btree_cash.c

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/*
 * contrib/btree_gist/btree_cash.c
 */
#include "postgres.h"
 
#include "btree_gist.h"
#include "btree_utils_num.h"
#include "common/int.h"
#include "utils/cash.h"
#include "utils/rel.h"
#include "utils/sortsupport.h"
 
typedef struct
{
    Cash        lower;
    Cash        upper;
} cashKEY;
 
/* GiST support functions */
PG_FUNCTION_INFO_V1(gbt_cash_compress);
PG_FUNCTION_INFO_V1(gbt_cash_fetch);
PG_FUNCTION_INFO_V1(gbt_cash_union);
PG_FUNCTION_INFO_V1(gbt_cash_picksplit);
PG_FUNCTION_INFO_V1(gbt_cash_consistent);
PG_FUNCTION_INFO_V1(gbt_cash_distance);
PG_FUNCTION_INFO_V1(gbt_cash_penalty);
PG_FUNCTION_INFO_V1(gbt_cash_same);
PG_FUNCTION_INFO_V1(gbt_cash_sortsupport);
 
static bool
gbt_cashgt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Cash *) a) > *((const Cash *) b));
}
static bool
gbt_cashge(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Cash *) a) >= *((const Cash *) b));
}
static bool
gbt_casheq(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Cash *) a) == *((const Cash *) b));
}
static bool
gbt_cashle(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Cash *) a) <= *((const Cash *) b));
}
static bool
gbt_cashlt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Cash *) a) < *((const Cash *) b));
}
 
static int
gbt_cashkey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
    cashKEY    *ia = (cashKEY *) (((const Nsrt *) a)->t);
    cashKEY    *ib = (cashKEY *) (((const Nsrt *) b)->t);
 
    if (ia->lower == ib->lower)
    {
        if (ia->upper == ib->upper)
            return 0;
 
        return (ia->upper > ib->upper) ? 1 : -1;
    }
 
    return (ia->lower > ib->lower) ? 1 : -1;
}
 
static float8
gbt_cash_dist(const void *a, const void *b, FmgrInfo *flinfo)
{
    return GET_FLOAT_DISTANCE(Cash, a, b);
}
 
 
static const gbtree_ninfo tinfo =
{
    gbt_t_cash,
    sizeof(Cash),
    16,                         /* sizeof(gbtreekey16) */
    gbt_cashgt,
    gbt_cashge,
    gbt_casheq,
    gbt_cashle,
    gbt_cashlt,
    gbt_cashkey_cmp,
    gbt_cash_dist
};
 
 
PG_FUNCTION_INFO_V1(cash_dist);
Datum
cash_dist(PG_FUNCTION_ARGS)
{
    Cash        a = PG_GETARG_CASH(0);
    Cash        b = PG_GETARG_CASH(1);
    Cash        r;
    Cash        ra;
 
    if (pg_sub_s64_overflow(a, b, &r) ||
        r == PG_INT64_MIN)
        ereport(ERROR,
                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                 errmsg("money out of range")));
 
    ra = i64abs(r);
 
    PG_RETURN_CASH(ra);
}
 
 
/**************************************************
 * GiST support functions
 **************************************************/
 
Datum
gbt_cash_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 
    PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
}
 
Datum
gbt_cash_fetch(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 
    PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}
 
Datum
gbt_cash_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    Cash        query = PG_GETARG_CASH(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
 
    /* Oid      subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    cashKEY    *kkk = (cashKEY *) 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_cash_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    Cash        query = PG_GETARG_CASH(1);
 
    /* Oid      subtype = PG_GETARG_OID(3); */
    cashKEY    *kkk = (cashKEY *) 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_cash_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc(sizeof(cashKEY));
 
    *(int *) PG_GETARG_POINTER(1) = sizeof(cashKEY);
    PG_RETURN_POINTER(gbt_num_union(out, entryvec, &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_cash_penalty(PG_FUNCTION_ARGS)
{
    cashKEY    *origentry = (cashKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    cashKEY    *newentry = (cashKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
    float      *result = (float *) PG_GETARG_POINTER(2);
 
    penalty_num(result, origentry->lower, origentry->upper, newentry->lower, newentry->upper);
 
    PG_RETURN_POINTER(result);
}
 
Datum
gbt_cash_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_cash_same(PG_FUNCTION_ARGS)
{
    cashKEY    *b1 = (cashKEY *) PG_GETARG_POINTER(0);
    cashKEY    *b2 = (cashKEY *) 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_cash_ssup_cmp(Datum x, Datum y, SortSupport ssup)
{
    cashKEY    *arg1 = (cashKEY *) DatumGetPointer(x);
    cashKEY    *arg2 = (cashKEY *) DatumGetPointer(y);
 
    /* for leaf items we expect lower == upper, so only compare lower */
    if (arg1->lower > arg2->lower)
        return 1;
    else if (arg1->lower < arg2->lower)
        return -1;
    else
        return 0;
}
 
Datum
gbt_cash_sortsupport(PG_FUNCTION_ARGS)
{
    SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
 
    ssup->comparator = gbt_cash_ssup_cmp;
    ssup->ssup_extra = NULL;
 
    PG_RETURN_VOID();
}