SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Identifier max
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 2)
           Function max (alias max) (children 1)
            ExpressionList (children 1)
             Identifier first_col
           Identifier second_col (alias total)
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier tp2
          ExpressionList (children 1)
           Literal UInt64_2
   ExpressionList (children 1)
    OrderByElement (children 1)
     Literal UInt64_1