 'logging', 'patch-logging.sql' ],
            [ 'addField', 'user', 'user_token', 'patch-user_token.sql' ],
            [ 'addField', 'watchlist', 'wl_notificationtimestamp', 'patch-email-notification.sql' ],
            [ 'doWatchlistUpdate' ],
            [ 'dropField', 'user', 'user_emailauthenticationtimestamp',
                'patch-email-authentication.sql' ],
 
            // 1.5
            [ 'doSchemaRestructuring' ],
            [ 'addField', 'logging', 'log_params', 'patch-log_params.sql' ],
            [ 'checkBin', 'logging', 'log_title', 'patch-logging-title.sql', ],
            [ 'addField', 'archive', 'ar_rev_id', 'patch-archive-rev_id.sql' ],
            [ 'addField', 'page', 'page_len', 'patch-page_len.sql' ],
            [ 'dropField', 'revision', 'inverse_timestamp', 'patch-inverse_timestamp.sql' ],
            [ 'addField', 'revision', 'rev_text_id', 'patch-rev_text_id.sql' ],
            [ 'addField', 'revision', 'rev_deleted', 'patch-rev_deleted.sql' ],
            [ 'addField', 'image', 'img_width', 'patch-img_width.sql' ],
            [ 'addField', 'image', 'img_metadata', 'patch-img_metadata.sql' ],
            [ 'addField', 'user', 'user_email_token', 'patch-user_email_token.sql' ],
            [ 'addField', 'archive', 'ar_text_id', 'patch-archive-text_id.sql' ],
            [ 'doNamespaceSize' ],
            [ 'addField', 'image', 'img_media_type', 'patch-img_media_type.sql' ],
            [ 'doPagelinksUpdate' ],
            [ 'dropField', 'image', 'img_type', 'patch-drop_img_type.sql' ],
            [ 'doUserUniqueUpdate' ],
            [ 'doUserGroupsUpdate' ],
            [ 'addField', 'site_stats', 'ss_total_pages', 'patch-ss_total_articles.sql' ],
            [ 'addTable', 'user_newtalk', 'patch-usernewtalk.sql' ],
            [ 'addField', 'interwiki', 'iw_trans', 'patch-interwiki-trans.sql' ],
 
            // 1.6
            [ 'doWatchlistNull' ],
            [ 'addIndex', 'logging', 'times', 'patch-logging-times-index.sql' ],
            [ 'addField', 'ipblocks', 'ipb_range_start', 'patch-ipb_range_start.sql' ],
            [ 'doPageRandomUpdate' ],
            [ 'addField', 'user', 'user_registration', 'patch-user_registration.sql' ],
            [ 'doTemplatelinksUpdate' ],
            [ 'addTable', 'externallinks', 'patch-externallinks.sql' ],
            [ 'addTable', 'job', 'patch-job.sql' ],
            [ 'addField', 'site_stats', 'ss_images', 'patch-ss_images.sql' ],
            [ 'addTable', 'langlinks', 'patch-langlinks.sql' ],
            [ 'addTable', 'querycache_info', 'patch-querycacheinfo.sql' ],
            [ 'addTable', 'filearchive', 'patch-filearchive.sql' ],
            [ 'addField', 'ipblocks', 'ipb_anon_only', 'patch-ipb_anon_only.sql' ],
            [ 'addIndex', 'recentchanges', 'rc_ns_usertext', 'patch-recentchanges-utindex.sql' ],
            [ 'addIndex', 'recentchanges', 'rc_user_text', 'patch-rc_user_text-index.sql' ],
 
            // 1.9
            [ 'addField', 'user', 'user_newpass_time', 'patch-user_newpass_time.sql' ],
            [ 'addTable', 'redirect', 'patch-redirect.sql' ],
            [ 'addTable', 'querycachetwo', 'patch-querycachetwo.sql' ],
            [ 'addField', 'ipblocks', 'ipb_enable_autoblock', 'patch-ipb_optional_autoblock.sql' ],
            [ 'doBacklinkingIndicesUpdate' ],
            [ 'addField', 'recentchanges', 'rc_old_len', 'patch-rc_len.sql' ],
            [ 'addField', 'user', 'user_editcount', 'patch-user_editcount.sql' ],
 
            // 1.10
            [ 'doRestrictionsUpdate' ],
            [ 'addField', 'logging', 'log_id', 'patch-log_id.sql' ],
            [ 'addField', 'revision', 'rev_parent_id', 'patch-rev_parent_id.sql' ],
            [ 'addField', 'page_restrictions', 'pr_id', 'patch-page_restrictions_sortkey.sql' ],
            [ 'addField', 'revision', 'rev_len', 'patch-rev_len.sql' ],
            [ 'addField', 'recentchanges', 'rc_deleted', 'patch-rc_deleted.sql' ],
            [ 'addField', 'logging', 'log_deleted', 'patch-log_deleted.sql' ],
            [ 'addField', 'archive', 'ar_deleted', 'patch-ar_deleted.sql' ],
            [ 'addField', 'ipblocks', 'ipb_deleted', 'patch-ipb_deleted.sql' ],
            [ 'addField', 'filearchive', 'fa_deleted', 'patch-fa_deleted.sql' ],
            [ 'addField', 'archive', 'ar_len', 'patch-ar_len.sql' ],
 
            // 1.11
            [ 'addField', 'ipblocks', 'ipb_block_email', 'patch-ipb_emailban.sql' ],
            [ 'doCategorylinksIndicesUpdate' ],
            [ 'addField', 'oldimage', 'oi_metadata', 'patch-oi_metadata.sql' ],
            [ 'addIndex', 'archive', 'usertext_timestamp', 'patch-archive-user-index.sql' ],
            [ 'addIndex', 'image', 'img_usertext_timestamp', 'patch-image-user-index.sql' ],
            [ 'addIndex', 'oldimage', 'oi_usertext_timestamp', 'patch-oldimage-user-index.sql' ],
            [ 'addField', 'archive', 'ar_page_id', 'patch-archive-page_id.sql' ],
            [ 'addField', 'image', 'img_sha1', 'patch-img_sha1.sql' ],
 
            // 1.12
            [ 'addTable', 'protected_titles', 'patch-protected_titles.sql' ],
 
            // 1.13
            [ 'addField', 'ipblocks', 'ipb_by_text', 'patch-ipb_by_text.sql' ],
            [ 'addTable', 'page_props', 'patch-page_props.sql' ],
            [ 'addTable', 'updatelog', 'patch-updatelog.sql' ],
            [ 'addTable', 'category', 'patch-category.sql' ],
            [ 'doCategoryPopulation' ],
            [ 'addField', 'archive', 'ar_parent_id', 'patch-ar_parent_id.sql' ],
            [ 'addField', 'user_newtalk', 'user_last_timestamp', 'patch-user_last_timestamp.sql' ],
            [ 'doPopulateParentId' ],
            [ 'checkBin', 'protected_titles', 'pt_title', 'patch-pt_title-encoding.sql', ],
            [ 'doMaybeProfilingMemoryUpdate' ],
            [ 'doFilearchiveIndicesUpdate' ],
 
            // 1.14
            [ 'addField', 'site_stats', 'ss_active_users', 'patch-ss_active_users.sql' ],
            [ 'doActiveUsersInit' ],
            [ 'addField', 'ipblocks', 'ipb_allow_usertalk', 'patch-ipb_allow_usertalk.sql' ],
 
            // 1.15
            [ 'addTable', 'change_tag', 'patch-change_tag.sql' ],
 
            // 1.16
            [ 'addTable', 'user_properties', 'patch-user_properties.sql' ],
            [ 'addTable', 'log_search', 'patch-log_search.sql' ],
            [ 'addField', 'logging', 'log_user_text', 'patch-log_user_text.sql' ],
            # listed separately from the previous update because 1.16 was released without this update
            [ 'doLogUsertextPopulation' ],
            [ 'doLogSearchPopulation' ],
            [ 'addTable', 'l10n_cache', 'patch-l10n_cache.sql' ],
            [ 'dropIndex', 'change_tag', 'ct_rc_id', 'patch-change_tag-indexes.sql' ],
            [ 'addField', 'redirect', 'rd_interwiki', 'patch-rd_interwiki.sql' ],
            [ 'doUpdateMimeMinorField' ],
 
            // 1.17
            [ 'addTable', 'iwlinks', 'patch-iwlinks.sql' ],
            [ 'addIndex', 'iwlinks', 'iwl_prefix_title_from', 'patch-rename-iwl_prefix.sql' ],
            [ 'addField', 'updatelog', 'ul_value', 'patch-ul_value.sql' ],
            [ 'addField', 'interwiki', 'iw_api', 'patch-iw_api_and_wikiid.sql' ],
            [ 'dropIndex', 'iwlinks', 'iwl_prefix', 'patch-kill-iwl_prefix.sql' ],
            [ 'addField', 'categorylinks', 'cl_collation', 'patch-categorylinks-better-collation.sql' ],
            [ 'doClFieldsUpdate' ],
            [ 'addTable', 'module_deps', 'patch-module_deps.sql' ],
            [ 'dropIndex', 'archive', 'ar_page_revid', 'patch-archive_kill_ar_page_revid.sql' ],
            [ 'addIndexIfNoneExist',
                'archive', [ 'ar_revid', 'ar_revid_uniq' ], 'patch-archive_ar_revid.sql' ],
            [ 'doLangLinksLengthUpdate' ],
 
            // 1.18
            [ 'doUserNewTalkTimestampNotNull' ],
            [ 'addIndex', 'user', 'user_email', 'patch-user_email_index.sql' ],
            [ 'modifyField', 'user_properties', 'up_property', 'patch-up_property.sql' ],
            [ 'addTable', 'uploadstash', 'patch-uploadstash.sql' ],
            [ 'addTable', 'user_former_groups', 'patch-user_former_groups.sql' ],
 
            // 1.19
            [ 'addField', 'revision', 'rev_sha1', 'patch-rev_sha1.sql' ],
            [ 'doMigrateUserOptions' ],
            [ 'dropField', 'user', 'user_options', 'patch-drop-user_options.sql' ],
            [ 'addField', 'archive', 'ar_sha1', 'patch-ar_sha1.sql' ],
            [ 'addIndex', 'page', 'page_redirect_namespace_len',
                'patch-page_redirect_namespace_len.sql' ],
            [ 'addField', 'uploadstash', 'us_chunk_inx', 'patch-uploadstash_chunk.sql' ],
            [ 'addfield', 'job', 'job_timestamp', 'patch-jobs-add-timestamp.sql' ],
 
            // 1.20
            [ 'addIndex', 'revision', 'page_user_timestamp', 'patch-revision-user-page-index.sql' ],
            [ 'addField', 'ipblocks', 'ipb_parent_block_id', 'patch-ipb-parent-block-id.sql' ],
            [ 'addIndex', 'ipblocks', 'ipb_parent_block_id', 'patch-ipb-parent-block-id-index.sql' ],
            [ 'dropField', 'category', 'cat_hidden', 'patch-cat_hidden.sql' ],
 
            // 1.21
            [ 'addField', 'revision', 'rev_content_format', 'patch-revision-rev_content_format.sql' ],
            [ 'addField', 'revision', 'rev_content_model', 'patch-revision-rev_content_model.sql' ],
            [ 'addField', 'archive', 'ar_content_format', 'patch-archive-ar_content_format.sql' ],
            [ 'addField', 'archive', 'ar_content_model', 'patch-archive-ar_content_model.sql' ],
            [ 'addField', 'page', 'page_content_model', 'patch-page-page_content_model.sql' ],
            [ 'enableContentHandlerUseDB' ],
            [ 'dropField', 'site_stats', 'ss_admins', 'patch-drop-ss_admins.sql' ],
            [ 'dropField', 'recentchanges', 'rc_moved_to_title', 'patch-rc_moved.sql' ],
            [ 'addTable', 'sites', 'patch-sites.sql' ],
            [ 'addField', 'filearchive', 'fa_sha1', 'patch-fa_sha1.sql' ],
            [ 'addField', 'job', 'job_token', 'patch-job_token.sql' ],
            [ 'addField', 'job', 'job_attempts', 'patch-job_attempts.sql' ],
            [ 'doEnableProfiling' ],
            [ 'addField', 'uploadstash', 'us_props', 'patch-uploadstash-us_props.sql' ],
            [ 'modifyField', 'user_groups', 'ug_group', 'patch-ug_group-length-increase-255.sql' ],
            [ 'modifyField', 'user_former_groups', 'ufg_group',
                'patch-ufg_group-length-increase-255.sql' ],
            [ 'addIndex', 'page_props', 'pp_propname_page',
                'patch-page_props-propname-page-index.sql' ],
            [ 'addIndex', 'image', 'img_media_mime', 'patch-img_media_mime-index.sql' ],
 
            // 1.22
            [ 'doIwlinksIndexNonUnique' ],
            [ 'addIndex', 'iwlinks', 'iwl_prefix_from_title',
                'patch-iwlinks-from-title-index.sql' ],
            [ 'addField', 'archive', 'ar_id', 'patch-archive-ar_id.sql' ],
            [ 'addField', 'externallinks', 'el_id', 'patch-externallinks-el_id.sql' ],
 
            // 1.23
            [ 'addField', 'recentchanges', 'rc_source', 'patch-rc_source.sql' ],
            [ 'addIndex', 'logging', 'log_user_text_type_time',
                'patch-logging_user_text_type_time_index.sql' ],
            [ 'addIndex', 'logging', 'log_user_text_time', 'patch-logging_user_text_time_index.sql' ],
            [ 'addField', 'page', 'page_links_updated', 'patch-page_links_updated.sql' ],
            [ 'addField', 'user', 'user_password_expires', 'patch-user_password_expire.sql' ],
 
            // 1.24
            [ 'addField', 'page_props', 'pp_sortkey', 'patch-pp_sortkey.sql' ],
            [ 'dropField', 'recentchanges', 'rc_cur_time', 'patch-drop-rc_cur_time.sql' ],
            [ 'addIndex', 'watchlist', 'wl_user_notificationtimestamp',
                'patch-watchlist-user-notificationtimestamp-index.sql' ],
            [ 'addField', 'page', 'page_lang', 'patch-page_lang.sql' ],
            [ 'addField', 'pagelinks', 'pl_from_namespace', 'patch-pl_from_namespace.sql' ],
            [ 'addField', 'templatelinks', 'tl_from_namespace', 'patch-tl_from_namespace.sql' ],
            [ 'addField', 'imagelinks', 'il_from_namespace', 'patch-il_from_namespace.sql' ],
            [ 'modifyField', 'image', 'img_major_mime',
                'patch-img_major_mime-chemical.sql' ],
            [ 'modifyField', 'oldimage', 'oi_major_mime',
                'patch-oi_major_mime-chemical.sql' ],
            [ 'modifyField', 'filearchive', 'fa_major_mime',
                'patch-fa_major_mime-chemical.sql' ],
 
            // 1.25
            // note this patch covers other _comment and _description fields too
            [ 'doExtendCommentLengths' ],
 
            // 1.26
            [ 'dropTable', 'hitcounter' ],
            [ 'dropField', 'site_stats', 'ss_total_views', 'patch-drop-ss_total_views.sql' ],
            [ 'dropField', 'page', 'page_counter', 'patch-drop-page_counter.sql' ],
 
            // 1.27
            [ 'dropTable', 'msg_resource_links' ],
            [ 'dropTable', 'msg_resource' ],
            [ 'addTable', 'bot_passwords', 'patch-bot_passwords.sql' ],
            [ 'addField', 'watchlist', 'wl_id', 'patch-watchlist-wl_id.sql' ],
            [ 'dropIndex', 'categorylinks', 'cl_collation', 'patch-kill-cl_collation_index.sql' ],
            [ 'addIndex', 'categorylinks', 'cl_collation_ext',
                'patch-add-cl_collation_ext_index.sql' ],
            [ 'doCollationUpdate' ],
 
            // 1.28
            [ 'addIndex', 'recentchanges', 'rc_name_type_patrolled_timestamp',
                'patch-add-rc_name_type_patrolled_timestamp_index.sql' ],
            [ 'doRevisionPageRevIndexNonUnique' ],
            [ 'doNonUniquePlTlIl' ],
            [ 'addField', 'change_tag', 'ct_id', 'patch-change_tag-ct_id.sql' ],
            [ 'modifyField', 'recentchanges', 'rc_ip', 'patch-rc_ip_modify.sql' ],
            [ 'addIndex', 'archive', 'usertext_timestamp', 'patch-rename-ar_usertext_timestamp.sql' ],
 
            // 1.29
            [ 'addField', 'externallinks', 'el_index_60', 'patch-externallinks-el_index_60.sql' ],
            [ 'dropIndex', 'user_groups', 'ug_user_group', 'patch-user_groups-primary-key.sql' ],
            [ 'addField', 'user_groups', 'ug_expiry', 'patch-user_groups-ug_expiry.sql' ],
            [ 'addIndex', 'image', 'img_user_timestamp', 'patch-image-user-index-2.sql' ],
 
            // 1.30
            [ 'modifyField', 'image', 'img_media_type', 'patch-add-3d.sql' ],
            [ 'addTable', 'ip_changes', 'patch-ip_changes.sql' ],
            [ 'renameIndex', 'categorylinks', 'cl_from', 'PRIMARY', false,
                'patch-categorylinks-fix-pk.sql' ],
            [ 'renameIndex', 'templatelinks', 'tl_from', 'PRIMARY', false,
                'patch-templatelinks-fix-pk.sql' ],
            [ 'renameIndex', 'pagelinks', 'pl_from', 'PRIMARY', false, 'patch-pagelinks-fix-pk.sql' ],
            [ 'renameIndex', 'text', 'old_id', 'PRIMARY', false, 'patch-text-fix-pk.sql' ],
            [ 'renameIndex', 'imagelinks', 'il_from', 'PRIMARY', false, 'patch-imagelinks-fix-pk.sql' ],
            [ 'renameIndex', 'iwlinks', 'iwl_from', 'PRIMARY', false, 'patch-iwlinks-fix-pk.sql' ],
            [ 'renameIndex', 'langlinks', 'll_from', 'PRIMARY', false, 'patch-langlinks-fix-pk.sql' ],
            [ 'renameIndex', 'log_search', 'ls_field_val', 'PRIMARY', false, 'patch-log_search-fix-pk.sql' ],
            [ 'renameIndex', 'module_deps', 'md_module_skin', 'PRIMARY', false,
                'patch-module_deps-fix-pk.sql' ],
            [ 'renameIndex', 'objectcache', 'keyname', 'PRIMARY', false, 'patch-objectcache-fix-pk.sql' ],
            [ 'renameIndex', 'querycache_info', 'qci_type', 'PRIMARY', false,
                'patch-querycache_info-fix-pk.sql' ],
            [ 'renameIndex', 'site_stats', 'ss_row_id', 'PRIMARY', false, 'patch-site_stats-fix-pk.sql' ],
            [ 'renameIndex', 'user_former_groups', 'ufg_user_group', 'PRIMARY', false,
                'patch-user_former_groups-fix-pk.sql' ],
            [ 'renameIndex', 'user_properties', 'user_properties_user_property', 'PRIMARY', false,
                'patch-user_properties-fix-pk.sql' ],
            [ 'addTable', 'comment', 'patch-comment-table.sql' ],
            [ 'addTable', 'revision_comment_temp', 'patch-revision_comment_temp-table.sql' ],
            // image_comment_temp is no longer needed when upgrading to MW 1.31 or newer,
            // as it is dropped later in the update process as part of 'migrateImageCommentTemp'.
            // File kept on disk and the updater entry here for historical purposes.
            // [ 'addTable', 'image_comment_temp', 'patch-image_comment_temp-table.sql' ],
            [ 'addField', 'archive', 'ar_comment_id', 'patch-archive-ar_comment_id.sql' ],
            [ 'addField', 'filearchive', 'fa_description_id', 'patch-filearchive-fa_description_id.sql' ],
            [ 'modifyField', 'image', 'img_description', 'patch-image-img_description-default.sql' ],
            [ 'addField', 'ipblocks', 'ipb_reason_id', 'patch-ipblocks-ipb_reason_id.sql' ],
            [ 'addField', 'logging', 'log_comment_id', 'patch-logging-log_comment_id.sql' ],
            [ 'addField', 'oldimage', 'oi_description_id', 'patch-oldimage-oi_description_id.sql' ],
            [ 'addField', 'protected_titles', 'pt_reason_id', 'patch-protected_titles-pt_reason_id.sql' ],
            [ 'addField', 'recentchanges', 'rc_comment_id', 'patch-recentchanges-rc_comment_id.sql' ],
            [ 'modifyField', 'revision', 'rev_comment', 'patch-revision-rev_comment-default.sql' ],
 
            // This field was added in 1.31, but is put here so it can be used by 'migrateComments'
            [ 'addField', 'image', 'img_description_id', 'patch-image-img_description_id.sql' ],
 
            [ 'migrateComments' ],
            [ 'renameIndex', 'l10n_cache', 'lc_lang_key', 'PRIMARY', false,
                'patch-l10n_cache-primary-key.sql' ],
            [ 'doUnsignedSyncronisation' ],
 
            // 1.31
            [ 'addTable', 'slots', 'patch-slots.sql' ],
            [ 'addField', 'slots', 'slot_origin', 'patch-slot-origin.sql' ],
            [ 'addTable', 'content', 'patch-content.sql' ],
            [ 'addTable', 'slot_roles', 'patch-slot_roles.sql' ],
            [ 'addTable', 'content_models', 'patch-content_models.sql' ],
            [ 'migrateArchiveText' ],
            [ 'addTable', 'actor', 'patch-actor-table.sql' ],
            [ 'addTable', 'revision_actor_temp', 'patch-revision_actor_temp-table.sql' ],
            [ 'addField', 'archive', 'ar_actor', 'patch-archive-ar_actor.sql' ],
            [ 'addField', 'ipblocks', 'ipb_by_actor', 'patch-ipblocks-ipb_by_actor.sql' ],
            [ 'addField', 'image', 'img_actor', 'patch-image-img_actor.sql' ],
            [ 'addField', 'oldimage', 'oi_actor', 'patch-oldimage-oi_actor.sql' ],
            [ 'addField', 'filearchive', 'fa_actor', 'patch-filearchive-fa_actor.sql' ],
            [ 'addField', 'recentchanges', 'rc_actor', 'patch-recentchanges-rc_actor.sql' ],
            [ 'addField', 'logging', 'log_actor', 'patch-logging-log_actor.sql' ],
            [ 'migrateActors' ],
            [ 'modifyField', 'revision', 'rev_text_id', 'patch-rev_text_id-default.sql' ],
            [ 'modifyTable', 'site_stats', 'patch-site_stats-modify.sql' ],
            [ 'populateArchiveRevId' ],
            [ 'addIndex', 'recentchanges', 'rc_namespace_title_timestamp',
                'patch-recentchanges-nttindex.sql' ],
 
            // 1.32
            [ 'addTable', 'change_tag_def', 'patch-change_tag_def.sql' ],
            [ 'populateExternallinksIndex60' ],
            [ 'modifyfield', 'externallinks', 'el_index_60',
                'patch-externallinks-el_index_60-drop-default.sql' ],
            [ 'runMaintenance', DeduplicateArchiveRevId::class, 'maintenance/deduplicateArchiveRevId.php' ],
            [ 'addField', 'change_tag', 'ct_tag_id', 'patch-change_tag-tag_id.sql' ],
            [ 'addIndex', 'archive', 'ar_revid_uniq', 'patch-archive-ar_rev_id-unique.sql' ],
            [ 'populateContentTables' ],
            [ 'addIndex', 'logging', 'log_type_action', 'patch-logging-log-type-action-index.sql' ],
            [ 'dropIndex', 'logging', 'type_action', 'patch-logging-drop-type-action-index.sql' ],
            [ 'renameIndex', 'interwiki', 'iw_prefix', 'PRIMARY', false, 'patch-interwiki-fix-pk.sql' ],
            [ 'renameIndex', 'page_props', 'pp_page_propname', 'PRIMARY', false,
                'patch-page_props-fix-pk.sql' ],
            [ 'renameIndex', 'protected_titles', 'pt_namespace_title', 'PRIMARY', false,
                'patch-protected_titles-fix-pk.sql' ],
            [ 'renameIndex', 'site_identifiers', 'site_ids_type', 'PRIMARY', false,
                'patch-site_identifiers-fix-pk.sql' ],
            [ 'addIndex', 'recentchanges', 'rc_this_oldid', 'patch-recentchanges-rc_this_oldid-index.sql' ],
            [ 'dropTable', 'transcache' ],
            [ 'runMaintenance', PopulateChangeTagDef::class, 'maintenance/populateChangeTagDef.php' ],
            [ 'addIndex', 'change_tag', 'change_tag_rc_tag_id',
                'patch-change_tag-change_tag_rc_tag_id.sql' ],
            [ 'addField', 'ipblocks', 'ipb_sitewide', 'patch-ipb_sitewide.sql' ],
            [ 'addTable', 'ipblocks_restrictions', 'patch-ipblocks_restrictions-table.sql' ],
            [ 'migrateImageCommentTemp' ],
 
            // 1,33
            [ 'dropField', 'change_tag', 'ct_tag', 'patch-drop-ct_tag.sql' ],
            [ 'dropTable', 'valid_tag' ],
            [ 'dropTable', 'tag_summary' ],
            [ 'dropField', 'protected_titles', 'pt_reason', 'patch-drop-comment-fields.sql' ],
            [ 'modifyTable', 'job', 'patch-job-params-mediumblob.sql' ],
        ];
    }
 
    protected function checkBin( $table, $field, $patchFile ) {
        if ( !$this->doTable( $table ) ) {
            return true;
        }
 
        $fieldInfo = $this->db->fieldInfo( $table, $field );
        if ( $fieldInfo->isBinary() ) {
            $this->output( "...$table table has correct $field encoding.\n" );
        } else {
            $this->applyPatch( $patchFile, false, "Fixing $field encoding on $table table" );
        }
    }
 
    protected function indexHasField( $table, $index, $field ) {
        if ( !$this->doTable( $table ) ) {
            return true;
        }
 
        $info = $this->db->indexInfo( $table, $index, __METHOD__ );
        if ( $info ) {
            foreach ( $info as $row ) {
                if ( $row->Column_name == $field ) {
                    $this->output( "...index $index on table $table includes field $field.\n" );
 
                    return true;
                }
            }
        }
        $this->output( "...index $index on table $table has no field $field; added.\n" );
 
        return false;
    }
 
    protected function doInterwikiUpdate() {
        global $IP;
 
        if ( !$this->doTable( 'interwiki' ) ) {
            return;
        }
 
        if ( $this->db->tableExists( "interwiki", __METHOD__ ) ) {
            $this->output( "...already have interwiki table\n" );
 
            return;
        }
 
        $this->applyPatch( 'patch-interwiki.sql', false, 'Creating interwiki table' );
        $this->applyPatch(
            "$IP/maintenance/interwiki.sql",
            true,
            'Adding default interwiki definitions'
        );
    }
 
    protected function doIndexUpdate() {
        $meta = $this->db->fieldInfo( 'recentchanges', 'rc_timestamp' );
        if ( $meta === false ) {
            throw new MWException( 'Missing rc_timestamp field of recentchanges table. Should not happen.' );
        }
        if ( $meta->isMultipleKey() ) {
            $this->output( "...indexes seem up to 20031107 standards.\n" );
 
            return;
        }
 
        $this->applyPatch( 'patch-indexes.sql', true, "Updating indexes to 20031107" );
    }
 
    protected function doOldLinksUpdate() {
        $cl = $this->maintenance->runChild( ConvertLinks::class );
        $cl->execute();
    }
 
    protected function doFixAncientImagelinks() {
        $info = $this->db->fieldInfo( 'imagelinks', 'il_from' );
        if ( !$info || $info->type() !== 'string' ) {
            $this->output( "...il_from OK\n" );
 
            return;
        }
 
        $applied = $this->applyPatch(
            'patch-fix-il_from.sql',
            false,
            'Fixing ancient broken imagelinks table.'
        );
 
        if ( $applied ) {
            $this->output( "NOTE: you will have to run maintenance/refreshLinks.php after this." );
        }
    }
 
    function doWatchlistUpdate() {
        $talk = $this->db->selectField( 'watchlist', 'count(*)', 'wl_namespace & 1', __METHOD__ );
        $nontalk = $this->db->selectField(
            'watchlist',
            'count(*)',
            'NOT (wl_namespace & 1)',
            __METHOD__
        );
        if ( $talk == $nontalk ) {
            $this->output( "...watchlist talk page rows already present.\n" );
 
            return;
        }
 
        $insertOpts = [ 'IGNORE' ];
        $selectOpts = [];
 
        // If wl_id exists, make insertSelect() more replication-safe by
        // ordering on that column. If not, hint that it should be safe anyway.
        if ( $this->db->fieldExists( 'watchlist', 'wl_id', __METHOD__ ) ) {
            $selectOpts['ORDER BY'] = 'wl_id';
        } else {
            $insertOpts[] = 'NO_AUTO_COLUMNS';
        }
 
        $this->output( "Adding missing watchlist talk page rows... " );
        $this->db->insertSelect( 'watchlist', 'watchlist',
            [
                'wl_user' => 'wl_user',
                'wl_namespace' => 'wl_namespace | 1',
                'wl_title' => 'wl_title',
                'wl_notificationtimestamp' => 'wl_notificationtimestamp'
            ], [ 'NOT (wl_namespace & 1)' ], __METHOD__, $insertOpts, $selectOpts );
        $this->output( "done.\n" );
 
        $this->output( "Adding missing watchlist subject page rows... " );
        $this->db->insertSelect( 'watchlist', 'watchlist',
            [
                'wl_user' => 'wl_user',
                'wl_namespace' => 'wl_namespace & ~1',
                'wl_title' => 'wl_title',
                'wl_notificationtimestamp' => 'wl_notificationtimestamp'
            ], [ 'wl_namespace & 1' ], __METHOD__, $insertOpts, $selectOpts );
        $this->output( "done.\n" );
    }
 
    function doSchemaRestructuring() {
        if ( $this->db->tableExists( 'page', __METHOD__ ) ) {
            $this->output( "...page table already exists.\n" );
 
            return;
        }
 
        $this->output( "...converting from cur/old to page/revision/text DB structure.\n" );
        $this->output( wfTimestamp( TS_DB ) );
        $this->output( "......checking for duplicate entries.\n" );
 
        list( $cur, $old, $page, $revision, $text ) = $this->db->tableNamesN(
            'cur',
            'old',
            'page',
            'revision',
            'text'
        );
 
        $rows = $this->db->query( "
            SELECT cur_title, cur_namespace, COUNT(cur_namespace) AS c
            FROM $cur
            GROUP BY cur_title, cur_namespace
            HAVING c>1",
            __METHOD__
        );
 
        if ( $rows->numRows() > 0 ) {
            $this->output( wfTimestamp( TS_DB ) );
            $this->output( "......<b>Found duplicate entries</b>\n" );
            $this->output( sprintf( "<b>      %-60s %3s %5s</b>\n", 'Title', 'NS', 'Count' ) );
            $duplicate = [];
            foreach ( $rows as $row ) {
                if ( !isset( $duplicate[$row->cur_namespace] ) ) {
                    $duplicate[$row->cur_namespace] = [];
                }
 
                $duplicate[$row->cur_namespace][] = $row->cur_title;
                $this->output( sprintf(
                    "      %-60s %3s %5s\n",
                    $row->cur_title, $row->cur_namespace,
                    $row->c
                ) );
            }
            $sql = "SELECT cur_title, cur_namespace, cur_id, cur_timestamp FROM $cur WHERE ";
            $dupeTitles = [];
            foreach ( $duplicate as $ns => $titles ) {
                $dupeTitles[] = "( cur_namespace = {$ns} AND cur_title in ("
                    . $this->db->makeList( $titles ) . ") ) \n";
            }
            $sql .= $this->db->makeList( $dupeTitles, IDatabase::LIST_OR );
            # By sorting descending, the most recent entry will be the first in the list.
            # All following entries will be deleted by the next while-loop.
            $sql .= 'ORDER BY cur_namespace, cur_title, cur_timestamp DESC';
 
            $rows = $this->db->query( $sql, __METHOD__ );
 
            $prev_title = $prev_namespace = false;
            $deleteId = [];
 
            foreach ( $rows as $row ) {
                if ( $prev_title == $row->cur_title && $prev_namespace == $row->cur_namespace ) {
                    $deleteId[] = (int)$row->cur_id;
                }
                $prev_title = $row->cur_title;
                $prev_namespace = $row->cur_namespace;
            }
            $sql = "DELETE FROM $cur WHERE cur_id IN ( " . implode( ',', $deleteId ) . ')';
            $this->db->query( $sql, __METHOD__ );
            $this->output( wfTimestamp( TS_DB ) );
            $this->output( "......<b>Deleted</b> " . $this->db->affectedRows() . " records.\n" );
        }
 
        $this->output( wfTimestamp( TS_DB ) );
        $this->output( "......Creating tables.\n" );
        $this->db->query( "CREATE TABLE $page (
            page_id int(8) unsigned NOT NULL auto_increment,
            page_namespace int NOT NULL,
            page_title varchar(255) binary NOT NULL,
            page_restrictions tinyblob NOT NULL,
            page_is_redirect tinyint(1) unsigned NOT NULL default '0',
            page_is_new tinyint(1) unsigned NOT NULL default '0',
            page_random real unsigned NOT NULL,
            page_touched char(14) binary NOT NULL default '',
            page_latest int(8) unsigned NOT NULL,
            page_len int(8) unsigned NOT NULL,
 
            PRIMARY KEY page_id (page_id),
            UNIQUE INDEX name_title (page_namespace,page_title),
            INDEX (page_random),
            INDEX (page_len)
            ) ENGINE=InnoDB", __METHOD__ );
        $this->db->query( "CREATE TABLE $revision (
            rev_id int(8) unsigned NOT NULL auto_increment,
            rev_page int(8) unsigned NOT NULL,
            rev_comment tinyblob NOT NULL,
            rev_user int(5) unsigned NOT NULL default '0',
            rev_user_text varchar(255) binary NOT NULL default '',
            rev_timestamp char(14) binary NOT NULL default '',
            rev_minor_edit tinyint(1) unsigned NOT NULL default '0',
            rev_deleted tinyint(1) unsigned NOT NULL default '0',
            rev_len int(8) unsigned,
            rev_parent_id int(8) unsigned default NULL,
            PRIMARY KEY rev_page_id (rev_page, rev_id),
            UNIQUE INDEX rev_id (rev_id),
            INDEX rev_timestamp (rev_timestamp),
            INDEX page_timestamp (rev_page,rev_timestamp),
            INDEX user_timestamp (rev_user,rev_timestamp),
            INDEX usertext_timestamp (rev_user_text,rev_timestamp)
            ) ENGINE=InnoDB", __METHOD__ );
 
        $this->output( wfTimestamp( TS_DB ) );
        $this->output( "......Locking tables.\n" );
        $this->db->query(
            "LOCK TABLES $page WRITE, $revision WRITE, $old WRITE, $cur WRITE",
            __METHOD__
        );
 
        $maxold = intval( $this->db->selectField( 'old', 'max(old_id)', '', __METHOD__ ) );
        $this->output( wfTimestamp( TS_DB ) );
        $this->output( "......maxold is {$maxold}\n" );
 
        $this->output( wfTimestamp( TS_DB ) );
        global $wgLegacySchemaConversion;
        if ( $wgLegacySchemaConversion ) {
            // Create HistoryBlobCurStub entries.
            // Text will be pulled from the leftover 'cur' table at runtime.
            $this->output( "......Moving metadata from cur; using blob references to text in cur table.\n" );
            $cur_text = "concat('O:18:\"historyblobcurstub\":1:{s:6:\"mCurId\";i:',cur_id,';}')";
            $cur_flags = "'object'";
        } else {
            // Copy all cur text in immediately: this may take longer but avoids
            // having to keep an extra table around.
            $this->output( "......Moving text from cur.\n" );
            $cur_text = 'cur_text';
            $cur_flags = "''";
        }
        $this->db->query(
            "INSERT INTO $old (old_namespace, old_title, old_text, old_comment, old_user,
                old_user_text, old_timestamp, old_minor_edit, old_flags)
            SELECT cur_namespace, cur_title, $cur_text, cur_comment, cur_user, cur_user_text,
                cur_timestamp, cur_minor_edit, $cur_flags
            FROM $cur",
            __METHOD__
        );
 
        $this->output( wfTimestamp( TS_DB ) );
        $this->output( "......Setting up revision table.\n" );
        $this->db->query(
            "INSERT INTO $revision (rev_id, rev_page, rev_comment, rev_user,
                rev_user_text, rev_timestamp, rev_minor_edit)
            SELECT old_id, cur_id, old_comment, old_user, old_user_text,
                old_timestamp, old_minor_edit
            FROM $old,$cur WHERE old_namespace=cur_namespace AND old_title=cur_title",
            __METHOD__
        );
 
        $this->output( wfTimestamp( TS_DB ) );
        $this->output( "......Setting up page table.\n" );
        $this->db->query(
            "INSERT INTO $page (page_id, page_namespace, page_title,
                page_restrictions, page_is_redirect, page_is_new, page_random,
                page_touched, page_latest, page_len)
            SELECT cur_id, cur_namespace, cur_title, cur_restrictions,
                cur_is_redirect, cur_is_new, cur_random, cur_touched, rev_id, LENGTH(cur_text)
            FROM $cur,$revision
            WHERE cur_id=rev_page AND rev_timestamp=cur_timestamp AND rev_id > {$maxold}",
            __METHOD__
        );
 
        $this->output( wfTimestamp( TS_DB ) );
        $this->output( "......Unlocking tables.\n" );
        $this->db->query( "UNLOCK TABLES", __METHOD__ );
 
        $this->output( wfTimestamp( TS_DB ) );
        $this->output( "......Renaming old.\n" );
        $this->db->query( "ALTER TABLE $old RENAME TO $text", __METHOD__ );
 
        $this->output( wfTimestamp( TS_DB ) );
        $this->output( "...done.\n" );
    }
 
    protected function doNamespaceSize() {
        $tables = [
            'page' => 'page',
            'archive' => 'ar',
            'recentchanges' => 'rc',
            'watchlist' => 'wl',
            'querycache' => 'qc',
            'logging' => 'log',
        ];
        foreach ( $tables as $table => $prefix ) {
            $field = $prefix . '_namespace';
 
            $tablename = $this->db->tableName( $table );
            $result = $this->db->query( "SHOW COLUMNS FROM $tablename LIKE '$field'", __METHOD__ );
            $info = $this->db->fetchObject( $result );
 
            if ( substr( $info->Type, 0, 3 ) == 'int' ) {
                $this->output( "...$field is already a full int ($info->Type).\n" );
            } else {
                $this->output( "Promoting $field from $info->Type to int... " );
                $this->db->query( "ALTER TABLE $tablename MODIFY $field int NOT NULL", __METHOD__ );
                $this->output( "done.\n" );
            }
        }
    }
 
    protected function doPagelinksUpdate() {
        if ( $this->db->tableExists( 'pagelinks', __METHOD__ ) ) {
            $this->output( "...already have pagelinks table.\n" );
 
            return;
        }
 
        $this->applyPatch(
            'patch-pagelinks.sql',
            false,
            'Converting links and brokenlinks tables to pagelinks'
        );
 
        foreach (
            MediaWikiServices::getInstance()->getContentLanguage()->getNamespaces() as $ns => $name
        ) {
            if ( $ns == 0 ) {
                continue;
            }
 
            $this->output( "Cleaning up broken links for namespace $ns... " );
            $this->db->update( 'pagelinks',
                [
                    'pl_namespace' => $ns,
                    "pl_title = TRIM(LEADING {$this->db->addQuotes( "$name:" )} FROM pl_title)",
                ],
                [
                    'pl_namespace' => 0,
                    'pl_title' . $this->db->buildLike( "$name:", $this->db->anyString() ),
                ],
                __METHOD__
            );
            $this->output( "done.\n" );
        }
    }
 
    protected function doUserUniqueUpdate() {
        if ( !$this->doTable( 'user' ) ) {
            return true;
        }
 
        $duper = new UserDupes( $this->db, [ $this, 'output' ] );
        if ( $duper->hasUniqueIndex() ) {
            $this->output( "...already have unique user_name index.\n" );
 
            return;
        }
 
        if ( !$duper->clearDupes() ) {
            $this->output( "WARNING: This next step will probably fail due to unfixed duplicates...\n" );
        }
        $this->applyPatch( 'patch-user_nameindex.sql', false, "Adding unique index on user_name" );
    }
 
    protected function doUserGroupsUpdate() {
        if ( !$this->doTable( 'user_groups' ) ) {
            return true;
        }
 
        if ( $this->db->tableExists( 'user_groups', __METHOD__ ) ) {
            $info = $this->db->fieldInfo( 'user_groups', 'ug_group' );
            if ( $info->type() == 'int' ) {
                $oldug = $this->db->tableName( 'user_groups' );
                $newug = $this->db->tableName( 'user_groups_bogus' );
                $this->output( "user_groups table exists but is in bogus intermediate " .
                    "format. Renaming to $newug... " );
                $this->db->query( "ALTER TABLE $oldug RENAME TO $newug", __METHOD__ );
                $this->output( "done.\n" );
 
                $this->applyPatch( 'patch-user_groups.sql', false, "Re-adding fresh user_groups table" );
 
                $this->output( "***\n" );
                $this->output( "*** WARNING: You will need to manually fix up user " .
                    "permissions in the user_groups\n" );
                $this->output( "*** table. Old 1.5 alpha versions did some pretty funky stuff...\n" );
                $this->output( "***\n" );
            } else {
                $this->output( "...user_groups table exists and is in current format.\n" );
            }
 
            return;
        }
 
        $this->applyPatch( 'patch-user_groups.sql', false, "Adding user_groups table" );
 
        if ( !$this->db->tableExists( 'user_rights', __METHOD__ ) ) {
            if ( $this->db->fieldExists( 'user', 'user_rights', __METHOD__ ) ) {
                $this->applyPatch(
                    'patch-user_rights.sql',
                    false,
                    'Upgrading from a 1.3 or older database? Breaking out user_rights for conversion'
                );
            } else {
                $this->output( "*** WARNING: couldn't locate user_rights table or field for upgrade.\n" );
                $this->output( "*** You may need to manually configure some sysops by manipulating\n" );
                $this->output( "*** the user_groups table.\n" );
 
                return;
            }
        }
 
        $this->output( "Converting user_rights table to user_groups... " );
        $result = $this->db->select( 'user_rights',
            [ 'ur_user', 'ur_rights' ],
            [ "ur_rights != ''" ],
            __METHOD__ );
 
        foreach ( $result as $row ) {
            $groups = array_unique(
                array_map( 'trim',
                    explode( ',', $row->ur_rights ) ) );
 
            foreach ( $groups as $group ) {
                $this->db->insert( 'user_groups',
                    [
                        'ug_user' => $row->ur_user,
                        'ug_group' => $group ],
                    __METHOD__ );
            }
        }
        $this->output( "done.\n" );
    }
 
    protected function doWatchlistNull() {
        $info = $this->db->fieldInfo( 'watchlist', 'wl_notificationtimestamp' );
        if ( !$info ) {
            return;
        }
        if ( $info->isNullable() ) {
            $this->output( "...wl_notificationtimestamp is already nullable.\n" );
 
            return;
        }
 
        $this->applyPatch(
            'patch-watchlist-null.sql',
            false,
            'Making wl_notificationtimestamp nullable'
        );
    }
 
    protected function doPageRandomUpdate() {
        $page = $this->db->tableName( 'page' );
        $this->db->query( "UPDATE $page SET page_random = RAND() WHERE page_random = 0", __METHOD__ );
        $rows = $this->db->affectedRows();
 
        if ( $rows ) {
            $this->output( "Set page_random to a random value on $rows rows where it was set to 0\n" );
        } else {
            $this->output( "...no page_random rows needed to be set\n" );
        }
    }
 
    protected function doTemplatelinksUpdate() {
        if ( $this->db->tableExists( 'templatelinks', __METHOD__ ) ) {
            $this->output( "...templatelinks table already exists\n" );
 
            return;
        }
 
        $this->applyPatch( 'patch-templatelinks.sql', false, "Creating templatelinks table" );
 
        $this->output( "Populating...\n" );
        $services = MediaWikiServices::getInstance();
        if ( $services->getDBLoadBalancer()->getServerCount() > 1 ) {
            // Slow, replication-friendly update
            $res = $this->db->select( 'pagelinks', [ 'pl_from', 'pl_namespace', 'pl_title' ],
                [ 'pl_namespace' => NS_TEMPLATE ], __METHOD__ );
            $count = 0;
            foreach ( $res as $row ) {
                $count = ( $count + 1 ) % 100;
                if ( $count == 0 ) {
                    $lbFactory = $services->getDBLoadBalancerFactory();
                    $lbFactory->waitForReplication( [
                        'domain' => $lbFactory->getLocalDomainID(),
                        'timeout' => self::REPLICATION_WAIT_TIMEOUT
                    ] );
                }
                $this->db->insert( 'templatelinks',
                    [
                        'tl_from' => $row->pl_from,
                        'tl_namespace' => $row->pl_namespace,
                        'tl_title' => $row->pl_title,
                    ], __METHOD__
                );
            }
        } else {
            // Fast update
            $this->db->insertSelect( 'templatelinks', 'pagelinks',
                [
                    'tl_from' => 'pl_from',
                    'tl_namespace' => 'pl_namespace',
                    'tl_title' => 'pl_title'
                ], [
                    'pl_namespace' => 10
                ], __METHOD__,
                [ 'NO_AUTO_COLUMNS' ] // There's no "tl_id" auto-increment field
            );
        }
        $this->output( "Done. Please run maintenance/refreshLinks.php for a more " .
            "thorough templatelinks update.\n" );
    }
 
    protected function doBacklinkingIndicesUpdate() {
        if ( !$this->indexHasField( 'pagelinks', 'pl_namespace', 'pl_from' ) ||
            !$this->indexHasField( 'templatelinks', 'tl_namespace', 'tl_from' ) ||
            !$this->indexHasField( 'imagelinks', 'il_to', 'il_from' )
        ) {
            $this->applyPatch( 'patch-backlinkindexes.sql', false, "Updating backlinking indices" );
        }
    }
 
    protected function doRestrictionsUpdate() {
        if ( $this->db->tableExists( 'page_restrictions', __METHOD__ ) ) {
            $this->output( "...page_restrictions table already exists.\n" );
 
            return;
        }
 
        $this->applyPatch(
            'patch-page_restrictions.sql',
            false,
            'Creating page_restrictions table (1/2)'
        );
        $this->applyPatch(
            'patch-page_restrictions_sortkey.sql',
            false,
            'Creating page_restrictions table (2/2)'
        );
        $this->output( "done.\n" );
 
        $this->output( "Migrating old restrictions to new table...\n" );
        $task = $this->maintenance->runChild( UpdateRestrictions::class );
        $task->execute();
    }
 
    protected function doCategorylinksIndicesUpdate() {
        if ( !$this->indexHasField( 'categorylinks', 'cl_sortkey', 'cl_from' ) ) {
            $this->applyPatch( 'patch-categorylinksindex.sql', false, "Updating categorylinks Indices" );
        }
    }
 
    protected function doCategoryPopulation() {
        if ( $this->updateRowExists( 'populate category' ) ) {
            $this->output( "...category table already populated.\n" );
 
            return;
        }
 
        $this->output(
            "Populating category table, printing progress markers. " .
            "For large databases, you\n" .
            "may want to hit Ctrl-C and do this manually with maintenance/\n" .
            "populateCategory.php.\n"
        );
        $task = $this->maintenance->runChild( PopulateCategory::class );
        $task->execute();
        $this->output( "Done populating category table.\n" );
    }
 
    protected function doPopulateParentId() {
        if ( !$this->updateRowExists( 'populate rev_parent_id' ) ) {
            $this->output(
                "Populating rev_parent_id fields, printing progress markers. For large\n" .
                "databases, you may want to hit Ctrl-C and do this manually with\n" .
                "maintenance/populateParentId.php.\n" );
 
            $task = $this->maintenance->runChild( PopulateParentId::class );
            $task->execute();
        }
    }
 
    protected function doMaybeProfilingMemoryUpdate() {
        if ( !$this->doTable( 'profiling' ) ) {
            return true;
        }
 
        if ( !$this->db->tableExists( 'profiling', __METHOD__ ) ) {
            return true;
        } elseif ( $this->db->fieldExists( 'profiling', 'pf_memory', __METHOD__ ) ) {
            $this->output( "...profiling table has pf_memory field.\n" );
 
            return true;
        }
 
        return $this->applyPatch(
            'patch-profiling-memory.sql',
            false,
            'Adding pf_memory field to table profiling'
        );
    }
 
    protected function doFilearchiveIndicesUpdate() {
        $info = $this->db->indexInfo( 'filearchive', 'fa_user_timestamp', __METHOD__ );
        if ( !$info ) {
            $this->applyPatch( 'patch-filearchive-user-index.sql', false, "Updating filearchive indices" );
        }
 
        return true;
    }
 
    protected function doNonUniquePlTlIl() {
        $info = $this->db->indexInfo( 'pagelinks', 'pl_namespace' );
        if ( is_array( $info ) && $info[0]->Non_unique ) {
            $this->output( "...pl_namespace, tl_namespace, il_to indices are already non-UNIQUE.\n" );
 
            return true;
        }
        if ( $this->skipSchema ) {
            $this->output( "...skipping schema change (making pl_namespace, tl_namespace " .
                "and il_to indices non-UNIQUE).\n" );
 
            return false;
        }
 
        return $this->applyPatch(
            'patch-pl-tl-il-nonunique.sql',
            false,
            'Making pl_namespace, tl_namespace and il_to indices non-UNIQUE'
        );
    }
 
    protected function doUpdateMimeMinorField() {
        if ( $this->updateRowExists( 'mime_minor_length' ) ) {
            $this->output( "...*_mime_minor fields are already long enough.\n" );
 
            return;
        }
 
        $this->applyPatch(
            'patch-mime_minor_length.sql',
            false,
            'Altering all *_mime_minor fields to 100 bytes in size'
        );
    }
 
    protected function doClFieldsUpdate() {
        if ( $this->updateRowExists( 'cl_fields_update' ) ) {
            $this->output( "...categorylinks up-to-date.\n" );
 
            return;
        }
 
        $this->applyPatch(
            'patch-categorylinks-better-collation2.sql',
            false,
            'Updating categorylinks (again)'
        );
    }
 
    protected function doLangLinksLengthUpdate() {
        $langlinks = $this->db->tableName( 'langlinks' );
        $res = $this->db->query( "SHOW COLUMNS FROM $langlinks LIKE 'll_lang'" );
        $row = $this->db->fetchObject( $res );
 
        if ( $row && $row->Type == "varbinary(10)" ) {
            $this->applyPatch(
                'patch-langlinks-ll_lang-20.sql',
                false,
                'Updating length of ll_lang in langlinks'
            );
        } else {
            $this->output( "...ll_lang is up-to-date.\n" );
        }
    }
 
    protected function doUserNewTalkTimestampNotNull() {
        if ( !$this->doTable( 'user_newtalk' ) ) {
            return true;
        }
 
        $info = $this->db->fieldInfo( 'user_newtalk', 'user_last_timestamp' );
        if ( $info === false ) {
            return;
        }
        if ( $info->isNullable() ) {
            $this->output( "...user_last_timestamp is already nullable.\n" );
 
            return;
        }
 
        $this->applyPatch(
            'patch-user-newtalk-timestamp-null.sql',
            false,
            'Making user_last_timestamp nullable'
        );
    }
 
    protected function doIwlinksIndexNonUnique() {
        $info = $this->db->indexInfo( 'iwlinks', 'iwl_prefix_title_from' );
        if ( is_array( $info ) && $info[0]->Non_unique ) {
            $this->output( "...iwl_prefix_title_from index is already non-UNIQUE.\n" );
 
            return true;
        }
        if ( $this->skipSchema ) {
            $this->output( "...skipping schema change (making iwl_prefix_title_from index non-UNIQUE).\n" );
 
            return false;
        }
 
        return $this->applyPatch(
            'patch-iwl_prefix_title_from-non-unique.sql',
            false,
            'Making iwl_prefix_title_from index non-UNIQUE'
        );
    }
 
    protected function doUnsignedSyncronisation() {
        $sync = [
            [ 'table' => 'bot_passwords', 'field' => 'bp_user' ],
            [ 'table' => 'change_tag', 'field' => 'ct_log_id' ],
            [ 'table' => 'change_tag', 'field' => 'ct_rev_id' ],
            [ 'table' => 'page_restrictions', 'field' => 'pr_user' ],
            [ 'table' => 'user_newtalk', 'field' => 'user_id' ],
            [ 'table' => 'user_properties', 'field' => 'up_user' ],
        ];
 
        foreach ( $sync as $s ) {
            if ( !$this->doTable( $s['table'] ) ) {
                continue;
            }
 
            $info = $this->db->fieldInfo( $s['table'], $s['field'] );
            if ( $info === false ) {
                continue;
            }
            $fullName = "{$s['table']}.{$s['field']}";
            if ( $info->isUnsigned() ) {
                $this->output( "...$fullName is already unsigned int.\n" );
 
                continue;
            }
 
            $this->applyPatch(
                "patch-{$s['table']}-{$s['field']}-unsigned.sql",
                false,
                "Making $fullName into an unsigned int"
            );
        }
 
        return true;
    }
 
    protected function doRevisionPageRevIndexNonUnique() {
        if ( !$this->doTable( 'revision' ) ) {
            return true;
        } elseif ( !$this->db->indexExists( 'revision', 'rev_page_id' ) ) {
            $this->output( "...rev_page_id index not found on revision.\n" );
            return true;
        }
 
        if ( !$this->db->indexUnique( 'revision', 'rev_page_id' ) ) {
            $this->output( "...rev_page_id index already non-unique.\n" );
            return true;
        }
 
        return $this->applyPatch(
            'patch-revision-page-rev-index-nonunique.sql',
            false,
            'Making rev_page_id index non-unique'
        );
    }
 
    protected function doExtendCommentLengths() {
        $table = $this->db->tableName( 'revision' );
        $res = $this->db->query( "SHOW COLUMNS FROM $table LIKE 'rev_comment'" );
        $row = $this->db->fetchObject( $res );
 
        if ( $row && ( $row->Type !== "varbinary(767)" || $row->Default !== "" ) ) {
            $this->applyPatch(
                'patch-editsummary-length.sql',
                false,
                'Extending edit summary lengths (and setting defaults)'
            );
        } else {
            $this->output( "...comment fields are up to date.\n" );
        }
    }
 
    public function getSchemaVars() {
        global $wgDBTableOptions;
 
        $vars = [];
        $vars['wgDBTableOptions'] = str_replace( 'TYPE', 'ENGINE', $wgDBTableOptions );
        $vars['wgDBTableOptions'] = str_replace(
            'CHARSET=mysql4',
            'CHARSET=binary',
            $vars['wgDBTableOptions']
        );
 
        return $vars;
    }
}