/** * Calculates the square root of a positive number and returns the result as * a double. * * The argument can be any valid expression as long as it resolves to a * non-negative number. * * @see https://docs.mongodb.org/manual/reference/operator/aggregation/sqrt/ * @see Expr::sqrt * @param mixed|Expr $expression * @return self */ public function sqrt($expression) { $this->expr->sqrt($expression); return $this; }