SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Literal \'1M without 0\'
    Function length (children 1)
     ExpressionList (children 1)
      Function maxMerge (children 1)
       ExpressionList (children 1)
        Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function CAST (alias x) (children 1)
            ExpressionList (children 2)
             Function concat (children 1)
              ExpressionList (children 3)
               Function unhex (children 1)
                ExpressionList (children 1)
                 Literal \'00001000\'
               Function randomString (children 1)
                ExpressionList (children 1)
                 Function minus (children 1)
                  ExpressionList (children 2)
                   Literal UInt64_1048576
                   Literal UInt64_1
               Literal \'x\'
             Literal \'AggregateFunction(max, String)\'
