btree_oid.c

/*
 * contrib/btree_gist/btree_oid.c
 */
#include "postgres.h"

#include "btree_gist.h"
#include "btree_utils_num.h"

typedef struct
{
    Oid            lower;
    Oid            upper;
} oidKEY;

/*
** OID ops
*/
PG_FUNCTION_INFO_V1(gbt_oid_compress);
PG_FUNCTION_INFO_V1(gbt_oid_fetch);
PG_FUNCTION_INFO_V1(gbt_oid_union);
PG_FUNCTION_INFO_V1(gbt_oid_picksplit);
PG_FUNCTION_INFO_V1(gbt_oid_consistent);
PG_FUNCTION_INFO_V1(gbt_oid_distance);
PG_FUNCTION_INFO_V1(gbt_oid_penalty);
PG_FUNCTION_INFO_V1(gbt_oid_same);


static bool
gbt_oidgt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Oid *) a) > *((const Oid *) b));
}
static bool
gbt_oidge(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Oid *) a) >= *((const Oid *) b));
}
static bool
gbt_oideq(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Oid *) a) == *((const Oid *) b));
}
static bool
gbt_oidle(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Oid *) a) <= *((const Oid *) b));
}
static bool
gbt_oidlt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Oid *) a) < *((const Oid *) b));
}

static int
gbt_oidkey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
    oidKEY       *ia = (oidKEY *) (((const Nsrt *) a)->t);
    oidKEY       *ib = (oidKEY *) (((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_oid_dist(const void *a, const void *b, FmgrInfo *flinfo)
{
    Oid            aa = *(const Oid *) a;
    Oid            bb = *(const Oid *) b;

    if (aa < bb)
        return (float8) (bb - aa);
    else
        return (float8) (aa - bb);
}


static const gbtree_ninfo tinfo =
{
    gbt_t_oid,
    sizeof(Oid),
    8,                            /* sizeof(gbtreekey8) */
    gbt_oidgt,
    gbt_oidge,
    gbt_oideq,
    gbt_oidle,
    gbt_oidlt,
    gbt_oidkey_cmp,
    gbt_oid_dist
};


PG_FUNCTION_INFO_V1(oid_dist);
Datum
oid_dist(PG_FUNCTION_ARGS)
{
    Oid            a = PG_GETARG_OID(0);
    Oid            b = PG_GETARG_OID(1);
    Oid            res;

    if (a < b)
        res = b - a;
    else
        res = a - b;
    PG_RETURN_OID(res);
}


/**************************************************
 * Oid ops
 **************************************************/


Datum
gbt_oid_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

    PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
}

Datum
gbt_oid_fetch(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

    PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}

Datum
gbt_oid_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    Oid            query = PG_GETARG_OID(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

    /* Oid        subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    oidKEY       *kkk = (oidKEY *) 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, fcinfo->flinfo)
        );
}


Datum
gbt_oid_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    Oid            query = PG_GETARG_OID(1);

    /* Oid        subtype = PG_GETARG_OID(3); */
    oidKEY       *kkk = (oidKEY *) 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, fcinfo->flinfo)
        );
}


Datum
gbt_oid_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc(sizeof(oidKEY));

    *(int *) PG_GETARG_POINTER(1) = sizeof(oidKEY);
    PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
}


Datum
gbt_oid_penalty(PG_FUNCTION_ARGS)
{
    oidKEY       *origentry = (oidKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    oidKEY       *newentry = (oidKEY *) 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_oid_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_oid_same(PG_FUNCTION_ARGS)
{
    oidKEY       *b1 = (oidKEY *) PG_GETARG_POINTER(0);
    oidKEY       *b2 = (oidKEY *) 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);
}