title: Span columns in dynamic generated table angular 10
body: <p>I need to span some cells if next column contains &quot;null&quot; or &quot;&quot;; As on picture.
  <a href="https://i.stack.imgur.com/5eB7I.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5eB7I.png" alt="enter image description here" /></a></p>
  <p>I have transposed input data, so i need to transform it before creating table.
  And i dont know how to span columns in dynamic generated table.</p>
  <p>I provide a demo-code on stackblitz;
  I use angular-material package;</p>
  <p><a href="https://stackblitz.com/edit/angular-ivy-hknwsw?file=src%2Fapp%2Fapp.component.ts" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-ivy-hknwsw?file=src%2Fapp%2Fapp.component.ts</a></p>