最可靠的方法是定义自己的查询变量，然后进行检查：

$my_query = new WP_Query( array(
  ...
  \'context\' => \'my_query\'
) );

function alter_post_clauses( $clauses, $wp_query ) {
  if ( \'my_query\' == $wp_query->get( \'context\' ) ) {
    // do stuff
  }

  return $clauses;
}
add_filter( \'posts_clauses\', \'alter_post_clauses\', 10, 2 );