SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Identifier a
    Identifier b
    Identifier all
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier order_by_all
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier all
    OrderByElement (children 1)
     Identifier a
