SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function sumOrNull (children 1)
     ExpressionList (children 1)
      Function if (children 1)
       ExpressionList (children 3)
        Function materialize (children 1)
         ExpressionList (children 1)
          Literal UInt64_1
        Function toNullable (children 1)
         ExpressionList (children 1)
          Literal UInt64_1
        Literal UInt64_10
