title: How to get the correlation matrix of a pyspark data frame?
body: <p>I have a big pyspark data frame. I want to get its correlation matrix. I know how to get it with a pandas data frame.But my data is too big to convert to pandas. So I need to get the result with pyspark data frame.I searched other similar questions, the answers don't work for me.
  Can any body help me? thanks! </p>
  
  <p>Data example:
  <a href="https://i.stack.imgur.com/lTnF7.png" rel="noreferrer">data example</a></p>