override public void Assembly(Assembler asm)
 {
     asm.Begin(this);
     asm.SetFlag(Assembler.FLAG_HANA_CONCAT);
     asm.Add(LeftExpression);
     asm.AddSpace();
     asm.Add("||");
     asm.AddSpace();
     asm.Add(RightExpression);
     asm.ClearFlag(Assembler.FLAG_HANA_CONCAT);
     asm.End(this);
 }