postgresql/contrib/ltree/_ltree_gist.c

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/*
* GiST support for ltree[]
* Teodor Sigaev <teodor@stack.net>
*/
#include "ltree.h"
#include "access/gist.h"
#include "access/rtree.h"
#include "access/nbtree.h"
#include "utils/array.h"
#include "crc32.h"
PG_FUNCTION_INFO_V1( _ltree_compress );
Datum _ltree_compress(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1( _ltree_same );
Datum _ltree_same(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1( _ltree_union );
Datum _ltree_union(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1( _ltree_penalty );
Datum _ltree_penalty(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1( _ltree_picksplit );
Datum _ltree_picksplit(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1( _ltree_consistent );
Datum _ltree_consistent(PG_FUNCTION_ARGS);
#define GETENTRY(vec,pos) ((ltree_gist *) DatumGetPointer(((GISTENTRY *) VARDATA(vec))[(pos)].key))
#define NEXTVAL(x) ( (ltree*)( (char*)(x) + INTALIGN( VARSIZE(x) ) ) )
#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 WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
static void
hashing(BITVECP sign, ltree *t) {
int tlen = t->numlevel;
ltree_level *cur = LTREE_FIRST(t);
int hash;
while(tlen > 0) {
hash = ltree_crc32_sz( cur->name, cur->len );
AHASH( sign, hash );
cur = LEVEL_NEXT(cur);
tlen--;
}
}
Datum
_ltree_compress(PG_FUNCTION_ARGS) {
GISTENTRY *entry = (GISTENTRY *)PG_GETARG_POINTER(0);
GISTENTRY *retval = entry;
if ( entry->leafkey ) { /* ltree */
ltree_gist *key;
ArrayType *val = (ArrayType*)DatumGetPointer(PG_DETOAST_DATUM(entry->key));
int4 len = LTG_HDRSIZE + ASIGLEN;
int num=ArrayGetNItems( ARR_NDIM(val), ARR_DIMS(val) );
ltree *item = (ltree*)ARR_DATA_PTR(val);
if ( ARR_NDIM(val) != 1 )
elog(ERROR,"Dimension of array != 1");
key = (ltree_gist*)palloc( len );
key->len = len;
key->flag = 0;
MemSet( LTG_SIGN(key), 0, sizeof(ASIGLEN) );
while( num>0 ) {
hashing(LTG_SIGN(key), item);
num--;
item = NEXTVAL(item);
}
if ( PointerGetDatum(val) != entry->key )
pfree(val);
retval = (GISTENTRY*)palloc( sizeof(GISTENTRY) );
gistentryinit(*retval, PointerGetDatum(key),
entry->rel, entry->page,
entry->offset, key->len, FALSE);
} else {
int4 i,len;
ltree_gist *key;
BITVECP sign = LTG_SIGN(DatumGetPointer( entry->key ) );
ALOOPBYTE(
if ( sign[i] != 0xff )
PG_RETURN_POINTER(retval);
);
len = LTG_HDRSIZE;
key = (ltree_gist*)palloc( len );
key->len = len;
key->flag = LTG_ALLTRUE;
retval = (GISTENTRY*)palloc( sizeof(GISTENTRY) );
gistentryinit(*retval, PointerGetDatum(key),
entry->rel, entry->page,
entry->offset, key->len, FALSE);
}
PG_RETURN_POINTER(retval);
}
Datum
_ltree_same(PG_FUNCTION_ARGS) {
ltree_gist* a=(ltree_gist*)PG_GETARG_POINTER(0);
ltree_gist* b=(ltree_gist*)PG_GETARG_POINTER(1);
bool *result = (bool *)PG_GETARG_POINTER(2);
if ( LTG_ISALLTRUE(a) && LTG_ISALLTRUE(b) ) {
*result = true;
} else if ( LTG_ISALLTRUE(a) ) {
*result = false;
} else if ( LTG_ISALLTRUE(b) ) {
*result = false;
} else {
int4 i;
BITVECP sa=LTG_SIGN(a), sb=LTG_SIGN(b);
*result = true;
ALOOPBYTE(
if ( sa[i] != sb[i] ) {
*result = false;
break;
}
);
}
PG_RETURN_POINTER(result);
}
static int4
unionkey( BITVECP sbase, ltree_gist *add ) {
int4 i;
BITVECP sadd = LTG_SIGN( add );
if ( LTG_ISALLTRUE(add) )
return 1;
ALOOPBYTE(
sbase[i] |= sadd[i];
);
return 0;
}
Datum
_ltree_union(PG_FUNCTION_ARGS) {
bytea *entryvec = (bytea *) PG_GETARG_POINTER(0);
int *size = (int *) PG_GETARG_POINTER(1);
ABITVEC base;
int4 len = (VARSIZE(entryvec) - VARHDRSZ) / sizeof(GISTENTRY);
int4 i;
int4 flag = 0;
ltree_gist *result;
MemSet( (void*)base, 0, sizeof(ABITVEC) );
for(i=0;i<len;i++) {
if ( unionkey( base, GETENTRY(entryvec, i) ) ) {
flag = LTG_ALLTRUE;
break;
}
}
len = LTG_HDRSIZE + ( ( flag & LTG_ALLTRUE ) ? 0 : ASIGLEN );
result = (ltree_gist*)palloc( len );
*size = result->len = len;
result->flag = flag;
if ( ! LTG_ISALLTRUE(result) )
memcpy((void*)LTG_SIGN(result), (void*)base, sizeof( ABITVEC ) );
PG_RETURN_POINTER(result);
}
static int4
sizebitvec( BITVECP sign ) {
int4 size=0, i;
ALOOPBYTE(
size += SUMBIT(*(char*)sign);
sign = (BITVECP) ( ((char*)sign) + 1 );
);
return size;
}
Datum
_ltree_penalty(PG_FUNCTION_ARGS) {
ltree_gist *origval = (ltree_gist*)DatumGetPointer( ( (GISTENTRY *)PG_GETARG_POINTER(0) )->key );
ltree_gist *newval = (ltree_gist*)DatumGetPointer( ( (GISTENTRY *)PG_GETARG_POINTER(1) )->key );
float *penalty = (float *) PG_GETARG_POINTER(2);
BITVECP orig = LTG_SIGN(origval);
if ( LTG_ISALLTRUE(origval) ) {
*penalty = 0.0;
PG_RETURN_POINTER( penalty );
}
if ( LTG_ISALLTRUE(newval) ) {
*penalty = (float) (ASIGLENBIT - sizebitvec( orig ) );
} else {
unsigned char valtmp;
BITVECP nval = LTG_SIGN(newval);
int4 i, unionsize=0;
ALOOPBYTE(
valtmp = nval[i] | orig[i];
unionsize += SUMBIT(valtmp) - SUMBIT(orig[i]);
);
*penalty = (float)unionsize;
}
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
_ltree_picksplit(PG_FUNCTION_ARGS) {
bytea *entryvec = (bytea*) PG_GETARG_POINTER(0);
GIST_SPLITVEC *v = (GIST_SPLITVEC*) PG_GETARG_POINTER(1);
OffsetNumber k,j;
ltree_gist *datum_l, *datum_r;
ABITVEC union_l, union_r;
bool firsttime = true;
int4 size_alpha,size_beta,sizeu,sizei;
int4 size_waste, waste = 0.0;
int4 size_l, size_r;
int4 nbytes;
OffsetNumber seed_1=0, seed_2=0;
OffsetNumber *left, *right;
OffsetNumber maxoff;
BITVECP ptra, ptrb, ptrc;
int i;
unsigned char valtmp;
SPLITCOST *costvector;
ltree_gist *_k, *_j;
maxoff = ((VARSIZE(entryvec) - VARHDRSZ) / sizeof(GISTENTRY)) - 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)) {
_j = GETENTRY(entryvec,j);
if ( LTG_ISALLTRUE(_k) || LTG_ISALLTRUE(_j) ) {
sizeu = ASIGLENBIT;
if ( LTG_ISALLTRUE(_k) && LTG_ISALLTRUE(_j) )
sizei = ASIGLENBIT;
else
sizei = ( LTG_ISALLTRUE(_k) ) ?
sizebitvec( LTG_SIGN(_j) ) : sizebitvec( LTG_SIGN(_k) );
} else {
sizeu = sizei = 0;
ptra = LTG_SIGN(_j);
ptrb = LTG_SIGN(_k);
/* critical section for bench !!! */
#define COUNT(pos) do { \
if ( GETBITBYTE(*(char*)ptra,pos) ) { \
sizeu++; \
if ( GETBITBYTE(*(char*)ptrb, pos) ) \
sizei++; \
} else if ( GETBITBYTE(*(char*)ptrb, pos) ) \
sizeu++; \
} while(0)
ALOOPBYTE(
COUNT(0);
COUNT(1);
COUNT(2);
COUNT(3);
COUNT(4);
COUNT(5);
COUNT(6);
COUNT(7);
ptra = (BITVECP) ( ((char*)ptra) + 1 );
ptrb = (BITVECP) ( ((char*)ptrb) + 1 );
);
}
size_waste = sizeu - sizei;
if (size_waste > waste || firsttime) {
waste = size_waste;
seed_1 = k;
seed_2 = j;
firsttime = false;
}
}
}
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 ( LTG_ISALLTRUE(GETENTRY(entryvec,seed_1)) ) {
datum_l = (ltree_gist*)palloc( LTG_HDRSIZE );
datum_l->len = LTG_HDRSIZE; datum_l->flag = LTG_ALLTRUE;
size_l = ASIGLENBIT;
} else {
datum_l = (ltree_gist*)palloc( LTG_HDRSIZE + ASIGLEN );
datum_l->len = LTG_HDRSIZE + ASIGLEN; datum_l->flag = 0;
memcpy((void*)LTG_SIGN(datum_l), (void*)LTG_SIGN(GETENTRY(entryvec,seed_1)), sizeof(ABITVEC));
size_l = sizebitvec( LTG_SIGN(datum_l) );
}
if ( LTG_ISALLTRUE(GETENTRY(entryvec,seed_2)) ) {
datum_r = (ltree_gist*)palloc( LTG_HDRSIZE );
datum_r->len = LTG_HDRSIZE; datum_r->flag = LTG_ALLTRUE;
size_r = ASIGLENBIT;
} else {
datum_r = (ltree_gist*)palloc( LTG_HDRSIZE + ASIGLEN );
datum_r->len = LTG_HDRSIZE + ASIGLEN; datum_r->flag = 0;
memcpy((void*)LTG_SIGN(datum_r), (void*)LTG_SIGN(GETENTRY(entryvec,seed_2)), sizeof(ABITVEC));
size_r = sizebitvec( LTG_SIGN(datum_r) );
}
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);
if ( LTG_ISALLTRUE(_j) ) {
size_alpha = ASIGLENBIT - size_l;
size_beta = ASIGLENBIT - size_r;
} else {
ptra = LTG_SIGN( datum_l );
ptrb = LTG_SIGN( datum_r );
ptrc = LTG_SIGN( _j );
size_beta = size_alpha = 0;
if ( LTG_ISALLTRUE(datum_l) ) {
if ( !LTG_ISALLTRUE(datum_r) ) {
ALOOPBIT(
if ( GETBIT(ptrc,i) && ! GETBIT(ptrb,i) )
size_beta++;
);
}
} else if ( LTG_ISALLTRUE(datum_r) ) {
if ( !LTG_ISALLTRUE(datum_l) ) {
ALOOPBIT(
if ( GETBIT(ptrc,i) && ! GETBIT(ptra,i) )
size_alpha++;
);
}
} else {
ALOOPBIT(
if ( GETBIT(ptrc,i) && ! GETBIT(ptra,i) )
size_alpha++;
if ( GETBIT(ptrc,i) && ! GETBIT(ptrb,i) )
size_beta++;
);
}
}
costvector[j-1].cost = abs( size_alpha - size_beta );
}
qsort( (void*)costvector, maxoff, sizeof(SPLITCOST), comparecost );
for (k = 0; k < maxoff; k++) {
j = costvector[k].pos;
_j = GETENTRY(entryvec,j);
if ( j == seed_1 ) {
*left++ = j;
v->spl_nleft++;
continue;
} else if ( j == seed_2 ) {
*right++ = j;
v->spl_nright++;
continue;
}
if ( LTG_ISALLTRUE(datum_l) || LTG_ISALLTRUE(_j) ) {
size_alpha = ASIGLENBIT;
} else {
ptra = LTG_SIGN(_j);
ptrb = LTG_SIGN(datum_l);
size_alpha = 0;
ALOOPBYTE(
valtmp = union_l[i] = ptra[i] | ptrb[i];
size_alpha += SUMBIT( valtmp );
);
}
if ( LTG_ISALLTRUE(datum_r) || LTG_ISALLTRUE(_j) ) {
size_beta = ASIGLENBIT;
} else {
ptra = LTG_SIGN(_j);
ptrb = LTG_SIGN(datum_r);
size_beta = 0;
ALOOPBYTE(
valtmp = union_r[i] = ptra[i] | ptrb[i];
size_beta += SUMBIT( valtmp );
);
}
if (size_alpha - size_l < size_beta - size_r + WISH_F(v->spl_nleft, v->spl_nright, 0.1)) {
if ( ! LTG_ISALLTRUE( datum_l ) ) {
if ( size_alpha == ASIGLENBIT ) {
if ( size_alpha != size_l )
MemSet( (void*)LTG_SIGN(datum_l),0xff, sizeof(ABITVEC));
} else
memcpy( (void*)LTG_SIGN(datum_l), (void*)union_l, sizeof(ABITVEC) );
}
size_l = size_alpha;
*left++ = j;
v->spl_nleft++;
} else {
if ( ! LTG_ISALLTRUE( datum_r ) ) {
if ( size_beta == ASIGLENBIT ) {
if ( size_beta != size_r )
MemSet( (void*)LTG_SIGN(datum_r),0xff, sizeof(ABITVEC));
} else
memcpy( (void*)LTG_SIGN(datum_r), (void*)union_r, sizeof(ABITVEC) );
}
size_r = size_beta;
*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 );
}
static bool
gist_te(ltree_gist *key, ltree* query) {
ltree_level *curq = LTREE_FIRST(query);
BITVECP sign = LTG_SIGN(key);
int qlen = query->numlevel;
unsigned int hv;
if ( LTG_ISALLTRUE(key) )
return true;
while( qlen>0 ) {
hv = ltree_crc32_sz(curq->name,curq->len);
if ( ! GETBIT( sign, AHASHVAL(hv) ) )
return false;
curq = LEVEL_NEXT(curq);
qlen--;
}
return true;
}
static bool
checkcondition_bit(void *checkval, ITEM* val ) {
return ( FLG_CANLOOKSIGN(val->flag) ) ? GETBIT( checkval, AHASHVAL( val->val ) ) : true;
}
static bool
gist_qtxt(ltree_gist *key, ltxtquery* query) {
if ( LTG_ISALLTRUE(key) )
return true;
return ltree_execute(
GETQUERY(query),
(void*)LTG_SIGN(key), false,
checkcondition_bit
);
}
static bool
gist_qe(ltree_gist *key, lquery* query) {
lquery_level *curq = LQUERY_FIRST(query);
BITVECP sign = LTG_SIGN(key);
int qlen = query->numlevel;
if ( LTG_ISALLTRUE(key) )
return true;
while( qlen>0 ) {
if ( curq->numvar && LQL_CANLOOKSIGN(curq) ) {
bool isexist=false;
int vlen = curq->numvar;
lquery_variant *curv = LQL_FIRST(curq);
while( vlen>0 ) {
if ( GETBIT( sign, AHASHVAL( curv->val ) ) ) {
isexist=true;
break;
}
curv = LVAR_NEXT(curv);
vlen--;
}
if ( !isexist )
return false;
}
curq = LQL_NEXT(curq);
qlen--;
}
return true;
}
Datum
_ltree_consistent(PG_FUNCTION_ARGS) {
GISTENTRY *entry = (GISTENTRY*)PG_GETARG_POINTER(0);
char *query = (char*)DatumGetPointer( PG_DETOAST_DATUM(PG_GETARG_DATUM(1)) );
ltree_gist *key = (ltree_gist*)DatumGetPointer( entry->key );
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
bool res = false;
#ifndef assert_enabled
#define assert_enabled 0
#endif
switch( strategy ) {
case 10:
case 11:
res = gist_te(key, (ltree*)query);
break;
case 12:
case 13:
res = gist_qe(key, (lquery*)query);
break;
case 14:
case 15:
res = gist_qtxt(key, (ltxtquery*)query);
break;
default:
elog(ERROR,"Unknown StrategyNumber: %d", strategy);
}
PG_RETURN_BOOL(res);
}