SpecialUncategorizedpages.php

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<?php
class UncategorizedPagesPage extends PageQueryPage {
    protected $requestedNamespace = false;
 
    function __construct( $name = 'Uncategorizedpages' ) {
        parent::__construct( $name );
    }
 
    function sortDescending() {
        return false;
    }
 
    function isExpensive() {
        return true;
    }
 
    function isSyndicated() {
        return false;
    }
 
    function getQueryInfo() {
        return [
            'tables' => [ 'page', 'categorylinks' ],
            'fields' => [
                'namespace' => 'page_namespace',
                'title' => 'page_title',
            ],
            // default for page_namespace is all content namespaces (if requestedNamespace is false)
            // otherwise, page_namespace is requestedNamespace
            'conds' => [
                'cl_from IS NULL',
                'page_namespace' => $this->requestedNamespace !== false
                        ? $this->requestedNamespace
                        : MWNamespace::getContentNamespaces(),
                'page_is_redirect' => 0
            ],
            'join_conds' => [
                'categorylinks' => [ 'LEFT JOIN', 'cl_from = page_id' ]
            ]
        ];
    }
 
    function getOrderFields() {
        // For some crazy reason ordering by a constant
        // causes a filesort
        if ( $this->requestedNamespace === false && count( MWNamespace::getContentNamespaces() ) > 1 ) {
            return [ 'page_namespace', 'page_title' ];
        }
 
        return [ 'page_title' ];
    }
 
    protected function getGroupName() {
        return 'maintenance';
    }
}