postgresql/contrib/btree_gist/btree_ts.c
Teodor Sigaev 1f7ef548ec Changes
* new split algorithm (as proposed in http://archives.postgresql.org/pgsql-hackers/2006-06/msg00254.php)
  * possible call pickSplit() for second and below columns
  * add spl_(l|r)datum_exists to GIST_SPLITVEC -
    pickSplit should check its values to use already defined
    spl_(l|r)datum for splitting. pickSplit should set
    spl_(l|r)datum_exists to 'false' (if they was 'true') to
    signal to caller about using spl_(l|r)datum.
  * support for old pickSplit(): not very optimal
    but correct split
* remove 'bytes' field from GISTENTRY: in any case size of
  value is defined by it's type.
* split GIST_SPLITVEC to two structures: one for using in picksplit
  and second - for internal use.
* some code refactoring
* support of subsplit to rtree opclasses

TODO: add support of subsplit to contrib modules
2006-06-28 12:00:14 +00:00

279 lines
5.9 KiB
C

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/datetime.h"
typedef struct
{
Timestamp lower;
Timestamp upper;
} tsKEY;
/*
** timestamp ops
*/
PG_FUNCTION_INFO_V1(gbt_ts_compress);
PG_FUNCTION_INFO_V1(gbt_tstz_compress);
PG_FUNCTION_INFO_V1(gbt_ts_union);
PG_FUNCTION_INFO_V1(gbt_ts_picksplit);
PG_FUNCTION_INFO_V1(gbt_ts_consistent);
PG_FUNCTION_INFO_V1(gbt_tstz_consistent);
PG_FUNCTION_INFO_V1(gbt_ts_penalty);
PG_FUNCTION_INFO_V1(gbt_ts_same);
Datum gbt_ts_compress(PG_FUNCTION_ARGS);
Datum gbt_tstz_compress(PG_FUNCTION_ARGS);
Datum gbt_ts_union(PG_FUNCTION_ARGS);
Datum gbt_ts_picksplit(PG_FUNCTION_ARGS);
Datum gbt_ts_consistent(PG_FUNCTION_ARGS);
Datum gbt_tstz_consistent(PG_FUNCTION_ARGS);
Datum gbt_ts_penalty(PG_FUNCTION_ARGS);
Datum gbt_ts_same(PG_FUNCTION_ARGS);
#define P_TimestampGetDatum(x) PointerGetDatum( &(x) )
static bool
gbt_tsgt(const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(timestamp_gt, PointerGetDatum(a), PointerGetDatum(b))
);
}
static bool
gbt_tsge(const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(timestamp_ge, PointerGetDatum(a), PointerGetDatum(b))
);
}
static bool
gbt_tseq(const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(timestamp_eq, PointerGetDatum(a), PointerGetDatum(b))
);
}
static bool
gbt_tsle(const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(timestamp_le, PointerGetDatum(a), PointerGetDatum(b))
);
}
static bool
gbt_tslt(const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(timestamp_lt, PointerGetDatum(a), PointerGetDatum(b))
);
}
static int
gbt_tskey_cmp(const void *a, const void *b)
{
if (gbt_tsgt((void *) &(((Nsrt *) a)->t[0]), (void *) &(((Nsrt *) b)->t[0])))
return 1;
else if (gbt_tslt((void *) &(((Nsrt *) a)->t[0]), (void *) &(((Nsrt *) b)->t[0])))
return -1;
return 0;
}
static const gbtree_ninfo tinfo =
{
gbt_t_ts,
sizeof(Timestamp),
gbt_tsgt,
gbt_tsge,
gbt_tseq,
gbt_tsle,
gbt_tslt,
gbt_tskey_cmp
};
/**************************************************
* timestamp ops
**************************************************/
static Timestamp *
tstz_to_ts_gmt(Timestamp *gmt, TimestampTz *ts)
{
int val,
tz;
*gmt = *ts;
DecodeSpecial(0, "gmt", &val);
if (*ts < DT_NOEND && *ts > DT_NOBEGIN)
{
tz = val * 60;
#ifdef HAVE_INT64_TIMESTAMP
*gmt -= (tz * INT64CONST(1000000));
#else
*gmt -= tz;
#endif
}
return gmt;
}
Datum
gbt_ts_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = NULL;
PG_RETURN_POINTER(gbt_num_compress(retval, entry, &tinfo));
}
Datum
gbt_tstz_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval;
if (entry->leafkey)
{
tsKEY *r = (tsKEY *) palloc(sizeof(tsKEY));
TimestampTz ts = *(TimestampTz *) DatumGetPointer(entry->key);
Timestamp gmt;
tstz_to_ts_gmt(&gmt, &ts);
retval = palloc(sizeof(GISTENTRY));
r->lower = r->upper = gmt;
gistentryinit(*retval, PointerGetDatum(r),
entry->rel, entry->page,
entry->offset, FALSE);
}
else
retval = entry;
PG_RETURN_POINTER(retval);
}
Datum
gbt_ts_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
Timestamp *query = (Timestamp *) PG_GETARG_POINTER(1);
tsKEY *kkk = (tsKEY *) DatumGetPointer(entry->key);
GBT_NUMKEY_R key;
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
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_tstz_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
TimestampTz *query = (Timestamp *) PG_GETARG_POINTER(1);
char *kkk = (char *) DatumGetPointer(entry->key);
GBT_NUMKEY_R key;
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
Timestamp qqq;
key.lower = (GBT_NUMKEY *) & kkk[0];
key.upper = (GBT_NUMKEY *) & kkk[MAXALIGN(tinfo.size)];
tstz_to_ts_gmt(&qqq, query);
PG_RETURN_BOOL(
gbt_num_consistent(&key, (void *) &qqq, &strategy, GIST_LEAF(entry), &tinfo)
);
}
Datum
gbt_ts_union(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
void *out = palloc(sizeof(tsKEY));
*(int *) PG_GETARG_POINTER(1) = sizeof(tsKEY);
PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo));
}
#define penalty_check_max_float(val) do { \
if ( val > FLT_MAX ) \
val = FLT_MAX; \
if ( val < -FLT_MAX ) \
val = -FLT_MAX; \
} while(false);
Datum
gbt_ts_penalty(PG_FUNCTION_ARGS)
{
tsKEY *origentry = (tsKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
tsKEY *newentry = (tsKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
float *result = (float *) PG_GETARG_POINTER(2);
double orgdbl[2],
newdbl[2];
/*
* We are allways using "double" timestamps here. Precision should be good
* enough.
*/
orgdbl[0] = ((double) origentry->lower);
orgdbl[1] = ((double) origentry->upper);
newdbl[0] = ((double) newentry->lower);
newdbl[1] = ((double) newentry->upper);
penalty_check_max_float(orgdbl[0]);
penalty_check_max_float(orgdbl[1]);
penalty_check_max_float(newdbl[0]);
penalty_check_max_float(newdbl[1]);
penalty_num(result, orgdbl[0], orgdbl[1], newdbl[0], newdbl[1]);
PG_RETURN_POINTER(result);
}
Datum
gbt_ts_picksplit(PG_FUNCTION_ARGS)
{
PG_RETURN_POINTER(gbt_num_picksplit(
(GistEntryVector *) PG_GETARG_POINTER(0),
(GIST_SPLITVEC *) PG_GETARG_POINTER(1),
&tinfo
));
}
Datum
gbt_ts_same(PG_FUNCTION_ARGS)
{
tsKEY *b1 = (tsKEY *) PG_GETARG_POINTER(0);
tsKEY *b2 = (tsKEY *) PG_GETARG_POINTER(1);
bool *result = (bool *) PG_GETARG_POINTER(2);
*result = gbt_num_same((void *) b1, (void *) b2, &tinfo);
PG_RETURN_POINTER(result);
}