title: How do I convert Dataframe to RDD in pyspark?
body: <p>I need to convert data frame to RDD and need to apply some core opertaions on it. 
  tried below things. its is converting into list,Row or tuple formats. but some of the core functions or not working on those like .split().</p>
  
  <p>tried below methods:</p>
  
  <pre><code>df.rdd.map(list)
  </code></pre>
  
  <p>or </p>
  
  <pre><code>df.rdd.map(tuple)
  </code></pre>
  
  <p>or</p>
  
  <pre><code>df.rdd
  </code></pre>
  
  <p>sample code i am trying</p>
  
  <pre><code>rdd=load_df.rdd.map(list)
  conv_rdd= rdd.map(lambda x:x.split(","))
  </code></pre>
  
  <p>need to perform some operations from here on</p>