Ji-Xinyou opened a new pull request, #1892:
URL: https://github.com/apache/incubator-opendal/pull/1892

   * Add `is_exist` operation to check whether the path exists, which is 
required in BDD tests.
   * Use a pointer to Rust `Vec` instead of the `original (data + len)` scheme, 
**the cost** is only heap-allocating the stack fields of Vector. This can make 
sure that the underlying buffer pointer is always valid since it can only be 
accessed through the APIs we give out.
     * This could also be a way to construct the map for init logic, i.e. use a 
pointer to `HashMap`


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