Debug WP_Query request

gistfile1.php

<?php

function debug_query() {
	add_filter('the_posts', '_debug_query', 10, 2);
}

function _debug_query($posts, $wp_query) {
	remove_filter( current_filter(), __FUNCTION__, 10, 2 );

	debug( $wp_query->request );

	return $posts;
}