postgresql/contrib/btree_gist/btree_interval.c
Heikki Linnakangas e09b48316c Add index-only scan support to btree_gist.
inet, cidr, and timetz indexes still cannot support index-only scans,
because they don't store the original unmodified value in the index, but a
derived approximate value.
2015-03-27 23:35:16 +02:00

303 lines
7.1 KiB
C

/*
* contrib/btree_gist/btree_interval.c
*/
#include "postgres.h"
#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/timestamp.h"
typedef struct
{
Interval lower,
upper;
} intvKEY;
/*
** Interval ops
*/
PG_FUNCTION_INFO_V1(gbt_intv_compress);
PG_FUNCTION_INFO_V1(gbt_intv_fetch);
PG_FUNCTION_INFO_V1(gbt_intv_decompress);
PG_FUNCTION_INFO_V1(gbt_intv_union);
PG_FUNCTION_INFO_V1(gbt_intv_picksplit);
PG_FUNCTION_INFO_V1(gbt_intv_consistent);
PG_FUNCTION_INFO_V1(gbt_intv_distance);
PG_FUNCTION_INFO_V1(gbt_intv_penalty);
PG_FUNCTION_INFO_V1(gbt_intv_same);
static bool
gbt_intvgt(const void *a, const void *b)
{
return DatumGetBool(DirectFunctionCall2(interval_gt, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}
static bool
gbt_intvge(const void *a, const void *b)
{
return DatumGetBool(DirectFunctionCall2(interval_ge, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}
static bool
gbt_intveq(const void *a, const void *b)
{
return DatumGetBool(DirectFunctionCall2(interval_eq, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}
static bool
gbt_intvle(const void *a, const void *b)
{
return DatumGetBool(DirectFunctionCall2(interval_le, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}
static bool
gbt_intvlt(const void *a, const void *b)
{
return DatumGetBool(DirectFunctionCall2(interval_lt, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}
static int
gbt_intvkey_cmp(const void *a, const void *b)
{
intvKEY *ia = (intvKEY *) (((const Nsrt *) a)->t);
intvKEY *ib = (intvKEY *) (((const Nsrt *) b)->t);
int res;
res = DatumGetInt32(DirectFunctionCall2(interval_cmp, IntervalPGetDatum(&ia->lower), IntervalPGetDatum(&ib->lower)));
if (res == 0)
return DatumGetInt32(DirectFunctionCall2(interval_cmp, IntervalPGetDatum(&ia->upper), IntervalPGetDatum(&ib->upper)));
return res;
}
static double
intr2num(const Interval *i)
{
return INTERVAL_TO_SEC(i);
}
static float8
gbt_intv_dist(const void *a, const void *b)
{
return (float8) Abs(intr2num((const Interval *) a) - intr2num((const Interval *) b));
}
/*
* INTERVALSIZE should be the actual size-on-disk of an Interval, as shown
* in pg_type. This might be less than sizeof(Interval) if the compiler
* insists on adding alignment padding at the end of the struct. (Note:
* this concern is obsolete with the current definition of Interval, but
* was real before a separate "day" field was added to it.)
*/
#define INTERVALSIZE 16
static const gbtree_ninfo tinfo =
{
gbt_t_intv,
sizeof(Interval),
32, /* sizeof(gbtreekey32) */
gbt_intvgt,
gbt_intvge,
gbt_intveq,
gbt_intvle,
gbt_intvlt,
gbt_intvkey_cmp,
gbt_intv_dist
};
Interval *
abs_interval(Interval *a)
{
static Interval zero = {0, 0, 0};
if (DatumGetBool(DirectFunctionCall2(interval_lt,
IntervalPGetDatum(a),
IntervalPGetDatum(&zero))))
a = DatumGetIntervalP(DirectFunctionCall1(interval_um,
IntervalPGetDatum(a)));
return a;
}
PG_FUNCTION_INFO_V1(interval_dist);
Datum
interval_dist(PG_FUNCTION_ARGS)
{
Datum diff = DirectFunctionCall2(interval_mi,
PG_GETARG_DATUM(0),
PG_GETARG_DATUM(1));
PG_RETURN_INTERVAL_P(abs_interval(DatumGetIntervalP(diff)));
}
/**************************************************
* interval ops
**************************************************/
Datum
gbt_intv_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = entry;
if (entry->leafkey || INTERVALSIZE != sizeof(Interval))
{
char *r = (char *) palloc(2 * INTERVALSIZE);
retval = palloc(sizeof(GISTENTRY));
if (entry->leafkey)
{
Interval *key = DatumGetIntervalP(entry->key);
memcpy((void *) r, (void *) key, INTERVALSIZE);
memcpy((void *) (r + INTERVALSIZE), (void *) key, INTERVALSIZE);
}
else
{
intvKEY *key = (intvKEY *) DatumGetPointer(entry->key);
memcpy(r, &key->lower, INTERVALSIZE);
memcpy(r + INTERVALSIZE, &key->upper, INTERVALSIZE);
}
gistentryinit(*retval, PointerGetDatum(r),
entry->rel, entry->page,
entry->offset, FALSE);
}
PG_RETURN_POINTER(retval);
}
Datum
gbt_intv_fetch(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}
Datum
gbt_intv_decompress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = entry;
if (INTERVALSIZE != sizeof(Interval))
{
intvKEY *r = palloc(sizeof(intvKEY));
char *key = DatumGetPointer(entry->key);
retval = palloc(sizeof(GISTENTRY));
memcpy(&r->lower, key, INTERVALSIZE);
memcpy(&r->upper, key + INTERVALSIZE, INTERVALSIZE);
gistentryinit(*retval, PointerGetDatum(r),
entry->rel, entry->page,
entry->offset, FALSE);
}
PG_RETURN_POINTER(retval);
}
Datum
gbt_intv_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
Interval *query = PG_GETARG_INTERVAL_P(1);
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
/* Oid subtype = PG_GETARG_OID(3); */
bool *recheck = (bool *) PG_GETARG_POINTER(4);
intvKEY *kkk = (intvKEY *) DatumGetPointer(entry->key);
GBT_NUMKEY_R key;
/* All cases served by this function are exact */
*recheck = false;
key.lower = (GBT_NUMKEY *) &kkk->lower;
key.upper = (GBT_NUMKEY *) &kkk->upper;
PG_RETURN_BOOL(
gbt_num_consistent(&key, (void *) query, &strategy, GIST_LEAF(entry), &tinfo)
);
}
Datum
gbt_intv_distance(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
Interval *query = PG_GETARG_INTERVAL_P(1);
/* Oid subtype = PG_GETARG_OID(3); */
intvKEY *kkk = (intvKEY *) DatumGetPointer(entry->key);
GBT_NUMKEY_R key;
key.lower = (GBT_NUMKEY *) &kkk->lower;
key.upper = (GBT_NUMKEY *) &kkk->upper;
PG_RETURN_FLOAT8(
gbt_num_distance(&key, (void *) query, GIST_LEAF(entry), &tinfo)
);
}
Datum
gbt_intv_union(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
void *out = palloc(sizeof(intvKEY));
*(int *) PG_GETARG_POINTER(1) = sizeof(intvKEY);
PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo));
}
Datum
gbt_intv_penalty(PG_FUNCTION_ARGS)
{
intvKEY *origentry = (intvKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
intvKEY *newentry = (intvKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
float *result = (float *) PG_GETARG_POINTER(2);
double iorg[2],
inew[2];
iorg[0] = intr2num(&origentry->lower);
iorg[1] = intr2num(&origentry->upper);
inew[0] = intr2num(&newentry->lower);
inew[1] = intr2num(&newentry->upper);
penalty_num(result, iorg[0], iorg[1], inew[0], inew[1]);
PG_RETURN_POINTER(result);
}
Datum
gbt_intv_picksplit(PG_FUNCTION_ARGS)
{
PG_RETURN_POINTER(gbt_num_picksplit(
(GistEntryVector *) PG_GETARG_POINTER(0),
(GIST_SPLITVEC *) PG_GETARG_POINTER(1),
&tinfo
));
}
Datum
gbt_intv_same(PG_FUNCTION_ARGS)
{
intvKEY *b1 = (intvKEY *) PG_GETARG_POINTER(0);
intvKEY *b2 = (intvKEY *) PG_GETARG_POINTER(1);
bool *result = (bool *) PG_GETARG_POINTER(2);
*result = gbt_num_same((void *) b1, (void *) b2, &tinfo);
PG_RETURN_POINTER(result);
}