postgresql/contrib/btree_gist/btree_utils_var.h

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/*
* $PostgreSQL: pgsql/contrib/btree_gist/btree_utils_var.h,v 1.8 2008/05/17 01:28:19 adunstan Exp $
*/
#ifndef __BTREE_UTILS_VAR_H__
#define __BTREE_UTILS_VAR_H__
#include "btree_gist.h"
#include "mb/pg_wchar.h"
/* Variable length key */
typedef bytea GBT_VARKEY;
/* Better readable key */
typedef struct
{
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bytea *lower,
*upper;
} GBT_VARKEY_R;
/* used for key sorting */
typedef struct
{
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int i;
GBT_VARKEY *t;
} Vsrt;
/*
type description
*/
typedef struct
{
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/* Attribs */
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enum gbtree_type t; /* data type */
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int32 eml; /* cached pg_database_encoding_max_length (0:
* undefined) */
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bool trnc; /* truncate (=compress) key */
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/* Methods */
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bool (*f_gt) (const void *, const void *); /* greater then */
bool (*f_ge) (const void *, const void *); /* greater equal */
bool (*f_eq) (const void *, const void *); /* equal */
bool (*f_le) (const void *, const void *); /* less equal */
bool (*f_lt) (const void *, const void *); /* less then */
int32 (*f_cmp) (const bytea *, const bytea *); /* node compare */
GBT_VARKEY *(*f_l2n) (GBT_VARKEY *); /* convert leaf to node */
} gbtree_vinfo;
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extern GBT_VARKEY_R gbt_var_key_readable(const GBT_VARKEY * k);
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extern GBT_VARKEY *gbt_var_key_copy(const GBT_VARKEY_R * u, bool force_node);
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extern GISTENTRY *gbt_var_compress(GISTENTRY *entry, const gbtree_vinfo * tinfo);
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extern GBT_VARKEY *gbt_var_union(const GistEntryVector *entryvec, int32 *size,
const gbtree_vinfo * tinfo);
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extern bool gbt_var_same(bool *result, const Datum d1, const Datum d2,
const gbtree_vinfo * tinfo);
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extern float *gbt_var_penalty(float *res, const GISTENTRY *o, const GISTENTRY *n,
const gbtree_vinfo * tinfo);
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extern bool gbt_var_consistent(GBT_VARKEY_R * key, const void *query,
const StrategyNumber *strategy, bool is_leaf,
const gbtree_vinfo * tinfo);
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extern GIST_SPLITVEC *gbt_var_picksplit(const GistEntryVector *entryvec, GIST_SPLITVEC *v,
const gbtree_vinfo * tinfo);
extern void gbt_var_bin_union(Datum *u, GBT_VARKEY * e,
const gbtree_vinfo * tinfo);
#endif