er of calls is anticipated, leveraging either the <i>Algebraic</i> or
 <i>Accumulator</i> interfaces is recommended. Pig normally handles this automatically.

 <p>Internally, this method presents the inner <b>Sketch Tuples</b> to a new <b>Union</b>.
 The result is returned as a <b>Sketch Tuple</b>

 <p>Types below are in the form: Java data type: Pig DataType

 <p><b>Input Tuple</b>
 <ul>
   <li>Tuple: TUPLE (Must contain only one field)
     <ul>
       <li>index 0: DataBag: BAG (May contain 0 or more Inne