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<pre>public&nbsp;org.apache.pig.data.Tuple&nbsp;exec(org.apache.pig.data.Tuple&nbsp;inputTuple)
                               throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Top-level exec function.
 This method accepts an input Tuple containing a Bag of one or more inner <b>Sketch Tuples</b>
 and returns a single <b>Sketch</b> as a <b>Sketch Tuple</b>.

 <p>If a large numb