AlterQuery  t_lwu_on_fly (children 3)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier a
     Literal UInt64_2
   ExpressionList (children 1)
    Assignment b (children 1)
     Literal UInt64_20
 Identifier t_lwu_on_fly
 Set
