public static function get_rating_counts_for_product( &$product ) {
		global $wpdb;

		$counts     = array();
		$raw_counts = $wpdb->get_results(
			$wpdb->prepare(
				"
			SELECT meta_value, COUNT( * ) as meta_value_count FROM $wpdb->commentmeta
			LEFT JOIN $wpdb->comments ON $wpdb->commentmeta.comment_id = $wpdb->comments.comment_ID
			WHERE meta_key = 'rating'
			AND comment_post_ID = %d
			AND comment_approved = '1'
			AND meta_value > 0
			GROUP BY meta_value
				",
				$product->get_id()
			)
		);

		foreach ( $raw_counts as $count ) {
			$counts[ $count->meta_value ] = absint( $count->meta_value_count ); // WPCS: slow query ok.
		}

		return $counts;
	}