public override TResult Accept <TResult>(SqlLiteralVisitor <TResult> visitor) => visitor.Visit(this);
 public override void Accept(SqlLiteralVisitor visitor) => visitor.Visit(this);
 public abstract TResult Accept <TResult>(SqlLiteralVisitor <TResult> visitor);
 public override TResult Accept <TResult>(SqlLiteralVisitor <TResult> visitor)
 {
     return(visitor.Visit(this));
 }
 public abstract void Accept(SqlLiteralVisitor visitor);