SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function length (children 1)
     ExpressionList (children 1)
      Function arrayWithConstant (children 1)
       ExpressionList (children 2)
        Literal UInt64_10000000
        Function materialize (children 1)
         ExpressionList (children 1)
          Literal Array_[Array_[Array_[Array_[Array_[Array_[Array_[Array_[Array_[Array_[\'Hello world\']]]]]]]]]]
