SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 3)
    Function intDiv (alias k) (children 1)
     ExpressionList (children 2)
      Identifier number
      Literal UInt64_2
    Function count (children 1)
     ExpressionList
    Function argMax (children 1)
     ExpressionList (children 2)
      Function toString (children 1)
       ExpressionList (children 1)
        Identifier number
      Identifier number
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 1)
           Identifier number
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.numbers
          Literal UInt64_500000
   ExpressionList (children 1)
    Identifier k
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier k
   Literal UInt64_10