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/*-------------------------------------------------------------------------
*
* gist.h
* The public API for GiST indexes. This API is exposed to
* individuals implementing GiST indexes, so backward-incompatible
* changes should be made with care.
*
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/gist.h,v 1.46 2005/05/17 03:34:18 neilc Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef GIST_H
#define GIST_H
#include "storage/bufpage.h"
#include "storage/off.h"
#include "utils/rel.h"
/*
* amproc indexes for GiST indexes.
*/
#define GIST_CONSISTENT_PROC 1
#define GIST_UNION_PROC 2
#define GIST_COMPRESS_PROC 3
#define GIST_DECOMPRESS_PROC 4
#define GIST_PENALTY_PROC 5
#define GIST_PICKSPLIT_PROC 6
#define GIST_EQUAL_PROC 7
#define GISTNProcs 7
/*
* Page opaque data in a GiST index page.
*/
#define F_LEAF (1 << 0)
typedef struct GISTPageOpaqueData
{
uint32 flags;
} GISTPageOpaqueData;
typedef GISTPageOpaqueData *GISTPageOpaque;
/*
* This is the Split Vector to be returned by the PickSplit method.
*/
typedef struct GIST_SPLITVEC
{
OffsetNumber *spl_left; /* array of entries that go left */
int spl_nleft; /* size of this array */
Datum spl_ldatum; /* Union of keys in spl_left */
Datum spl_lattr[INDEX_MAX_KEYS]; /* Union of subkeys in
* spl_left */
int spl_lattrsize[INDEX_MAX_KEYS];
bool spl_lisnull[INDEX_MAX_KEYS];
OffsetNumber *spl_right; /* array of entries that go right */
int spl_nright; /* size of the array */
Datum spl_rdatum; /* Union of keys in spl_right */
Datum spl_rattr[INDEX_MAX_KEYS]; /* Union of subkeys in
* spl_right */
int spl_rattrsize[INDEX_MAX_KEYS];
bool spl_risnull[INDEX_MAX_KEYS];
int *spl_idgrp;
int *spl_ngrp; /* number in each group */
char *spl_grpflag; /* flags of each group */
} GIST_SPLITVEC;
/*
* An entry on a GiST node. Contains the key, as well as its own
* location (rel,page,offset) which can supply the matching pointer.
* The size of the key is in bytes, and leafkey is a flag to tell us
* if the entry is in a leaf node.
*/
typedef struct GISTENTRY
{
Datum key;
Relation rel;
Page page;
OffsetNumber offset;
int bytes;
bool leafkey;
} GISTENTRY;
#define GIST_LEAF(entry) (((GISTPageOpaque) PageGetSpecialPointer((entry)->page))->flags & F_LEAF)
/*
* Vector of GISTENTRY structs; user-defined methods union and pick
* split takes it as one of their arguments
*/
typedef struct
{
int32 n; /* number of elements */
GISTENTRY vector[1];
} GistEntryVector;
#define GEVHDRSZ (offsetof(GistEntryVector, vector[0]))
/*
* macro to initialize a GISTENTRY
*/
#define gistentryinit(e, k, r, pg, o, b, l) \
do { (e).key = (k); (e).rel = (r); (e).page = (pg); \
(e).offset = (o); (e).bytes = (b); (e).leafkey = (l); } while (0)
#endif /* GIST_H */
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