关于红黑树的删除最小节点时的疑惑

在删除红黑树的最小节点时,为什么很多的代码都不需要处理最小节点(待删除)的右子节点,而是直接返回null,那其右子节点不就消失了吗?

  private Node deleteMin(Node x) {
        if (x.left == null) {
            return null;
        }
        if (!isRed(x.left) && !isRed(x.left.left)) {
            x = moveRedLeft(x);
        }
        x.left = deleteMin(x.left);
        return balance(x);
    }

    private Node moveRedLeft(Node x) {

        flipColors(x);

        if (isRed(x.right.left)) {
            x.right = rotateRight(x.right);
            x = rotateLeft(x);

            flipColors(x);
        }
        return x;
    }

https://blog.csdn.net/return_cc/article/details/79243450