title: How to concatenate arrays grouped by another column in Presto?
body: <p>Is this possible in SQL (preferably Presto):</p>
  
  <p>I want to reshape this table:</p>
  
  <pre><code>id, array
  1, ['something']
  1, ['something else']
  2, ['something']
  </code></pre>
  
  <p>To this table:</p>
  
  <pre><code>id, array
  1, ['something', 'something else']
  2, ['something']
  </code></pre>