Method destroy_carefully

src/expr/src/relation.rs:1947–1954

Clears the contents of `self` even if it's so deep that simply dropping it would cause a stack overflow in `drop_in_place`. Leaves `self` in an unusable state, so this should only be used if `self` is about to be dropped or otherwise overwritten.

(&mut self)

    /// Leaves `self` in an unusable state, so this should only be used if `self` is about to be
    /// dropped or otherwise overwritten.
    pub fn destroy_carefully(&mut self) {
        let mut todo = vec![self.take_dangerous()];
        while let Some(mut expr) = todo.pop() {
            for child in expr.children_mut() {
                todo.push(child.take_dangerous());
            }
        }
    }

    /// Computes the size (total number of nodes) and maximum depth of a MirRelationExpr for
    /// debug printing purposes.