'tables' => [ 'p1' => 'page', 'redirect', 'p2' => 'page' ],
'fields' => [ 'namespace' => 'p1.page_namespace',
'title' => 'p1.page_title',
'tables' => [ 'p1' => 'page', 'redirect', 'p2' => 'page' ],
'fields' => [ 'namespace' => 'p1.page_namespace',
'title' => 'p1.page_title',