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103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* rtree.h--
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* common declarations for the rtree access method code.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: rtree.h,v 1.2 1996/11/05 08:18:14 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef RTREE_H
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#define RTREE_H
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#include <access/skey.h>
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#include <storage/block.h>
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#include <storage/off.h>
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/* see rtstrat.c for what all this is about */
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#define RTNStrategies 8
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#define RTLeftStrategyNumber 1
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#define RTOverLeftStrategyNumber 2
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#define RTOverlapStrategyNumber 3
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#define RTOverRightStrategyNumber 4
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#define RTRightStrategyNumber 5
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#define RTSameStrategyNumber 6
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#define RTContainsStrategyNumber 7
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#define RTContainedByStrategyNumber 8
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#define RTNProcs 3
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#define RT_UNION_PROC 1
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#define RT_INTER_PROC 2
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#define RT_SIZE_PROC 3
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#define F_LEAF (1 << 0)
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typedef struct RTreePageOpaqueData {
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uint32 flags;
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} RTreePageOpaqueData;
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typedef RTreePageOpaqueData *RTreePageOpaque;
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/*
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* When we descend a tree, we keep a stack of parent pointers.
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*/
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typedef struct RTSTACK {
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struct RTSTACK *rts_parent;
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OffsetNumber rts_child;
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BlockNumber rts_blk;
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} RTSTACK;
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/*
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* When we're doing a scan, we need to keep track of the parent stack
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* for the marked and current items. Also, rtrees have the following
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* property: if you're looking for the box (1,1,2,2), on the internal
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* nodes you have to search for all boxes that *contain* (1,1,2,2), and
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* not the ones that match it. We have a private scan key for internal
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* nodes in the opaque structure for rtrees for this reason. See
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* access/index-rtree/rtscan.c and rtstrat.c for how it gets initialized.
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*/
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typedef struct RTreeScanOpaqueData {
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struct RTSTACK *s_stack;
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struct RTSTACK *s_markstk;
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uint16 s_flags;
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uint16 s_internalNKey;
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ScanKey s_internalKey;
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} RTreeScanOpaqueData;
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typedef RTreeScanOpaqueData *RTreeScanOpaque;
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/*
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* When we're doing a scan and updating a tree at the same time, the
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* updates may affect the scan. We use the flags entry of the scan's
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* opaque space to record our actual position in response to updates
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* that we can't handle simply by adjusting pointers.
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*/
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#define RTS_CURBEFORE ((uint16) (1 << 0))
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#define RTS_MRKBEFORE ((uint16) (1 << 1))
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/* root page of an rtree */
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#define P_ROOT 0
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/*
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* When we update a relation on which we're doing a scan, we need to
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* check the scan and fix it if the update affected any of the pages it
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* touches. Otherwise, we can miss records that we should see. The only
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* times we need to do this are for deletions and splits. See the code in
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* rtscan.c for how the scan is fixed. These two contants tell us what sort
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* of operation changed the index.
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*/
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#define RTOP_DEL 0
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#define RTOP_SPLIT 1
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/* defined in rtree.c */
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extern void freestack(RTSTACK *s);
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#endif /* RTREE_H */
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