has_meta( int $postid )

function has_meta( $postid ) {
	global $wpdb;

	return $wpdb->get_results( $wpdb->prepare("SELECT meta_key, meta_value, meta_id, post_id
			FROM $wpdb->postmeta WHERE post_id = %d
			ORDER BY meta_key,meta_id", $postid), ARRAY_A );
}