title: How to know which version of Hive am I using?
body: <p>I am new to running Hive queries.<br>
  I have a requirement to concatenate all the rows from a group by query into a single comma separated field.<br>
  There was an answer on stackoverflow showing that there is a limitation to do this based on the version of Hadoop, I am using.<br>
  So, I have two questions. </p>
  
  <ol>
  <li>How to know which version I am using? </li>
  <li>How to concatenate all rows into a single comma separated field based on Group by query? </li>
  </ol>