Method is_volatile

datafusion/expr/src/expr.rs:2149–2152

Returns true if the expression is volatile, i.e. whether it can return different results when evaluated multiple times with the same input. For example the function call `RANDOM()` is volatile as each call will return a different value. See [`Volatility`] for more information.

(&self)

    ///
    /// See [`Volatility`] for more information.
    pub fn is_volatile(&self) -> bool {
        self.exists(|expr| Ok(expr.is_volatile_node()))
            .expect("exists closure is infallible")
    }

    /// Recursively find all [`Expr::Placeholder`] expressions, and
    /// to infer their [`DataType`] from the context of their use.