SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Literal \'-2\'
    Function maxMerge (children 1)
     ExpressionList (children 1)
      Identifier x
    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 2)
               Function unhex (children 1)
                ExpressionList (children 1)
                 Literal \'fffffffe\'
               Function randomString (children 1)
                ExpressionList (children 1)
                 Literal UInt64_100500
             Literal \'AggregateFunction(max, String)\'
