title: Expand hash table without rehash?
body: <p>I am looking to for a <code>hash table</code> data structure that does not require <code>rehash</code> for expansion and shrink? 
  Rehash is a CPU consuming effort. I was wondering if it is possible to design hash table data structure in a way that does not require rehash at all? Have you heard about such a data structure before?</p>