code>exec</code>&nbsp;in class&nbsp;<code>org.apache.pig.EvalFunc&lt;org.apache.pig.data.Tuple&gt;</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>inputTuple</code> - A tuple containing a single bag, containing Sketch Tuples.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Sketch Tuple. If inputTuple is null or empty, returns empty sketch.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOExcep