Return-Path: pg_adm@postgres.berkeley.edu Received: by postgres.Berkeley.EDU (5.61/1.29) id AA14708; Mon, 24 Aug 92 04:38:51 -0700 Message-Id: <9208241138.AA14708@postgres.Berkeley.EDU> From: "Schenkelaars.V.F" Subject: IndexTupleData struct has no room for pointer indication To: postgres@postgres.berkeley.edu Sender: pg_adm@postgres.berkeley.edu To: postgres@postgres.berkeley.edu (Postgres mailing list) Date: Mon, 24 Aug 92 13:44:38 MET DST Cc: mao@postgres.berkeley.edu (Mike Olson) X-Mailer: ELM [version 2.3 PL11] Dear Postgres group, In my attempt to add a newaccess method I need a way to distinguish the indextuple data pointer from the index tuple tree pointer. Your IndexTupleData struct seems to have no room for such indicator. Here is the code of IndexTupleData typedef struct IndexTupleData { ItemPointerData t_tid; /* reference TID to base tuple */ /* * t_info is layed out in the following fashion: * * first (leftmost) bit: "has nulls" bit * second bit: "has varlenas" bit * third bit: "has rules" bit * fourth-16th bit: size of tuple. */ unsigned short t_info; /* various info about tuple */ #ifdef NOTDEF char t_locktype; /* type of rule lock representation*/ IndexAttributeBitMapData bits; /* bitmap of domains */ #endif } IndexTupleData; /* MORE DATA FOLLOWS AT END OF STRUCT */ t_info looks like a good place for such flag, but it seems there is no room left. In my opinion it looks like you didn't consider a access method wich has a mixture of data pointer and tree pointers in a node. Or am I missing something? Is there a easy way to distinghuish these two pointers. Regards, and keep up the good work, ____________________ \ / . _ _ _ _ | \/ ( ( \ (_ (-' ( \ | -------------------------------------------------------------------------------- Vincent F. Schenkelaars | Company: FEL-TNO | Private: Email : V.F.Schenkelaars@tnofel.fel.tno.nl | address: Oude Waalsdorperweg 63 | Groenhovenstraat 12 Postbus 96864 | 2509 JG Den Haag | 2311 BT Leiden The Netherlands | The Netherlands Phone : Holland 070-3264221 | Holland 071-125576 Fax : Holland 070-3280961 | -------------------------------------------------------------------------------- We apologize for the inconvenience.