btree_enum.c

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/*
 * contrib/btree_gist/btree_enum.c
 */
#include "postgres.h"
#include "fmgr.h"
#include "utils/builtins.h"

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

/* enums are really Oids, so we just use the same structure */

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

/*
** enum ops
*/
PG_FUNCTION_INFO_V1(gbt_enum_compress);
PG_FUNCTION_INFO_V1(gbt_enum_fetch);
PG_FUNCTION_INFO_V1(gbt_enum_union);
PG_FUNCTION_INFO_V1(gbt_enum_picksplit);
PG_FUNCTION_INFO_V1(gbt_enum_consistent);
PG_FUNCTION_INFO_V1(gbt_enum_penalty);
PG_FUNCTION_INFO_V1(gbt_enum_same);


static bool
gbt_enumgt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(
                        CallerFInfoFunctionCall2(enum_gt, flinfo, InvalidOid, ObjectIdGetDatum(*((const Oid *) a)), ObjectIdGetDatum(*((const Oid *) b)))
        );
}
static bool
gbt_enumge(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(
                        CallerFInfoFunctionCall2(enum_ge, flinfo, InvalidOid, ObjectIdGetDatum(*((const Oid *) a)), ObjectIdGetDatum(*((const Oid *) b)))
        );
}
static bool
gbt_enumeq(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const Oid *) a) == *((const Oid *) b));
}
static bool
gbt_enumle(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(
                        CallerFInfoFunctionCall2(enum_le, flinfo, InvalidOid, ObjectIdGetDatum(*((const Oid *) a)), ObjectIdGetDatum(*((const Oid *) b)))
        );
}
static bool
gbt_enumlt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return DatumGetBool(
                        CallerFInfoFunctionCall2(enum_lt, flinfo, InvalidOid, ObjectIdGetDatum(*((const Oid *) a)), ObjectIdGetDatum(*((const Oid *) b)))
        );
}

static int
gbt_enumkey_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 DatumGetInt32(
                             CallerFInfoFunctionCall2(enum_cmp, flinfo, InvalidOid, ObjectIdGetDatum(ia->upper), ObjectIdGetDatum(ib->upper))
            );
    }

    return DatumGetInt32(
                         CallerFInfoFunctionCall2(enum_cmp, flinfo, InvalidOid, ObjectIdGetDatum(ia->lower), ObjectIdGetDatum(ib->lower))
        );
}

static const gbtree_ninfo tinfo =
{
    gbt_t_enum,
    sizeof(Oid),
    8,                          /* sizeof(gbtreekey8) */
    gbt_enumgt,
    gbt_enumge,
    gbt_enumeq,
    gbt_enumle,
    gbt_enumlt,
    gbt_enumkey_cmp,
    NULL                        /* no KNN support at least for now */
};


/**************************************************
 * Enum ops
 **************************************************/


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

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

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

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

Datum
gbt_enum_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_enum_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_enum_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_enum_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_enum_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);
}