uper</span><span class="tparams">[<span name="Z">Z</span>, <span name="X">X</span>, <span name="Y">Y</span>, <span name="T">T</span>]</span><span class="result"> extends AnyRef</span>
      </span>
      </h4>
      
      <div class="fullcommenttop" id="comment"><div class="comment cmt"><p>Helper class to do combine or transform after a groupBy
</p></div><div class="toggleContainer block">
          <span class="toggle">Linear Supertypes</span>
          <div class="superTypes hiddenContent">AnyRef, <span 