btree_interval.c

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

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/timestamp.h"

typedef struct
{
    Interval    lower,
                upper;
} intvKEY;


/*
** Interval ops
*/
PG_FUNCTION_INFO_V1(gbt_intv_compress);
PG_FUNCTION_INFO_V1(gbt_intv_decompress);
PG_FUNCTION_INFO_V1(gbt_intv_union);
PG_FUNCTION_INFO_V1(gbt_intv_picksplit);
PG_FUNCTION_INFO_V1(gbt_intv_consistent);
PG_FUNCTION_INFO_V1(gbt_intv_distance);
PG_FUNCTION_INFO_V1(gbt_intv_penalty);
PG_FUNCTION_INFO_V1(gbt_intv_same);

Datum       gbt_intv_compress(PG_FUNCTION_ARGS);
Datum       gbt_intv_decompress(PG_FUNCTION_ARGS);
Datum       gbt_intv_union(PG_FUNCTION_ARGS);
Datum       gbt_intv_picksplit(PG_FUNCTION_ARGS);
Datum       gbt_intv_consistent(PG_FUNCTION_ARGS);
Datum       gbt_intv_distance(PG_FUNCTION_ARGS);
Datum       gbt_intv_penalty(PG_FUNCTION_ARGS);
Datum       gbt_intv_same(PG_FUNCTION_ARGS);


static bool
gbt_intvgt(const void *a, const void *b)
{
    return DatumGetBool(DirectFunctionCall2(interval_gt, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static bool
gbt_intvge(const void *a, const void *b)
{
    return DatumGetBool(DirectFunctionCall2(interval_ge, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static bool
gbt_intveq(const void *a, const void *b)
{
    return DatumGetBool(DirectFunctionCall2(interval_eq, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static bool
gbt_intvle(const void *a, const void *b)
{
    return DatumGetBool(DirectFunctionCall2(interval_le, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static bool
gbt_intvlt(const void *a, const void *b)
{
    return DatumGetBool(DirectFunctionCall2(interval_lt, IntervalPGetDatum(a), IntervalPGetDatum(b)));
}

static int
gbt_intvkey_cmp(const void *a, const void *b)
{
    intvKEY    *ia = (intvKEY *) (((const Nsrt *) a)->t);
    intvKEY    *ib = (intvKEY *) (((const Nsrt *) b)->t);
    int         res;

    res = DatumGetInt32(DirectFunctionCall2(interval_cmp, IntervalPGetDatum(&ia->lower), IntervalPGetDatum(&ib->lower)));
    if (res == 0)
        return DatumGetInt32(DirectFunctionCall2(interval_cmp, IntervalPGetDatum(&ia->upper), IntervalPGetDatum(&ib->upper)));

    return res;
}


static double
intr2num(const Interval *i)
{
    return INTERVAL_TO_SEC(i);
}

static float8
gbt_intv_dist(const void *a, const void *b)
{
    return (float8) Abs(intr2num((const Interval *) a) - intr2num((const Interval *) b));
}

/*
 * INTERVALSIZE should be the actual size-on-disk of an Interval, as shown
 * in pg_type.  This might be less than sizeof(Interval) if the compiler
 * insists on adding alignment padding at the end of the struct.
 */
#define INTERVALSIZE 16

static const gbtree_ninfo tinfo =
{
    gbt_t_intv,
    sizeof(Interval),
    gbt_intvgt,
    gbt_intvge,
    gbt_intveq,
    gbt_intvle,
    gbt_intvlt,
    gbt_intvkey_cmp,
    gbt_intv_dist
};


Interval *
abs_interval(Interval *a)
{
    static Interval zero = {0, 0, 0};

    if (DatumGetBool(DirectFunctionCall2(interval_lt,
                                         IntervalPGetDatum(a),
                                         IntervalPGetDatum(&zero))))
        a = DatumGetIntervalP(DirectFunctionCall1(interval_um,
                                                  IntervalPGetDatum(a)));

    return a;
}

PG_FUNCTION_INFO_V1(interval_dist);
Datum       interval_dist(PG_FUNCTION_ARGS);
Datum
interval_dist(PG_FUNCTION_ARGS)
{
    Datum       diff = DirectFunctionCall2(interval_mi,
                                           PG_GETARG_DATUM(0),
                                           PG_GETARG_DATUM(1));

    PG_RETURN_INTERVAL_P(abs_interval(DatumGetIntervalP(diff)));
}


/**************************************************
 * interval ops
 **************************************************/


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

    if (entry->leafkey || INTERVALSIZE != sizeof(Interval))
    {
        char       *r = (char *) palloc(2 * INTERVALSIZE);

        retval = palloc(sizeof(GISTENTRY));

        if (entry->leafkey)
        {
            Interval   *key = DatumGetIntervalP(entry->key);

            memcpy((void *) r, (void *) key, INTERVALSIZE);
            memcpy((void *) (r + INTERVALSIZE), (void *) key, INTERVALSIZE);
        }
        else
        {
            intvKEY    *key = (intvKEY *) DatumGetPointer(entry->key);

            memcpy(r, &key->lower, INTERVALSIZE);
            memcpy(r + INTERVALSIZE, &key->upper, INTERVALSIZE);
        }
        gistentryinit(*retval, PointerGetDatum(r),
                      entry->rel, entry->page,
                      entry->offset, FALSE);
    }

    PG_RETURN_POINTER(retval);

}

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

    if (INTERVALSIZE != sizeof(Interval))
    {
        intvKEY    *r = palloc(sizeof(intvKEY));
        char       *key = DatumGetPointer(entry->key);

        retval = palloc(sizeof(GISTENTRY));
        memcpy(&r->lower, key, INTERVALSIZE);
        memcpy(&r->upper, key + INTERVALSIZE, INTERVALSIZE);

        gistentryinit(*retval, PointerGetDatum(r),
                      entry->rel, entry->page,
                      entry->offset, FALSE);
    }
    PG_RETURN_POINTER(retval);
}


Datum
gbt_intv_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    Interval   *query = PG_GETARG_INTERVAL_P(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

    /* Oid      subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    intvKEY    *kkk = (intvKEY *) 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_intv_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    Interval   *query = PG_GETARG_INTERVAL_P(1);

    /* Oid      subtype = PG_GETARG_OID(3); */
    intvKEY    *kkk = (intvKEY *) 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_intv_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc(sizeof(intvKEY));

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


Datum
gbt_intv_penalty(PG_FUNCTION_ARGS)
{
    intvKEY    *origentry = (intvKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    intvKEY    *newentry = (intvKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
    float      *result = (float *) PG_GETARG_POINTER(2);
    double      iorg[2],
                inew[2];

    iorg[0] = intr2num(&origentry->lower);
    iorg[1] = intr2num(&origentry->upper);
    inew[0] = intr2num(&newentry->lower);
    inew[1] = intr2num(&newentry->upper);

    penalty_num(result, iorg[0], iorg[1], inew[0], inew[1]);

    PG_RETURN_POINTER(result);

}

Datum
gbt_intv_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(gbt_num_picksplit(
                                    (GistEntryVector *) PG_GETARG_POINTER(0),
                                      (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
                                        &tinfo
                                        ));
}

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

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