title: how to convert a String value to arrayType in pyspark
body: <p>I have a column like below in a <code>pyspark dataframe</code>, the type is String:</p>
  
  <p><a href="https://i.stack.imgur.com/zOskF.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zOskF.jpg" alt="enter image description here"></a></p>
  
  <p>Now I want to convert them to <code>ArrayType[Long]</code> , how can I do that?</p>