title: How to combine prediction with test frame
body: <p>The task to merge prediction frame to h2oframe containing features is not being done by merge method of water.rapids.Merge. </p>
  
  <p>How to use merge method to merge prediction's frame to features's frame and let me know the parameters description of this method, so method could be called properly?</p>
  
  <pre><code>merge(Frame leftFrame, Frame riteFrame, int[] leftCols, int[] riteCols, boolean allLeft, int[][] id_maps) 
  
  merge(Frame leftFrame, Frame riteFrame, int[] leftCols, int[] riteCols, boolean allLeft, int[][] id_maps, int[] ascendingL, int[] ascendingR) 
  </code></pre>
  
  <p>what are <code>int[][] id_maps</code>, <code>int[] leftCols</code>, <code>int[] riteCols</code> parameters?</p>
  
  <p>What is the right way to get merged frame of prediction's frame to features's frame?</p>