SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function multiply (children 1)
     ExpressionList (children 2)
      Function randConstant (children 1)
       ExpressionList (children 1)
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal UInt64_4
          Literal \'Nullable(UInt8)\'
      Literal UInt64_0