title: Filtering spark dataframe options
body: <p>I am looking at two different dataframe filterings, and i cannot see the difference in what they do:</p>
  
  <p>Option 1:</p>
  
  <pre><code>df.filter(df.col("myColumn").equalTo("test"))
  </code></pre>
  
  <p>Option 2:</p>
  
  <pre><code>df.filter(col("myColumn").equalTo("test"))
  </code></pre>
  
  <p>Is there a difference between getting the <code>Column</code> object from the instanciated dataframe vs just using the <code>col</code> function from sparks sql framework?</p>