MysqlUpdater.php

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<?php
use Wikimedia\Rdbms\MySQLField;
 
class MysqlUpdater extends DatabaseUpdater {
    protected function getCoreUpdateList() {
        return [
            // 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' ],
            [ 'ifTableNotExists', 'actor', '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' ],
            [ 'ifTableNotExists', 'actor',
                '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' ],
            [ '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' ],
            [ 'setDefault', 'revision', 'rev_comment', '' ],
 
            // 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' ],
 
            // Adds a default value to the rev_text_id field to allow Multi Content
            // Revisions migration to happen where rows will have to be added to the
            // revision table with no rev_text_id.
            [ 'setDefault', 'revision', 'rev_text_id', 0 ],
            [ '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' ],
            [ 'dropDefault', 'externallinks', 'el_index_60' ],
            [ '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' ],
            [ 'dropIndex', 'change_tag', 'change_tag_rc_tag', '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', 'archive', 'ar_comment', 'patch-archive-drop-ar_comment.sql' ],
            [ 'dropField', 'ipblocks', 'ipb_reason', 'patch-ipblocks-drop-ipb_reason.sql' ],
            [ 'dropField', 'image', 'img_description', 'patch-image-drop-img_description.sql' ],
            [ 'dropField', 'oldimage', 'oi_description', 'patch-oldimage-drop-oi_description.sql' ],
            [ 'dropField', 'filearchive', 'fa_description', 'patch-filearchive-drop-fa_description.sql' ],
            [ 'dropField', 'recentchanges', 'rc_comment', 'patch-recentchanges-drop-rc_comment.sql' ],
            [ 'dropField', 'logging', 'log_comment', 'patch-logging-drop-log_comment.sql' ],
            [ 'dropField', 'protected_titles', 'pt_reason', 'patch-protected_titles-drop-pt_reason.sql' ],
            [ 'modifyTable', 'job', 'patch-job-params-mediumblob.sql' ],
 
            // 1.34
            [ 'dropIndex', 'archive', 'ar_usertext_timestamp',
                'patch-drop-archive-ar_usertext_timestamp.sql' ],
            [ 'dropIndex', 'archive', 'usertext_timestamp', 'patch-drop-archive-usertext_timestamp.sql' ],
            [ 'dropField', 'archive', 'ar_user', 'patch-drop-archive-user-fields.sql' ],
            [ 'dropField', 'ipblocks', 'ip_by', 'patch-drop-ipblocks-user-fields.sql' ],
            [ 'dropIndex', 'image', 'img_user_timestamp', 'patch-drop-image-img_user_timestamp.sql' ],
            [ 'dropField', 'image', 'img_user', 'patch-drop-image-user-fields.sql' ],
            [ 'dropField', 'oldimage', 'oi_user', 'patch-drop-oldimage-user-fields.sql' ],
            [ 'dropField', 'filearchive', 'fa_user', 'patch-drop-filearchive-user-fields.sql' ],
            [ 'dropField', 'recentchanges', 'rc_user', 'patch-drop-recentchanges-user-fields.sql' ],
            [ 'dropField', 'logging', 'log_user', 'patch-drop-logging-user-fields.sql' ],
            [ 'addIndex', 'user_newtalk', 'un_user_ip', 'patch-rename-mysql-user_newtalk-indexes.sql' ],
 
            // 1.35
            [ 'addTable', 'watchlist_expiry', 'patch-watchlist_expiry.sql' ],
            [ 'modifyField', 'page', 'page_restrictions', 'patch-page_restrictions-null.sql' ],
            [ 'renameIndex', 'ipblocks', 'ipb_address', 'ipb_address_unique', false,
                'patch-ipblocks-rename-ipb_address.sql' ],
            [ 'addField', 'revision', 'rev_actor', 'patch-revision-actor-comment-MCR.sql' ],
            [ 'dropField', 'archive', 'ar_text_id', 'patch-archive-MCR.sql' ],
            [ 'doLanguageLinksLengthSync' ],
            [ 'doFixIpbAddressUniqueIndex' ],
            [ 'modifyField', 'actor', 'actor_name', 'patch-actor-actor_name-varbinary.sql' ],
            [ 'modifyField', 'sites', 'site_global_key', 'patch-sites-site_global_key.sql' ],
            [ 'modifyField', 'iwlinks', 'iwl_prefix', 'patch-extend-iwlinks-iwl_prefix.sql' ],
 
            // 1.36
            [ 'modifyField', 'redirect', 'rd_title', 'patch-redirect-rd_title-varbinary.sql' ],
            [ 'modifyField', 'pagelinks', 'pl_title', 'patch-pagelinks-pl_title-varbinary.sql' ],
            [ 'modifyField', 'templatelinks', 'tl_title', 'patch-templatelinks-tl_title-varbinary.sql' ],
            [ 'modifyField', 'imagelinks', 'il_to', 'patch-imagelinks-il_to-varbinary.sql' ],
            [ 'modifyField', 'langlinks', 'll_title', 'patch-langlinks-ll_title-varbinary.sql' ],
            [ 'modifyField', 'iwlinks', 'iwl_title', 'patch-iwlinks-iwl_title-varbinary.sql' ],
            [ 'modifyField', 'category', 'cat_title', 'patch-category-cat_title-varbinary.sql' ],
            [ 'modifyField', 'querycache', 'qc_title', 'patch-querycache-qc_title-varbinary.sql' ],
            [ 'modifyField', 'querycachetwo', 'qcc_title', 'patch-querycachetwo-qcc_title-varbinary.sql' ],
            [ 'modifyField', 'watchlist', 'wl_title', 'patch-watchlist-wl_title-varbinary.sql' ],
            [ 'modifyField', 'user_newtalk', 'user_last_timestamp',
                'patch-user_newtalk-user_last_timestamp-binary.sql'
            ],
            [ 'modifyField', 'protected_titles', 'pt_title', 'patch-protected_titles-pt_title-varbinary.sql' ],
            [ 'dropDefault', 'protected_titles', 'pt_expiry' ],
            [ 'dropDefault', 'ip_changes', 'ipc_rev_timestamp' ],
            [ 'dropDefault', 'revision_actor_temp', 'revactor_timestamp' ],
            [ 'modifyField', 'ipblocks_restrictions', 'ir_type', 'patch-ipblocks_restrictions-ir_type.sql' ],
            [ 'renameIndex', 'watchlist', 'namespace_title', 'wl_namespace_title', false,
                'patch-watchlist-namespace_title-rename-index.sql' ],
            [ 'modifyField', 'job', 'job_title', 'patch-job-job_title-varbinary.sql' ],
            [ 'modifyField', 'job', 'job_timestamp', 'patch-job_job_timestamp.sql' ],
            [ 'modifyField', 'job', 'job_token_timestamp', 'patch-job_job_token_timestamp.sql' ],
            [ 'modifyField', 'watchlist', 'wl_notificationtimestamp', 'patch-watchlist-wl_notificationtimestamp.sql' ],
            [ 'modifyField', 'slot_roles', 'role_id', 'patch-slot_roles-role_id.sql' ],
            [ 'modifyField', 'content_models', 'model_id', 'patch-content_models-model_id.sql' ],
            [ 'modifyField', 'categorylinks', 'cl_to', 'patch-categorylinks-cl_to-varbinary.sql' ],
            [ 'modifyField', 'logging', 'log_title', 'patch-logging-log_title-varbinary.sql' ],
            [ 'modifyField', 'uploadstash', 'us_timestamp', 'patch-uploadstash-us_timestamp.sql' ],
            [ 'renameIndex', 'user_properties', 'user_properties_property', 'up_property', false,
                'patch-user_properties-rename-index.sql' ],
            [ 'renameIndex', 'sites', 'sites_global_key', 'site_global_key', false, 'patch-sites-rename-indexes.sql' ],
            [ 'renameIndex', 'logging', 'type_time', 'log_type_time', false, 'patch-logging-rename-indexes.sql' ],
            [ 'modifyField', 'filearchive', 'fa_name', 'patch-filearchive-fa_name.sql' ],
            [ 'dropDefault', 'filearchive', 'fa_deleted_timestamp' ],
            [ 'dropDefault', 'filearchive', 'fa_timestamp' ],
            [ 'modifyField', 'oldimage', 'oi_name', 'patch-oldimage-oi_name-varbinary.sql' ],
            [ 'dropDefault', 'oldimage', 'oi_timestamp' ],
            [ 'modifyField', 'objectcache', 'exptime', 'patch-objectcache-exptime-notnull.sql' ],
            [ 'dropDefault', 'ipblocks', 'ipb_timestamp' ],
            [ 'dropDefault', 'ipblocks', 'ipb_expiry' ],
            [ 'renameIndex', 'archive', 'name_title_timestamp', 'ar_name_title_timestamp', false,
                'patch-archive-rename-name_title_timestamp-index.sql' ],
            [ 'modifyField', 'image', 'img_name', 'patch-image-img_name-varbinary.sql' ],
            [ 'dropDefault', 'image', 'img_timestamp' ],
            [ 'modifyField', 'image', 'img_timestamp', 'patch-image-img_timestamp.sql' ],
            [ 'renameIndex', 'site_identifiers', 'site_ids_key', 'si_key', false,
                'patch-site_identifiers-rename-indexes.sql' ],
            [ 'modifyField', 'recentchanges', 'rc_title', 'patch-recentchanges-rc_title-varbinary.sql' ],
            [ 'dropDefault', 'recentchanges', 'rc_timestamp' ],
            [ 'modifyField', 'recentchanges', 'rc_timestamp', 'patch-recentchanges-rc_timestamp.sql' ],
            [ 'modifyField', 'recentchanges', 'rc_id', 'patch-recentchanges-rc_id.sql' ],
            [ 'renameIndex', 'recentchanges', 'new_name_timestamp', 'rc_new_name_timestamp', false,
                'patch-recentchanges-rc_new_name_timestamp.sql' ],
            [ 'dropDefault', 'archive', 'ar_timestamp' ],
            [ 'modifyField', 'archive', 'ar_title', 'patch-archive-ar_title-varbinary.sql' ],
            [ 'modifyField', 'page', 'page_title', 'patch-page-page_title-varbinary.sql' ],
            [ 'dropDefault', 'page', 'page_touched' ],
            [ 'modifyField', 'user', 'user_name', 'patch-user_table-updates.sql' ],
 
            // 1.37
            [ 'renameIndex', 'revision', 'page_timestamp', 'rev_page_timestamp', false,
                'patch-revision-rename-index.sql' ],
            [ 'addField', 'objectcache', 'modtoken', 'patch-objectcache-modtoken.sql' ],
            [ 'dropDefault', 'revision', 'rev_timestamp' ],
            [ 'addIndex', 'oldimage', 'oi_timestamp', 'patch-oldimage-oi_timestamp.sql' ],
            [ 'renameIndex', 'page', 'name_title', 'page_name_title', false, 'patch-page-rename-name_title-index.sql' ],
            [ 'renameIndex', 'change_tag', 'change_tag_rc_tag_id', 'ct_rc_tag_id', false,
                'patch-change_tag-rename-indexes.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 ) {
        $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 doNonUniquePlTlIl() {
        $info = $this->db->indexInfo( 'pagelinks', 'pl_namespace', __METHOD__ );
        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 doLanguageLinksLengthSync() {
        $sync = [
            [ 'table' => 'l10n_cache', 'field' => 'lc_lang', 'file' => 'patch-l10n_cache-lc_lang-35.sql' ],
            [ 'table' => 'langlinks', 'field' => 'll_lang', 'file' => 'patch-langlinks-ll_lang-35.sql' ],
            [ 'table' => 'sites', 'field' => 'site_language', 'file' => 'patch-sites-site_language-35.sql' ],
        ];
 
        foreach ( $sync as $s ) {
            $table = $this->db->tableName( $s['table'] );
            $field = $s['field'];
            $res = $this->db->query( "SHOW COLUMNS FROM $table LIKE '$field'", __METHOD__ );
            $row = $this->db->fetchObject( $res );
 
            if ( $row && $row->Type !== "varbinary(35)" ) {
                $this->applyPatch(
                    $s['file'],
                    false,
                    "Updating length of $field in $table"
                );
            } else {
                $this->output( "...$field is up-to-date.\n" );
            }
        }
    }
 
    protected function doFixIpbAddressUniqueIndex() {
        if ( !$this->doTable( 'ipblocks' ) ) {
            return;
        }
 
        if ( !$this->indexHasField( 'ipblocks', 'ipb_address_unique', 'ipb_anon_only' ) ) {
            $this->output( "...ipb_address_unique index up-to-date.\n" );
            return;
        }
 
        $this->applyPatch(
            'patch-ipblocks-fix-ipb_address_unique.sql',
            false,
            'Removing ipb_anon_only column from ipb_address_unique index'
        );
    }
 
    protected function doUnsignedSyncronisation() {
        $sync = [
            [ 'table' => 'bot_passwords', 'field' => 'bp_user', 'file' => 'patch-bot_passwords-bp_user-unsigned.sql' ],
            [ 'table' => 'change_tag', 'field' => 'ct_log_id', 'file' => 'patch-change_tag-ct_log_id-unsigned.sql' ],
            [ 'table' => 'change_tag', 'field' => 'ct_rev_id', 'file' => 'patch-change_tag-ct_rev_id-unsigned.sql' ],
            [ 'table' => 'page_restrictions', 'field' => 'pr_user',
                'file' => 'patch-page_restrictions-pr_user-unsigned.sql' ],
            [ 'table' => 'user_newtalk', 'field' => 'user_id', 'file' => 'patch-user_newtalk-user_id-unsigned.sql' ],
            [ 'table' => 'user_properties', 'field' => 'up_user',
                'file' => 'patch-user_properties-up_user-unsigned.sql' ],
            [ 'table' => 'change_tag', 'field' => 'ct_rc_id', 'file' => 'patch-change_tag-ct_rc_id-unsigned.sql' ]
        ];
 
        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(
                $s['file'],
                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', __METHOD__ ) ) {
            $this->output( "...rev_page_id index not found on revision.\n" );
            return true;
        }
 
        if ( !$this->db->indexUnique( 'revision', 'rev_page_id', __METHOD__ ) ) {
            $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'
        );
    }
 
    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;
    }
 
    protected function dropDefault( $table, $field ) {
        $updateKey = "$table-$field-dropDefault";
 
        if ( $this->updateRowExists( $updateKey ) ) {
            return;
        }
 
        $info = $this->db->fieldInfo( $table, $field );
        if ( $info && $info->defaultValue() !== false ) {
            $this->output( "Removing '$table.$field' default value.\n" );
            $table = $this->db->tableName( $table );
            $ret = $this->db->query( "ALTER TABLE $table ALTER COLUMN $field DROP DEFAULT", __METHOD__ );
 
            if ( $ret ) {
                $this->insertUpdateRow( $updateKey );
            }
        }
    }
 
    protected function setDefault( $table, $field, $default ) {
        $info = $this->db->fieldInfo( $table, $field );
        if ( $info && $info->defaultValue() !== $default ) {
            $this->output( "Changing '$table.$field' default value.\n" );
            $table = $this->db->tableName( $table );
            $this->db->query(
                "ALTER TABLE $table ALTER COLUMN $field SET DEFAULT "
                . $this->db->addQuotes( $default ), __METHOD__
            );
        }
    }
 
}