SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function finalizeAggregation (children 1)
     ExpressionList (children 1)
      Function CAST (children 1)
       ExpressionList (children 2)
        Function unhex (children 1)
         ExpressionList (children 1)
          Literal \'01100000000000000000000000000000000001004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\'
        Literal \'AggregateFunction(topK(3), Tuple(UInt64, UInt64))\'
