btree_int4.c

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/*
 * contrib/btree_gist/btree_int4.c
 */
#include "postgres.h"
#include "btree_gist.h"
#include "btree_utils_num.h"
#include "common/int.h"
#include "utils/rel.h"
#include "utils/sortsupport.h"
 
typedef struct int32key
{
    int32       lower;
    int32       upper;
} int32KEY;
 
/* GiST support functions */
PG_FUNCTION_INFO_V1(gbt_int4_compress);
PG_FUNCTION_INFO_V1(gbt_int4_fetch);
PG_FUNCTION_INFO_V1(gbt_int4_union);
PG_FUNCTION_INFO_V1(gbt_int4_picksplit);
PG_FUNCTION_INFO_V1(gbt_int4_consistent);
PG_FUNCTION_INFO_V1(gbt_int4_distance);
PG_FUNCTION_INFO_V1(gbt_int4_penalty);
PG_FUNCTION_INFO_V1(gbt_int4_same);
PG_FUNCTION_INFO_V1(gbt_int4_sortsupport);
 
static bool
gbt_int4gt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const int32 *) a) > *((const int32 *) b));
}
static bool
gbt_int4ge(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const int32 *) a) >= *((const int32 *) b));
}
static bool
gbt_int4eq(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const int32 *) a) == *((const int32 *) b));
}
static bool
gbt_int4le(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const int32 *) a) <= *((const int32 *) b));
}
static bool
gbt_int4lt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const int32 *) a) < *((const int32 *) b));
}
 
static int
gbt_int4key_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
    int32KEY   *ia = (int32KEY *) (((const Nsrt *) a)->t);
    int32KEY   *ib = (int32KEY *) (((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_int4_dist(const void *a, const void *b, FmgrInfo *flinfo)
{
    return GET_FLOAT_DISTANCE(int32, a, b);
}
 
 
static const gbtree_ninfo tinfo =
{
    gbt_t_int4,
    sizeof(int32),
    8,                          /* sizeof(gbtreekey8) */
    gbt_int4gt,
    gbt_int4ge,
    gbt_int4eq,
    gbt_int4le,
    gbt_int4lt,
    gbt_int4key_cmp,
    gbt_int4_dist
};
 
 
PG_FUNCTION_INFO_V1(int4_dist);
Datum
int4_dist(PG_FUNCTION_ARGS)
{
    int32       a = PG_GETARG_INT32(0);
    int32       b = PG_GETARG_INT32(1);
    int32       r;
    int32       ra;
 
    if (pg_sub_s32_overflow(a, b, &r) ||
        r == PG_INT32_MIN)
        ereport(ERROR,
                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                 errmsg("integer out of range")));
 
    ra = abs(r);
 
    PG_RETURN_INT32(ra);
}
 
 
/**************************************************
 * GiST support functions
 **************************************************/
 
Datum
gbt_int4_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 
    PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
}
 
Datum
gbt_int4_fetch(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 
    PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}
 
Datum
gbt_int4_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    int32       query = PG_GETARG_INT32(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
#ifdef NOT_USED
    Oid         subtype = PG_GETARG_OID(3);
#endif
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    int32KEY   *kkk = (int32KEY *) 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_int4_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    int32       query = PG_GETARG_INT32(1);
#ifdef NOT_USED
    Oid         subtype = PG_GETARG_OID(3);
#endif
    int32KEY   *kkk = (int32KEY *) 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_int4_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc(sizeof(int32KEY));
 
    *(int *) PG_GETARG_POINTER(1) = sizeof(int32KEY);
    PG_RETURN_POINTER(gbt_num_union(out, entryvec, &tinfo, fcinfo->flinfo));
}
 
Datum
gbt_int4_penalty(PG_FUNCTION_ARGS)
{
    int32KEY   *origentry = (int32KEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    int32KEY   *newentry = (int32KEY *) 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_int4_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_int4_same(PG_FUNCTION_ARGS)
{
    int32KEY   *b1 = (int32KEY *) PG_GETARG_POINTER(0);
    int32KEY   *b2 = (int32KEY *) 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_int4_ssup_cmp(Datum a, Datum b, SortSupport ssup)
{
    int32KEY   *ia = (int32KEY *) DatumGetPointer(a);
    int32KEY   *ib = (int32KEY *) DatumGetPointer(b);
 
    /* for leaf items we expect lower == upper, so only compare lower */
    if (ia->lower < ib->lower)
        return -1;
    else if (ia->lower > ib->lower)
        return 1;
    else
        return 0;
}
 
Datum
gbt_int4_sortsupport(PG_FUNCTION_ARGS)
{
    SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
 
    ssup->comparator = gbt_int4_ssup_cmp;
    PG_RETURN_VOID();
}