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 array(
            'tables' => array( 'page', 'categorylinks' ),
            'fields' => array(
                'namespace' => 'page_namespace',
                'title' => 'page_title',
                'value' => 'page_title'
            ),
            // default for page_namespace is all content namespaces (if requestedNamespace is false)
            // otherwise, page_namespace is requestedNamespace
            'conds' => array(
                'cl_from IS NULL',
                'page_namespace' => $this->requestedNamespace !== false
                        ? $this->requestedNamespace
                        : MWNamespace::getContentNamespaces(),
                'page_is_redirect' => 0
            ),
            'join_conds' => array(
                'categorylinks' => array( '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 array( 'page_namespace', 'page_title' );
        }

        return array( 'page_title' );
    }

    protected function getGroupName() {
        return 'maintenance';
    }
}