ass="line"><span class="cl"><span class="c1">// join data sets
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">val</span> <span class="n">germanVisits</span><span class="k">:</span> <span class="kt">DataSet</span><span class="o">[(</span><span class="kt">PageVisit</span>, <span class="kt">User</span><span class="o">)]</span> <span class="k">=</span>
</span></span><span class="line"><span class="cl">      <span class="c1">// equi-join condition (PageVisit.user