'CASE' value? ('WHEN' condition 'THEN' result)+ ('ELSE' result)? 'END'
Inheritance: PrimaryExpression
 public virtual void Visit(CaseWhenOperatorExpression node)
 {
     VisitInternal(node.Comparee);
     VisitInternal(node.ElseResult);
     VisitInternal(node.WhenList);
 }