SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function sum (children 1)
     ExpressionList (children 1)
      Function if (children 1)
       ExpressionList (children 3)
        Function materialize (children 1)
         ExpressionList (children 1)
          Literal UInt64_0
        Literal UInt64_1
        Literal UInt64_0
   Set
