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openGauss-server/contrib/intarray/_intbig_gist.cpp

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/*
* contrib/intarray/_intbig_gist.c
*/
#include "postgres.h"
#include "knl/knl_variable.h"
#include "access/gist.h"
#include "access/skey.h"
#include "_int.h"
#define GETENTRY(vec, pos) ((GISTTYPE*)DatumGetPointer((vec)->vector[(pos)].key))
/*
** _intbig methods
*/
PG_FUNCTION_INFO_V1(g_intbig_consistent);
PG_FUNCTION_INFO_V1(g_intbig_compress);
PG_FUNCTION_INFO_V1(g_intbig_decompress);
PG_FUNCTION_INFO_V1(g_intbig_penalty);
PG_FUNCTION_INFO_V1(g_intbig_picksplit);
PG_FUNCTION_INFO_V1(g_intbig_union);
PG_FUNCTION_INFO_V1(g_intbig_same);
extern "C" Datum g_intbig_consistent(PG_FUNCTION_ARGS);
extern "C" Datum g_intbig_compress(PG_FUNCTION_ARGS);
extern "C" Datum g_intbig_decompress(PG_FUNCTION_ARGS);
extern "C" Datum g_intbig_penalty(PG_FUNCTION_ARGS);
extern "C" Datum g_intbig_picksplit(PG_FUNCTION_ARGS);
extern "C" Datum g_intbig_union(PG_FUNCTION_ARGS);
extern "C" Datum g_intbig_same(PG_FUNCTION_ARGS);
/* Number of one-bits in an unsigned byte */
static const uint8 number_of_ones[256] = {0,
1,
1,
2,
1,
2,
2,
3,
1,
2,
2,
3,
2,
3,
3,
4,
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2,
3,
3,
4,
2,
3,
3,
4,
3,
4,
4,
5,
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2,
2,
3,
2,
3,
3,
4,
2,
3,
3,
4,
3,
4,
4,
5,
2,
3,
3,
4,
3,
4,
4,
5,
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4,
4,
5,
4,
5,
5,
6,
1,
2,
2,
3,
2,
3,
3,
4,
2,
3,
3,
4,
3,
4,
4,
5,
2,
3,
3,
4,
3,
4,
4,
5,
3,
4,
4,
5,
4,
5,
5,
6,
2,
3,
3,
4,
3,
4,
4,
5,
3,
4,
4,
5,
4,
5,
5,
6,
3,
4,
4,
5,
4,
5,
5,
6,
4,
5,
5,
6,
5,
6,
6,
7,
1,
2,
2,
3,
2,
3,
3,
4,
2,
3,
3,
4,
3,
4,
4,
5,
2,
3,
3,
4,
3,
4,
4,
5,
3,
4,
4,
5,
4,
5,
5,
6,
2,
3,
3,
4,
3,
4,
4,
5,
3,
4,
4,
5,
4,
5,
5,
6,
3,
4,
4,
5,
4,
5,
5,
6,
4,
5,
5,
6,
5,
6,
6,
7,
2,
3,
3,
4,
3,
4,
4,
5,
3,
4,
4,
5,
4,
5,
5,
6,
3,
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4,
5,
4,
5,
5,
6,
4,
5,
5,
6,
5,
6,
6,
7,
3,
4,
4,
5,
4,
5,
5,
6,
4,
5,
5,
6,
5,
6,
6,
7,
4,
5,
5,
6,
5,
6,
6,
7,
5,
6,
6,
7,
6,
7,
7,
8};
PG_FUNCTION_INFO_V1(_intbig_in);
extern "C" Datum _intbig_in(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(_intbig_out);
extern "C" Datum _intbig_out(PG_FUNCTION_ARGS);
Datum _intbig_in(PG_FUNCTION_ARGS)
{
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("_intbig_in() not implemented")));
PG_RETURN_DATUM(0);
}
Datum _intbig_out(PG_FUNCTION_ARGS)
{
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("_intbig_out() not implemented")));
PG_RETURN_DATUM(0);
}
/*********************************************************************
** intbig functions
*********************************************************************/
static bool _intbig_overlap(GISTTYPE* a, ArrayType* b)
{
int num = ARRNELEMS(b);
int4* ptr = ARRPTR(b);
CHECKARRVALID(b);
while (num--) {
if (GETBIT(GETSIGN(a), HASHVAL(*ptr)))
return true;
ptr++;
}
return false;
}
static bool _intbig_contains(GISTTYPE* a, ArrayType* b)
{
int num = ARRNELEMS(b);
int4* ptr = ARRPTR(b);
CHECKARRVALID(b);
while (num--) {
if (!GETBIT(GETSIGN(a), HASHVAL(*ptr)))
return false;
ptr++;
}
return true;
}
Datum g_intbig_same(PG_FUNCTION_ARGS)
{
GISTTYPE* a = (GISTTYPE*)PG_GETARG_POINTER(0);
GISTTYPE* b = (GISTTYPE*)PG_GETARG_POINTER(1);
bool* result = (bool*)PG_GETARG_POINTER(2);
if (ISALLTRUE(a) && ISALLTRUE(b))
*result = true;
else if (ISALLTRUE(a))
*result = false;
else if (ISALLTRUE(b))
*result = false;
else {
int4 i;
BITVECP sa = GETSIGN(a), sb = GETSIGN(b);
*result = true;
LOOPBYTE
{
if (sa[i] != sb[i]) {
*result = false;
break;
}
}
}
PG_RETURN_POINTER(result);
}
Datum g_intbig_compress(PG_FUNCTION_ARGS)
{
GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
if (entry->leafkey) {
GISTENTRY* retval = NULL;
ArrayType* in = DatumGetArrayTypeP(entry->key);
int4* ptr = NULL;
int num;
GISTTYPE* res = (GISTTYPE*)palloc0(CALCGTSIZE(0));
CHECKARRVALID(in);
if (ARRISEMPTY(in)) {
ptr = NULL;
num = 0;
} else {
ptr = ARRPTR(in);
num = ARRNELEMS(in);
}
SET_VARSIZE(res, CALCGTSIZE(0));
while (num--) {
HASH(GETSIGN(res), *ptr);
ptr++;
}
retval = (GISTENTRY*)palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(res), entry->rel, entry->page, entry->offset, FALSE);
if (in != DatumGetArrayTypeP(entry->key))
pfree(in);
PG_RETURN_POINTER(retval);
} else if (!ISALLTRUE(DatumGetPointer(entry->key))) {
GISTENTRY* retval = NULL;
int i;
BITVECP sign = GETSIGN(DatumGetPointer(entry->key));
GISTTYPE* res = NULL;
LOOPBYTE
{
if ((sign[i] & 0xff) != 0xff)
PG_RETURN_POINTER(entry);
}
res = (GISTTYPE*)palloc(CALCGTSIZE(ALLISTRUE));
SET_VARSIZE(res, CALCGTSIZE(ALLISTRUE));
res->flag = ALLISTRUE;
retval = (GISTENTRY*)palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(res), entry->rel, entry->page, entry->offset, FALSE);
PG_RETURN_POINTER(retval);
}
PG_RETURN_POINTER(entry);
}
static int4 sizebitvec(BITVECP sign)
{
int4 size = 0, i;
LOOPBYTE
size += number_of_ones[(unsigned char)sign[i]];
return size;
}
static int hemdistsign(BITVECP a, BITVECP b)
{
int i, diff, dist = 0;
LOOPBYTE
{
diff = (unsigned char)(a[i] ^ b[i]);
dist += number_of_ones[diff];
}
return dist;
}
static int hemdist(GISTTYPE* a, GISTTYPE* b)
{
if (ISALLTRUE(a)) {
if (ISALLTRUE(b))
return 0;
else
return SIGLENBIT - sizebitvec(GETSIGN(b));
} else if (ISALLTRUE(b))
return SIGLENBIT - sizebitvec(GETSIGN(a));
return hemdistsign(GETSIGN(a), GETSIGN(b));
}
Datum g_intbig_decompress(PG_FUNCTION_ARGS)
{
PG_RETURN_DATUM(PG_GETARG_DATUM(0));
}
static int4 unionkey(BITVECP sbase, GISTTYPE* add)
{
int4 i;
BITVECP sadd = GETSIGN(add);
if (ISALLTRUE(add))
return 1;
LOOPBYTE
sbase[i] |= sadd[i];
return 0;
}
Datum g_intbig_union(PG_FUNCTION_ARGS)
{
GistEntryVector* entryvec = (GistEntryVector*)PG_GETARG_POINTER(0);
int* size = (int*)PG_GETARG_POINTER(1);
BITVEC base;
int4 i, len;
int4 flag = 0;
GISTTYPE* result = NULL;
MemSet((void*)base, 0, sizeof(BITVEC));
for (i = 0; i < entryvec->n; i++) {
if (unionkey(base, GETENTRY(entryvec, i))) {
flag = ALLISTRUE;
break;
}
}
len = CALCGTSIZE(flag);
result = (GISTTYPE*)palloc(len);
SET_VARSIZE(result, len);
result->flag = flag;
if (!ISALLTRUE(result))
memcpy((void*)GETSIGN(result), (void*)base, sizeof(BITVEC));
*size = len;
PG_RETURN_POINTER(result);
}
Datum g_intbig_penalty(PG_FUNCTION_ARGS)
{
GISTENTRY* origentry = (GISTENTRY*)PG_GETARG_POINTER(0); /* always ISSIGNKEY */
GISTENTRY* newentry = (GISTENTRY*)PG_GETARG_POINTER(1);
float* penalty = (float*)PG_GETARG_POINTER(2);
GISTTYPE* origval = (GISTTYPE*)DatumGetPointer(origentry->key);
GISTTYPE* newval = (GISTTYPE*)DatumGetPointer(newentry->key);
*penalty = hemdist(origval, newval);
PG_RETURN_POINTER(penalty);
}
typedef struct {
OffsetNumber pos;
int4 cost;
} SPLITCOST;
static int comparecost(const void* a, const void* b)
{
return ((const SPLITCOST*)a)->cost - ((const SPLITCOST*)b)->cost;
}
Datum g_intbig_picksplit(PG_FUNCTION_ARGS)
{
GistEntryVector* entryvec = (GistEntryVector*)PG_GETARG_POINTER(0);
GIST_SPLITVEC* v = (GIST_SPLITVEC*)PG_GETARG_POINTER(1);
OffsetNumber k, j;
GISTTYPE *datum_l, *datum_r;
BITVECP union_l, union_r;
int4 size_alpha, size_beta;
int4 size_waste, waste = -1;
int4 nbytes;
OffsetNumber seed_1 = 0, seed_2 = 0;
OffsetNumber *left, *right;
OffsetNumber maxoff;
BITVECP ptr;
int i;
SPLITCOST* costvector = NULL;
GISTTYPE *_k, *_j;
maxoff = entryvec->n - 2;
nbytes = (maxoff + 2) * sizeof(OffsetNumber);
v->spl_left = (OffsetNumber*)palloc(nbytes);
v->spl_right = (OffsetNumber*)palloc(nbytes);
for (k = FirstOffsetNumber; k < maxoff; k = OffsetNumberNext(k)) {
_k = GETENTRY(entryvec, k);
for (j = OffsetNumberNext(k); j <= maxoff; j = OffsetNumberNext(j)) {
size_waste = hemdist(_k, GETENTRY(entryvec, j));
if (size_waste > waste) {
waste = size_waste;
seed_1 = k;
seed_2 = j;
}
}
}
left = v->spl_left;
v->spl_nleft = 0;
right = v->spl_right;
v->spl_nright = 0;
if (seed_1 == 0 || seed_2 == 0) {
seed_1 = 1;
seed_2 = 2;
}
/* form initial .. */
if (ISALLTRUE(GETENTRY(entryvec, seed_1))) {
datum_l = (GISTTYPE*)palloc(GTHDRSIZE);
SET_VARSIZE(datum_l, GTHDRSIZE);
datum_l->flag = ALLISTRUE;
} else {
datum_l = (GISTTYPE*)palloc(GTHDRSIZE + SIGLEN);
SET_VARSIZE(datum_l, GTHDRSIZE + SIGLEN);
datum_l->flag = 0;
memcpy((void*)GETSIGN(datum_l), (void*)GETSIGN(GETENTRY(entryvec, seed_1)), sizeof(BITVEC));
}
if (ISALLTRUE(GETENTRY(entryvec, seed_2))) {
datum_r = (GISTTYPE*)palloc(GTHDRSIZE);
SET_VARSIZE(datum_r, GTHDRSIZE);
datum_r->flag = ALLISTRUE;
} else {
datum_r = (GISTTYPE*)palloc(GTHDRSIZE + SIGLEN);
SET_VARSIZE(datum_r, GTHDRSIZE + SIGLEN);
datum_r->flag = 0;
memcpy((void*)GETSIGN(datum_r), (void*)GETSIGN(GETENTRY(entryvec, seed_2)), sizeof(BITVEC));
}
maxoff = OffsetNumberNext(maxoff);
/* sort before ... */
costvector = (SPLITCOST*)palloc(sizeof(SPLITCOST) * maxoff);
for (j = FirstOffsetNumber; j <= maxoff; j = OffsetNumberNext(j)) {
costvector[j - 1].pos = j;
_j = GETENTRY(entryvec, j);
size_alpha = hemdist(datum_l, _j);
size_beta = hemdist(datum_r, _j);
costvector[j - 1].cost = Abs(size_alpha - size_beta);
}
qsort((void*)costvector, maxoff, sizeof(SPLITCOST), comparecost);
union_l = GETSIGN(datum_l);
union_r = GETSIGN(datum_r);
for (k = 0; k < maxoff; k++) {
j = costvector[k].pos;
if (j == seed_1) {
*left++ = j;
v->spl_nleft++;
continue;
} else if (j == seed_2) {
*right++ = j;
v->spl_nright++;
continue;
}
_j = GETENTRY(entryvec, j);
size_alpha = hemdist(datum_l, _j);
size_beta = hemdist(datum_r, _j);
if (size_alpha < size_beta + WISH_F(v->spl_nleft, v->spl_nright, 0.00001)) {
if (ISALLTRUE(datum_l) || ISALLTRUE(_j)) {
if (!ISALLTRUE(datum_l))
MemSet((void*)union_l, 0xff, sizeof(BITVEC));
} else {
ptr = GETSIGN(_j);
LOOPBYTE
union_l[i] |= ptr[i];
}
*left++ = j;
v->spl_nleft++;
} else {
if (ISALLTRUE(datum_r) || ISALLTRUE(_j)) {
if (!ISALLTRUE(datum_r))
MemSet((void*)union_r, 0xff, sizeof(BITVEC));
} else {
ptr = GETSIGN(_j);
LOOPBYTE
union_r[i] |= ptr[i];
}
*right++ = j;
v->spl_nright++;
}
}
*right = *left = FirstOffsetNumber;
pfree(costvector);
v->spl_ldatum = PointerGetDatum(datum_l);
v->spl_rdatum = PointerGetDatum(datum_r);
PG_RETURN_POINTER(v);
}
Datum g_intbig_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
ArrayType* query = PG_GETARG_ARRAYTYPE_P(1);
StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);
bool* recheck = (bool*)PG_GETARG_POINTER(4);
bool retval = false;
/* All cases served by this function are inexact */
*recheck = true;
if (ISALLTRUE(DatumGetPointer(entry->key)))
PG_RETURN_BOOL(true);
if (strategy == BooleanSearchStrategy) {
retval = signconsistent((QUERYTYPE*)query, GETSIGN(DatumGetPointer(entry->key)), false);
PG_FREE_IF_COPY(query, 1);
PG_RETURN_BOOL(retval);
}
CHECKARRVALID(query);
switch (strategy) {
case RTOverlapStrategyNumber:
retval = _intbig_overlap((GISTTYPE*)DatumGetPointer(entry->key), query);
break;
case RTSameStrategyNumber:
if (GIST_LEAF(entry)) {
int i, num = ARRNELEMS(query);
int4* ptr = ARRPTR(query);
BITVEC qp;
BITVECP dq, de;
memset(qp, 0, sizeof(BITVEC));
while (num--) {
HASH(qp, *ptr);
ptr++;
}
de = GETSIGN((GISTTYPE*)DatumGetPointer(entry->key));
dq = qp;
retval = true;
LOOPBYTE
{
if (de[i] != dq[i]) {
retval = false;
break;
}
}
} else
retval = _intbig_contains((GISTTYPE*)DatumGetPointer(entry->key), query);
break;
case RTContainsStrategyNumber:
case RTOldContainsStrategyNumber:
retval = _intbig_contains((GISTTYPE*)DatumGetPointer(entry->key), query);
break;
case RTContainedByStrategyNumber:
case RTOldContainedByStrategyNumber:
if (GIST_LEAF(entry)) {
int i, num = ARRNELEMS(query);
int4* ptr = ARRPTR(query);
BITVEC qp;
BITVECP dq, de;
memset(qp, 0, sizeof(BITVEC));
while (num--) {
HASH(qp, *ptr);
ptr++;
}
de = GETSIGN((GISTTYPE*)DatumGetPointer(entry->key));
dq = qp;
retval = true;
LOOPBYTE
{
if (de[i] & ~dq[i]) {
retval = false;
break;
}
}
} else
retval = _intbig_overlap((GISTTYPE*)DatumGetPointer(entry->key), query);
break;
default:
retval = FALSE;
}
PG_FREE_IF_COPY(query, 1);
PG_RETURN_BOOL(retval);
}
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