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BTREE_VERSION_1: using bti_itup->t_tid as unique identifier for a given 

index tuple (logical position within A LEVEL). bti_oid & bti_dummy
taken off from BTItemData.
This commit is contained in:
Vadim B. Mikheev 1997-04-16 01:21:59 +00:00
parent cacaaed62b
commit afd9295786
1 changed files with 21 additions and 2 deletions
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23
src/include/access/nbtree.h
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@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: nbtree.h,v 1.11 1997/03/24 08:04:51 vadim Exp $
* $Id: nbtree.h,v 1.12 1997/04/16 01:21:59 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -84,18 +84,37 @@ typedef BTScanOpaqueData *BTScanOpaque;
* tuples. Note that we do not use the OID as part of a composite
* key; the OID only serves as a unique identifier for a given index
* tuple (logical position within a page).
*
* New comments:
* actually, we must guarantee that all tuples in A LEVEL
* are unique, not in ALL INDEX. So, we can use bti_itup->t_tid
* as unique identifier for a given index tuple (logical position
* within a level). - vadim 04/09/97
*/
typedef struct BTItemData {
#ifndef BTREE_VERSION_1
Oid bti_oid;
int32 bti_dummy; /* padding to make bti_itup
* align at 8-byte boundary
*/
#endif
IndexTupleData bti_itup;
} BTItemData;
typedef BTItemData *BTItem;
#ifdef BTREE_VERSION_1
#define BTItemSame(i1, i2) ( i1->bti_itup.t_tid.ip_blkid.bi_hi == \
i2->bti_itup.t_tid.ip_blkid.bi_hi && \
i1->bti_itup.t_tid.ip_blkid.bi_lo == \
i2->bti_itup.t_tid.ip_blkid.bi_lo && \
i1->bti_itup.t_tid.ip_posid == \
i2->bti_itup.t_tid.ip_posid )
#else
#define BTItemSame(i1, i2) ( i1->bti_oid == i2->bti_oid )
#endif
/*
* BTStackData -- As we descend a tree, we push the (key, pointer)
* pairs from internal nodes onto a private stack. If we split a
@ -206,7 +225,7 @@ extern void _bt_relbuf(Relation rel, Buffer buf, int access);
extern void _bt_wrtbuf(Relation rel, Buffer buf);
extern void _bt_wrtnorelbuf(Relation rel, Buffer buf);
extern void _bt_pageinit(Page page, Size size);
extern void _bt_metaproot(Relation rel, BlockNumber rootbknum);
extern void _bt_metaproot(Relation rel, BlockNumber rootbknum, int level);
extern Buffer _bt_getstackbuf(Relation rel, BTStack stack, int access);
extern void _bt_setpagelock(Relation rel, BlockNumber blkno, int access);
extern void _bt_unsetpagelock(Relation rel, BlockNumber blkno, int access);