SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   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_direct
   ExpressionList (children 1)
    Identifier category
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier category
