title: Merge dataframes without matching column
body: <p>I have the following two dataframes:</p>
  
  <pre><code>df1:
  column_01   value_01
  aaa         1
  bbb         2
  
  df2:
  column_02   value_02
  ccc         3
  ddd         4
  </code></pre>
  
  <p>I need to merge the dataframes such that the rows in <code>df1</code> are duplicated to contain a row for every row in <code>df2</code>. The output would be as follows:</p>
  
  <pre><code>column_01   value_01   column_02   value_02
  aaa         1          ccc         3
  aaa         1          ddd         4
  bbb         2          ccc         3
  bbb         2          ddd         4
  </code></pre>
  
  <p>I have tried variations of <code>merge</code> and <code>join</code>, but can't get it working because I am not matching column values, I am purposely trying to duplicate <code>df1</code> rows for each <code>df2</code> row.</p>