/**
  * Remap all ColumnReferences in this tree to be clones of the underlying expression.
  *
  * @return ValueNode The remapped expression tree.
  * @exception StandardException Thrown on error
  */
 public ValueNode remapColumnReferencesToExpressions() throws StandardException {
   javaNode = javaNode.remapColumnReferencesToExpressions();
   return this;
 }