title: Jasper reports rowspan dynamic data
body: <p>I'm a newbie in jasper reports. I have table like this:</p>
  
  <p><img src="https://i.stack.imgur.com/weln8.png" alt="enter image description here"></p>
  
  <p>You can see at row 1:
  c1, c2, c3 has duplicate value (AAA).
  And I wanna include three columns and the result will be like bellow:</p>
  
  <p><img src="https://i.stack.imgur.com/MQJtd.png" alt="enter image description here"></p>
  
  <p>I hope in this case you can help me.
  Thanks so much!</p>