SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Identifier category
    Identifier total
   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 concat (alias category) (children 1)
            ExpressionList (children 2)
             Identifier category
             Literal \'_modified\'
           Function sum (alias total) (children 1)
            ExpressionList (children 1)
             Identifier value
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier test_group_by_sub
          ExpressionList (children 1)
           Identifier category
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier category
