title: Hive : Concat a map
body: <p>I have a small trouble into Hive, when I try to concatenate map</p>
  
  <p>Assume that I've something like that :</p>
  
  <pre><code>var 1 | var 2
  
  x | map(key1:value1)
  
  x | map(key2:value2)
  
  x | map(key3:value3)
  
  y | map(key4:value4)
  </code></pre>
  
  <p>What I'am trying to get, It's something like that </p>
  
  <pre><code>var 1 | var 2
  
  x | map(key1:value1 ; key2:value2; key3:value3)
  
  y | map(key4,value4)
  </code></pre>
  
  <p>Something like a map concatenation. </p>
  
  <p>How can I proceed whith Hive ?</p>