in src/main/scala/org/apache/spark/sql/datasketches/theta/types/ThetaSketchWrapper.scala [34:39]
override def toString(): String = {
if (updateSketch.isDefined) return updateSketch.get.toString
else if (compactSketch.isDefined) return compactSketch.get.toString
else if (union.isDefined) return union.get.toString
"NULL"
}