title: Merging cells in an excel output in POI
body: <p>I am able to create the following excel using POI:</p>
  
  <p><img src="https://i.stack.imgur.com/33Tgb.jpg" alt="enter image description here"></p>
  
  <p>As clear from the image, each table is having two values viz. Val One and Val Two. </p>
  
  <p>However, I want the Table Name two cells to be merged into one cell in the first column as below:</p>
  
  <p><img src="https://i.stack.imgur.com/eV3Z1.jpg" alt="enter image description here"></p>
  
  <p>How to achieve this in POI ?</p>