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/*
* contrib/btree_gist/btree_enum.c
*/
#include "postgres.h"
#include "btree_gist.h"
#include "btree_utils_num.h"
#include "fmgr.h"
#include "utils/fmgrprotos.h"
#include "utils/fmgroids.h"
#include "utils/sortsupport.h"
/* enums are really Oids, so we just use the same structure */
typedef struct
{
Oid lower;
Oid upper;
} oidKEY;
/* GiST support functions */
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);
PG_FUNCTION_INFO_V1(gbt_enum_sortsupport);
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 */
};
/**************************************************
* GiST support functions
**************************************************/
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, &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(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);
}
static int
gbt_enum_ssup_cmp(Datum x, Datum y, SortSupport ssup)
{
oidKEY *arg1 = (oidKEY *) DatumGetPointer(x);
oidKEY *arg2 = (oidKEY *) DatumGetPointer(y);
/* for leaf items we expect lower == upper, so only compare lower */
return DatumGetInt32(CallerFInfoFunctionCall2(enum_cmp,
ssup->ssup_extra,
InvalidOid,
arg1->lower,
arg2->lower));
}
Datum
gbt_enum_sortsupport(PG_FUNCTION_ARGS)
{
SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
FmgrInfo *flinfo;
ssup->comparator = gbt_enum_ssup_cmp;
/*
* Since gbt_enum_ssup_cmp() uses enum_cmp() like the rest of the
* comparison functions, it also needs to pass flinfo when calling it. The
* caller to a SortSupport comparison function doesn't provide an FmgrInfo
* struct, so look it up now, save it in ssup_extra and use it in
* gbt_enum_ssup_cmp() later.
*/
flinfo = MemoryContextAlloc(ssup->ssup_cxt, sizeof(FmgrInfo));
fmgr_info_cxt(F_ENUM_CMP, flinfo, ssup->ssup_cxt);
ssup->ssup_extra = flinfo;
PG_RETURN_VOID();
}
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