btree_float8.c

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/*
 * contrib/btree_gist/btree_float8.c
 */
#include "postgres.h"

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

typedef struct float8key
{
    float8      lower;
    float8      upper;
} float8KEY;

/*
** float8 ops
*/
PG_FUNCTION_INFO_V1(gbt_float8_compress);
PG_FUNCTION_INFO_V1(gbt_float8_union);
PG_FUNCTION_INFO_V1(gbt_float8_picksplit);
PG_FUNCTION_INFO_V1(gbt_float8_consistent);
PG_FUNCTION_INFO_V1(gbt_float8_distance);
PG_FUNCTION_INFO_V1(gbt_float8_penalty);
PG_FUNCTION_INFO_V1(gbt_float8_same);

Datum       gbt_float8_compress(PG_FUNCTION_ARGS);
Datum       gbt_float8_union(PG_FUNCTION_ARGS);
Datum       gbt_float8_picksplit(PG_FUNCTION_ARGS);
Datum       gbt_float8_consistent(PG_FUNCTION_ARGS);
Datum       gbt_float8_distance(PG_FUNCTION_ARGS);
Datum       gbt_float8_penalty(PG_FUNCTION_ARGS);
Datum       gbt_float8_same(PG_FUNCTION_ARGS);


static bool
gbt_float8gt(const void *a, const void *b)
{
    return (*((const float8 *) a) > *((const float8 *) b));
}
static bool
gbt_float8ge(const void *a, const void *b)
{
    return (*((const float8 *) a) >= *((const float8 *) b));
}
static bool
gbt_float8eq(const void *a, const void *b)
{
    return (*((const float8 *) a) == *((const float8 *) b));
}
static bool
gbt_float8le(const void *a, const void *b)
{
    return (*((const float8 *) a) <= *((const float8 *) b));
}
static bool
gbt_float8lt(const void *a, const void *b)
{
    return (*((const float8 *) a) < *((const float8 *) b));
}

static int
gbt_float8key_cmp(const void *a, const void *b)
{
    float8KEY  *ia = (float8KEY *) (((const Nsrt *) a)->t);
    float8KEY  *ib = (float8KEY *) (((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_float8_dist(const void *a, const void *b)
{
    float8      arg1 = *(const float8 *) a;
    float8      arg2 = *(const float8 *) b;
    float8      r;

    r = arg1 - arg2;
    CHECKFLOATVAL(r, isinf(arg1) || isinf(arg2), true);

    return Abs(r);
}


static const gbtree_ninfo tinfo =
{
    gbt_t_float8,
    sizeof(float8),
    gbt_float8gt,
    gbt_float8ge,
    gbt_float8eq,
    gbt_float8le,
    gbt_float8lt,
    gbt_float8key_cmp,
    gbt_float8_dist
};


PG_FUNCTION_INFO_V1(float8_dist);
Datum       float8_dist(PG_FUNCTION_ARGS);
Datum
float8_dist(PG_FUNCTION_ARGS)
{
    float8      a = PG_GETARG_FLOAT8(0);
    float8      b = PG_GETARG_FLOAT8(1);
    float8      r;

    r = a - b;
    CHECKFLOATVAL(r, isinf(a) || isinf(b), true);

    PG_RETURN_FLOAT8(Abs(r));
}

/**************************************************
 * float8 ops
 **************************************************/


Datum
gbt_float8_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_float8_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    float8      query = PG_GETARG_FLOAT8(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

    /* Oid      subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    float8KEY  *kkk = (float8KEY *) 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)
        );
}


Datum
gbt_float8_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    float8      query = PG_GETARG_FLOAT8(1);

    /* Oid      subtype = PG_GETARG_OID(3); */
    float8KEY  *kkk = (float8KEY *) 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)
        );
}


Datum
gbt_float8_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc(sizeof(float8KEY));

    *(int *) PG_GETARG_POINTER(1) = sizeof(float8KEY);
    PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo));
}


Datum
gbt_float8_penalty(PG_FUNCTION_ARGS)
{
    float8KEY  *origentry = (float8KEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    float8KEY  *newentry = (float8KEY *) 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_float8_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(gbt_num_picksplit(
                                    (GistEntryVector *) PG_GETARG_POINTER(0),
                                      (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
                                        &tinfo
                                        ));
}

Datum
gbt_float8_same(PG_FUNCTION_ARGS)
{
    float8KEY  *b1 = (float8KEY *) PG_GETARG_POINTER(0);
    float8KEY  *b2 = (float8KEY *) PG_GETARG_POINTER(1);
    bool       *result = (bool *) PG_GETARG_POINTER(2);

    *result = gbt_num_same((void *) b1, (void *) b2, &tinfo);
    PG_RETURN_POINTER(result);
}