btree_time.c

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/*
 * contrib/btree_gist/btree_time.c
 */
#include "postgres.h"
 
#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/fmgrprotos.h"
#include "utils/date.h"
#include "utils/rel.h"
#include "utils/sortsupport.h"
#include "utils/timestamp.h"
 
typedef struct
{
    TimeADT     lower;
    TimeADT     upper;
} timeKEY;
 
/* GiST support functions */
PG_FUNCTION_INFO_V1(gbt_time_compress);
PG_FUNCTION_INFO_V1(gbt_timetz_compress);
PG_FUNCTION_INFO_V1(gbt_time_fetch);
PG_FUNCTION_INFO_V1(gbt_time_union);
PG_FUNCTION_INFO_V1(gbt_time_picksplit);
PG_FUNCTION_INFO_V1(gbt_time_consistent);
PG_FUNCTION_INFO_V1(gbt_time_distance);
PG_FUNCTION_INFO_V1(gbt_timetz_consistent);
PG_FUNCTION_INFO_V1(gbt_time_penalty);
PG_FUNCTION_INFO_V1(gbt_time_same);
PG_FUNCTION_INFO_V1(gbt_time_sortsupport);
PG_FUNCTION_INFO_V1(gbt_timetz_sortsupport);
 
 
static bool
gbt_timegt(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;
 
    return DatumGetBool(DirectFunctionCall2(time_gt,
                                            TimeADTGetDatum(*aa),
                                            TimeADTGetDatum(*bb)));
}
 
static bool
gbt_timege(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;
 
    return DatumGetBool(DirectFunctionCall2(time_ge,
                                            TimeADTGetDatum(*aa),
                                            TimeADTGetDatum(*bb)));
}
 
static bool
gbt_timeeq(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;
 
    return DatumGetBool(DirectFunctionCall2(time_eq,
                                            TimeADTGetDatum(*aa),
                                            TimeADTGetDatum(*bb)));
}
 
static bool
gbt_timele(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;
 
    return DatumGetBool(DirectFunctionCall2(time_le,
                                            TimeADTGetDatum(*aa),
                                            TimeADTGetDatum(*bb)));
}
 
static bool
gbt_timelt(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;
 
    return DatumGetBool(DirectFunctionCall2(time_lt,
                                            TimeADTGetDatum(*aa),
                                            TimeADTGetDatum(*bb)));
}
 
static int
gbt_timekey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
    timeKEY    *ia = (timeKEY *) (((const Nsrt *) a)->t);
    timeKEY    *ib = (timeKEY *) (((const Nsrt *) b)->t);
    int         res;
 
    res = DatumGetInt32(DirectFunctionCall2(time_cmp, TimeADTGetDatum(ia->lower), TimeADTGetDatum(ib->lower)));
    if (res == 0)
        return DatumGetInt32(DirectFunctionCall2(time_cmp, TimeADTGetDatum(ia->upper), TimeADTGetDatum(ib->upper)));
 
    return res;
}
 
static float8
gbt_time_dist(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;
    Interval   *i;
 
    i = DatumGetIntervalP(DirectFunctionCall2(time_mi_time,
                                              TimeADTGetDatum(*aa),
                                              TimeADTGetDatum(*bb)));
    return fabs(INTERVAL_TO_SEC(i));
}
 
 
static const gbtree_ninfo tinfo =
{
    gbt_t_time,
    sizeof(TimeADT),
    16,                         /* sizeof(gbtreekey16) */
    gbt_timegt,
    gbt_timege,
    gbt_timeeq,
    gbt_timele,
    gbt_timelt,
    gbt_timekey_cmp,
    gbt_time_dist
};
 
 
PG_FUNCTION_INFO_V1(time_dist);
Datum
time_dist(PG_FUNCTION_ARGS)
{
    Datum       diff = DirectFunctionCall2(time_mi_time,
                                           PG_GETARG_DATUM(0),
                                           PG_GETARG_DATUM(1));
 
    PG_RETURN_INTERVAL_P(abs_interval(DatumGetIntervalP(diff)));
}
 
 
/**************************************************
 * GiST support functions
 **************************************************/
 
Datum
gbt_time_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 
    PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
}
 
Datum
gbt_timetz_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    GISTENTRY  *retval;
 
    if (entry->leafkey)
    {
        timeKEY    *r = (timeKEY *) palloc(sizeof(timeKEY));
        TimeTzADT  *tz = DatumGetTimeTzADTP(entry->key);
        TimeADT     tmp;
 
        retval = palloc(sizeof(GISTENTRY));
 
        /* We are using the time + zone only to compress */
        tmp = tz->time + (tz->zone * INT64CONST(1000000));
        r->lower = r->upper = tmp;
        gistentryinit(*retval, PointerGetDatum(r),
                      entry->rel, entry->page,
                      entry->offset, false);
    }
    else
        retval = entry;
    PG_RETURN_POINTER(retval);
}
 
Datum
gbt_time_fetch(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 
    PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}
 
Datum
gbt_time_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    TimeADT     query = PG_GETARG_TIMEADT(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
 
    /* Oid      subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    timeKEY    *kkk = (timeKEY *) 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, &query, &strategy,
                                      GIST_LEAF(entry), &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_time_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    TimeADT     query = PG_GETARG_TIMEADT(1);
 
    /* Oid      subtype = PG_GETARG_OID(3); */
    timeKEY    *kkk = (timeKEY *) 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, &query, GIST_LEAF(entry),
                                      &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_timetz_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    TimeTzADT  *query = PG_GETARG_TIMETZADT_P(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
 
    /* Oid      subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    timeKEY    *kkk = (timeKEY *) DatumGetPointer(entry->key);
    TimeADT     qqq;
    GBT_NUMKEY_R key;
 
    /* All cases served by this function are inexact */
    *recheck = true;
 
    qqq = query->time + (query->zone * INT64CONST(1000000));
 
    key.lower = (GBT_NUMKEY *) &kkk->lower;
    key.upper = (GBT_NUMKEY *) &kkk->upper;
 
    PG_RETURN_BOOL(gbt_num_consistent(&key, &qqq, &strategy,
                                      GIST_LEAF(entry), &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_time_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc(sizeof(timeKEY));
 
    *(int *) PG_GETARG_POINTER(1) = sizeof(timeKEY);
    PG_RETURN_POINTER(gbt_num_union(out, entryvec, &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_time_penalty(PG_FUNCTION_ARGS)
{
    timeKEY    *origentry = (timeKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    timeKEY    *newentry = (timeKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
    float      *result = (float *) PG_GETARG_POINTER(2);
    Interval   *intr;
    double      res;
    double      res2;
 
    intr = DatumGetIntervalP(DirectFunctionCall2(time_mi_time,
                                                 TimeADTGetDatum(newentry->upper),
                                                 TimeADTGetDatum(origentry->upper)));
    res = INTERVAL_TO_SEC(intr);
    res = Max(res, 0);
 
    intr = DatumGetIntervalP(DirectFunctionCall2(time_mi_time,
                                                 TimeADTGetDatum(origentry->lower),
                                                 TimeADTGetDatum(newentry->lower)));
    res2 = INTERVAL_TO_SEC(intr);
    res2 = Max(res2, 0);
 
    res += res2;
 
    *result = 0.0;
 
    if (res > 0)
    {
        intr = DatumGetIntervalP(DirectFunctionCall2(time_mi_time,
                                                     TimeADTGetDatum(origentry->upper),
                                                     TimeADTGetDatum(origentry->lower)));
        *result += FLT_MIN;
        *result += (float) (res / (res + INTERVAL_TO_SEC(intr)));
        *result *= (FLT_MAX / (((GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1));
    }
 
    PG_RETURN_POINTER(result);
}
 
Datum
gbt_time_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(gbt_num_picksplit((GistEntryVector *) PG_GETARG_POINTER(0),
                                        (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
                                        &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_time_same(PG_FUNCTION_ARGS)
{
    timeKEY    *b1 = (timeKEY *) PG_GETARG_POINTER(0);
    timeKEY    *b2 = (timeKEY *) PG_GETARG_POINTER(1);
    bool       *result = (bool *) PG_GETARG_POINTER(2);
 
    *result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
    PG_RETURN_POINTER(result);
}
 
static int
gbt_timekey_ssup_cmp(Datum x, Datum y, SortSupport ssup)
{
    timeKEY    *arg1 = (timeKEY *) DatumGetPointer(x);
    timeKEY    *arg2 = (timeKEY *) DatumGetPointer(y);
 
    /* for leaf items we expect lower == upper, so only compare lower */
    return DatumGetInt32(DirectFunctionCall2(time_cmp,
                                             TimeADTGetDatum(arg1->lower),
                                             TimeADTGetDatum(arg2->lower)));
}
 
Datum
gbt_time_sortsupport(PG_FUNCTION_ARGS)
{
    SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
 
    ssup->comparator = gbt_timekey_ssup_cmp;
    ssup->ssup_extra = NULL;
 
    PG_RETURN_VOID();
}