Method transform_parent

datafusion/common/src/tree_node.rs:764–775

Maps the [`Transformed`] object to the result of the given `f` depending on the current [`TreeNodeRecursion`] value and the fact that `f` is changing the current node's parent.

(
        self,
        f: F,
    )

    /// current [`TreeNodeRecursion`] value and the fact that `f` is changing the current
    /// node's parent.
    pub fn transform_parent<F: FnOnce(T) -> Result<Transformed<T>>>(
        self,
        f: F,
    ) -> Result<Transformed<T>> {
        match self.tnr {
            TreeNodeRecursion::Continue => f(self.data).map(|mut t| {
                t.transformed |= self.transformed;
                t
            }),
            TreeNodeRecursion::Jump | TreeNodeRecursion::Stop => Ok(self),
        }
    }
}

/// [`TreeNodeContainer`] contains elements that a function can be applied on or mapped.