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postgres/contrib/hstore/hstore_gist.c

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#include "hstore.h"
#include "access/gist.h"
#include "access/itup.h"
/*#include "access/rtree.h"*/
#include "crc32.h"
/* bigint defines */
#define BITBYTE 8
#define SIGLENINT 4 /* >122 => key will toast, so very slow!!! */
#define SIGLEN ( sizeof(int)*SIGLENINT )
#define SIGLENBIT (SIGLEN*BITBYTE)
typedef char BITVEC[SIGLEN];
typedef char *BITVECP;
#define SIGPTR(x) ( (BITVECP) ARR_DATA_PTR(x) )
#define LOOPBYTE(a) \
for(i=0;i<SIGLEN;i++) {\
a;\
}
#define LOOPBIT(a) \
for(i=0;i<SIGLENBIT;i++) {\
a;\
}
/* beware of multiple evaluation of arguments to these macros! */
#define GETBYTE(x,i) ( *( (BITVECP)(x) + (int)( (i) / BITBYTE ) ) )
#define GETBITBYTE(x,i) ( (*((char*)(x)) >> (i)) & 0x01 )
#define CLRBIT(x,i) GETBYTE(x,i) &= ~( 0x01 << ( (i) % BITBYTE ) )
#define SETBIT(x,i) GETBYTE(x,i) |= ( 0x01 << ( (i) % BITBYTE ) )
#define GETBIT(x,i) ( (GETBYTE(x,i) >> ( (i) % BITBYTE )) & 0x01 )
#define HASHVAL(val) (((unsigned int)(val)) % SIGLENBIT)
#define HASH(sign, val) SETBIT((sign), HASHVAL(val))
typedef struct {
int4 len;
int4 flag;
char data[1];
} GISTTYPE;
#define ALLISTRUE 0x04
#define ISALLTRUE(x) ( ((GISTTYPE*)x)->flag & ALLISTRUE )
#define GTHDRSIZE ( sizeof(int4)*2 )
#define CALCGTSIZE(flag) ( GTHDRSIZE+(((flag) & ALLISTRUE) ? 0 : SIGLEN) )
#define GETSIGN(x) ( (BITVECP)( (char*)x+GTHDRSIZE ) )
#define SUMBIT(val) ( \
GETBITBYTE((val),0) + \
GETBITBYTE((val),1) + \
GETBITBYTE((val),2) + \
GETBITBYTE((val),3) + \
GETBITBYTE((val),4) + \
GETBITBYTE((val),5) + \
GETBITBYTE((val),6) + \
GETBITBYTE((val),7) \
)
#define GETENTRY(vec,pos) ((GISTTYPE *) DatumGetPointer((vec)->vector[(pos)].key))
#define WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
PG_FUNCTION_INFO_V1(ghstore_in);
Datum ghstore_in(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(ghstore_out);
Datum ghstore_out(PG_FUNCTION_ARGS);
Datum
ghstore_in(PG_FUNCTION_ARGS) {
elog(ERROR, "Not implemented");
PG_RETURN_DATUM(0);
}
Datum
ghstore_out(PG_FUNCTION_ARGS) {
elog(ERROR, "Not implemented");
PG_RETURN_DATUM(0);
}
PG_FUNCTION_INFO_V1(ghstore_consistent);
PG_FUNCTION_INFO_V1(ghstore_compress);
PG_FUNCTION_INFO_V1(ghstore_decompress);
PG_FUNCTION_INFO_V1(ghstore_penalty);
PG_FUNCTION_INFO_V1(ghstore_picksplit);
PG_FUNCTION_INFO_V1(ghstore_union);
PG_FUNCTION_INFO_V1(ghstore_same);
Datum ghstore_consistent(PG_FUNCTION_ARGS);
Datum ghstore_compress(PG_FUNCTION_ARGS);
Datum ghstore_decompress(PG_FUNCTION_ARGS);
Datum ghstore_penalty(PG_FUNCTION_ARGS);
Datum ghstore_picksplit(PG_FUNCTION_ARGS);
Datum ghstore_union(PG_FUNCTION_ARGS);
Datum ghstore_same(PG_FUNCTION_ARGS);
Datum
ghstore_compress(PG_FUNCTION_ARGS) {
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = entry;
if (entry->leafkey) {
GISTTYPE *res = (GISTTYPE*)palloc(CALCGTSIZE(0));
HStore *toastedval = (HStore *) DatumGetPointer(entry->key);
HStore *val = (HStore *) DatumGetPointer(PG_DETOAST_DATUM(entry->key));
HEntry *ptr = ARRPTR(val);
char *words = STRPTR(val);
memset(res,0,CALCGTSIZE(0));
res->len=CALCGTSIZE(0);
while(ptr-ARRPTR(val) < val->size) {
int h;
h = crc32_sz((char*)(words+ptr->pos), ptr->keylen);
HASH( GETSIGN(res), h);
if ( !ptr->valisnull ) {
h = crc32_sz((char *)(words+ptr->pos+ptr->keylen), ptr->vallen);
HASH( GETSIGN(res), h);
}
ptr++;
}
if (val != toastedval)
pfree(val);
retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(res),
entry->rel, entry->page,
entry->offset,
FALSE);
} else if ( !ISALLTRUE(DatumGetPointer(entry->key)) ) {
int4 i;
GISTTYPE *res;
BITVECP sign = GETSIGN(DatumGetPointer(entry->key));
LOOPBYTE(
if ((sign[i] & 0xff) != 0xff)
PG_RETURN_POINTER(retval);
);
res = (GISTTYPE *) palloc(CALCGTSIZE(ALLISTRUE));
res->len = 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);
}
Datum
ghstore_decompress(PG_FUNCTION_ARGS) {
PG_RETURN_DATUM(PG_GETARG_DATUM(0));
}
Datum
ghstore_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);
}
static int4
sizebitvec(BITVECP sign) {
int4 size = 0, i;
LOOPBYTE(
size += SUMBIT(sign);
sign = (BITVECP) (((char *) sign) + 1);
);
return size;
}
static int
hemdistsign(BITVECP a, BITVECP b) {
int i,dist=0;
LOOPBIT(
if ( GETBIT(a,i) != GETBIT(b,i) )
dist++;
);
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) );
}
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
ghstore_union(PG_FUNCTION_ARGS) {
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
int4 len = entryvec->n;
int *size = (int *) PG_GETARG_POINTER(1);
BITVEC base;
int4 i;
int4 flag = 0;
GISTTYPE *result;
MemSet((void *) base, 0, sizeof(BITVEC));
for (i = 0; i < len; i++) {
if (unionkey(base, GETENTRY(entryvec, i))) {
flag = ALLISTRUE;
break;
}
}
len = CALCGTSIZE(flag);
result = (GISTTYPE *) palloc(len);
*size = result->len = len;
result->flag = flag;
if (!ISALLTRUE(result))
memcpy((void *) GETSIGN(result), (void *) base, sizeof(BITVEC));
PG_RETURN_POINTER(result);
}
Datum
ghstore_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 ((SPLITCOST *) a)->cost - ((SPLITCOST *) b)->cost;
}
Datum
ghstore_picksplit(PG_FUNCTION_ARGS) {
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
OffsetNumber maxoff = entryvec->n - 2;
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;
BITVECP ptr;
int i;
SPLITCOST *costvector;
GISTTYPE *_k,
*_j;
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);
datum_l->len = GTHDRSIZE;
datum_l->flag = ALLISTRUE;
} else {
datum_l = (GISTTYPE *) palloc(GTHDRSIZE + SIGLEN);
datum_l->len = 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);
datum_r->len = GTHDRSIZE;
datum_r->flag = ALLISTRUE;
} else {
datum_r = (GISTTYPE *) palloc(GTHDRSIZE + SIGLEN);
datum_r->len = 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, 0.0001)) {
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
ghstore_consistent(PG_FUNCTION_ARGS) {
GISTTYPE *entry = (GISTTYPE*) DatumGetPointer( ((GISTENTRY *) PG_GETARG_POINTER(0))->key );
HStore *query=PG_GETARG_HS(1);
bool res=true;
HEntry *qe = ARRPTR(query);
char *qv = STRPTR(query);
BITVECP sign;
if ( ISALLTRUE(entry) ) {
PG_FREE_IF_COPY(query,1);
PG_RETURN_BOOL(true);
}
sign=GETSIGN(entry);
while(res && qe-ARRPTR(query) < query->size) {
int crc = crc32_sz((char *)(qv + qe->pos), qe->keylen);
if (GETBIT(sign,HASHVAL(crc))) {
if ( !qe->valisnull ) {
crc = crc32_sz((char *)(qv + qe->pos + qe->keylen), qe->vallen);
if ( !GETBIT(sign,HASHVAL(crc)) )
res=false;
}
} else
res=false;
qe++;
}
PG_FREE_IF_COPY(query,1);
PG_RETURN_BOOL(res);
}
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