postgresql/contrib/btree_gist/btree_utils_num.h
2010-09-20 22:08:53 +02:00

116 lines
2.9 KiB
C

/*
* contrib/btree_gist/btree_utils_num.h
*/
#ifndef __BTREE_UTILS_NUM_H__
#define __BTREE_UTILS_NUM_H__
#include "btree_gist.h"
#include "utils/rel.h"
#include <math.h>
#include <float.h>
typedef char GBT_NUMKEY;
/* Better readable key */
typedef struct
{
const GBT_NUMKEY *lower,
*upper;
} GBT_NUMKEY_R;
/* for sorting */
typedef struct
{
int i;
GBT_NUMKEY *t;
} Nsrt;
/* type description */
typedef struct
{
/* Attribs */
enum gbtree_type t; /* data type */
int32 size; /* size of type , 0 means variable */
/* Methods */
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 */
int (*f_cmp) (const void *, const void *); /* key compare function */
} gbtree_ninfo;
/*
* Numeric btree functions
*/
/*
* Note: The factor 0.49 in following macro avoids floating point overflows
*/
#define penalty_num(result,olower,oupper,nlower,nupper) do { \
double tmp = 0.0F; \
(*(result)) = 0.0F; \
if ( (nupper) > (oupper) ) \
tmp += ( ((double)nupper)*0.49F - ((double)oupper)*0.49F ); \
if ( (olower) > (nlower) ) \
tmp += ( ((double)olower)*0.49F - ((double)nlower)*0.49F ); \
if (tmp > 0.0F) \
{ \
(*(result)) += FLT_MIN; \
(*(result)) += (float) ( ((double)(tmp)) / ( (double)(tmp) + ( ((double)(oupper))*0.49F - ((double)(olower))*0.49F ) ) ); \
(*(result)) *= (FLT_MAX / (((GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1)); \
} \
} while (0);
/*
* Convert an Interval to an approximate equivalent number of seconds
* (as a double). Here because we need it for time/timetz as well as
* interval. See interval_cmp_internal for comparison.
*/
#ifdef HAVE_INT64_TIMESTAMP
#define INTERVAL_TO_SEC(ivp) \
(((double) (ivp)->time) / ((double) USECS_PER_SEC) + \
(ivp)->day * (24.0 * SECS_PER_HOUR) + \
(ivp)->month * (30.0 * SECS_PER_DAY))
#else
#define INTERVAL_TO_SEC(ivp) \
((ivp)->time + \
(ivp)->day * (24.0 * SECS_PER_HOUR) + \
(ivp)->month * (30.0 * SECS_PER_DAY))
#endif
extern bool gbt_num_consistent(const GBT_NUMKEY_R *key, const void *query,
const StrategyNumber *strategy, bool is_leaf,
const gbtree_ninfo *tinfo);
extern GIST_SPLITVEC *gbt_num_picksplit(const GistEntryVector *entryvec, GIST_SPLITVEC *v,
const gbtree_ninfo *tinfo);
extern GISTENTRY *gbt_num_compress(GISTENTRY *retval, GISTENTRY *entry,
const gbtree_ninfo *tinfo);
extern void *gbt_num_union(GBT_NUMKEY *out, const GistEntryVector *entryvec,
const gbtree_ninfo *tinfo);
extern bool gbt_num_same(const GBT_NUMKEY *a, const GBT_NUMKEY *b,
const gbtree_ninfo *tinfo);
extern void gbt_num_bin_union(Datum *u, GBT_NUMKEY *e,
const gbtree_ninfo *tinfo);
#endif