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smlar_gist.c
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smlar_gist.c
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#include "smlar.h"
#include "fmgr.h"
#include "access/gist.h"
#include "access/skey.h"
#if PG_VERSION_NUM < 130000
#include "access/tuptoaster.h"
#else
#include "access/heaptoast.h"
#endif
#include "utils/memutils.h"
typedef struct SmlSign {
int32 vl_len_; /* varlena header (do not touch directly!) */
int32 flag:8,
size:24;
int32 maxrepeat;
char data[1];
} SmlSign;
#define SMLSIGNHDRSZ (offsetof(SmlSign, data))
#define BITBYTE 8
#define SIGLENINT 61
#define SIGLEN ( sizeof(int)*SIGLENINT )
#define SIGLENBIT (SIGLEN*BITBYTE - 1) /* see makesign */
typedef char BITVEC[SIGLEN];
typedef char *BITVECP;
#define LOOPBYTE \
for(i=0;i<SIGLEN;i++)
#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))
#define ARRKEY 0x01
#define SIGNKEY 0x02
#define ALLISTRUE 0x04
#define ISARRKEY(x) ( ((SmlSign*)x)->flag & ARRKEY )
#define ISSIGNKEY(x) ( ((SmlSign*)x)->flag & SIGNKEY )
#define ISALLTRUE(x) ( ((SmlSign*)x)->flag & ALLISTRUE )
#define CALCGTSIZE(flag, len) ( SMLSIGNHDRSZ + ( ( (flag) & ARRKEY ) ? ((len)*sizeof(uint32)) : (((flag) & ALLISTRUE) ? 0 : SIGLEN) ) )
#define GETSIGN(x) ( (BITVECP)( (char*)x+SMLSIGNHDRSZ ) )
#define GETARR(x) ( (uint32*)( (char*)x+SMLSIGNHDRSZ ) )
#define GETENTRY(vec,pos) ((SmlSign *) DatumGetPointer((vec)->vector[(pos)].key))
/*
* Fake IO
*/
PG_FUNCTION_INFO_V1(gsmlsign_in);
Datum gsmlsign_in(PG_FUNCTION_ARGS);
Datum
gsmlsign_in(PG_FUNCTION_ARGS)
{
elog(ERROR, "not implemented");
PG_RETURN_DATUM(0);
}
PG_FUNCTION_INFO_V1(gsmlsign_out);
Datum gsmlsign_out(PG_FUNCTION_ARGS);
Datum
gsmlsign_out(PG_FUNCTION_ARGS)
{
elog(ERROR, "not implemented");
PG_RETURN_DATUM(0);
}
/*
* Compress/decompress
*/
/* 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,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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,
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, 4, 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
};
static int
compareint(const void *va, const void *vb)
{
uint32 a = *((uint32 *) va);
uint32 b = *((uint32 *) vb);
if (a == b)
return 0;
return (a > b) ? 1 : -1;
}
/*
* Removes duplicates from an array of int32. 'l' is
* size of the input array. Returns the new size of the array.
*/
static int
uniqueint(uint32 *a, int32 l, int32 *max)
{
uint32 *ptr,
*res;
int32 cnt = 0;
*max = 1;
if (l <= 1)
return l;
ptr = res = a;
qsort((void *) a, l, sizeof(uint32), compareint);
while (ptr - a < l)
if (*ptr != *res)
{
cnt = 1;
*(++res) = *ptr++;
}
else
{
cnt++;
if ( cnt > *max )
*max = cnt;
ptr++;
}
if ( cnt > *max )
*max = cnt;
return res + 1 - a;
}
SmlSign*
Array2HashedArray(ProcTypeInfo info, ArrayType *a)
{
SimpleArray *s = Array2SimpleArray(info, a);
SmlSign *sign;
int32 len, i;
uint32 *ptr;
len = CALCGTSIZE( ARRKEY, s->nelems );
getFmgrInfoHash(s->info);
if (s->info->tupDesc)
elog(ERROR, "GiST doesn't support composite (weighted) type");
sign = palloc( len );
sign->flag = ARRKEY;
sign->size = s->nelems;
ptr = GETARR(sign);
for(i=0;i<s->nelems;i++)
ptr[i] = DatumGetUInt32(FunctionCall1Coll(&s->info->hashFunc,
DEFAULT_COLLATION_OID,
s->elems[i]));
/*
* there is a collision of hash-function; len is always equal or less than
* s->nelems
*/
sign->size = uniqueint( GETARR(sign), sign->size, &sign->maxrepeat );
len = CALCGTSIZE( ARRKEY, sign->size );
SET_VARSIZE(sign, len);
return sign;
}
static int
HashedElemCmp(const void *va, const void *vb)
{
uint32 a = ((HashedElem *) va)->hash;
uint32 b = ((HashedElem *) vb)->hash;
if (a == b)
{
double ma = ((HashedElem *) va)->idfMin;
double mb = ((HashedElem *) va)->idfMin;
if (ma == mb)
return 0;
return ( ma > mb ) ? 1 : -1;
}
return (a > b) ? 1 : -1;
}
static int
uniqueHashedElem(HashedElem *a, int32 l)
{
HashedElem *ptr,
*res;
if (l <= 1)
return l;
ptr = res = a;
qsort(a, l, sizeof(HashedElem), HashedElemCmp);
while (ptr - a < l)
if (ptr->hash != res->hash)
*(++res) = *ptr++;
else
{
res->idfMax = ptr->idfMax;
ptr++;
}
return res + 1 - a;
}
static StatCache*
getHashedCache(void *cache)
{
StatCache *stat = getStat(cache, SIGLENBIT);
if ( stat->nhelems < 0 )
{
int i;
/*
* Init
*/
if (stat->info->tupDesc)
elog(ERROR, "GiST doesn't support composite (weighted) type");
getFmgrInfoHash(stat->info);
for(i=0;i<stat->nelems;i++)
{
uint32 hash;
int index;
hash = DatumGetUInt32(FunctionCall1Coll(&stat->info->hashFunc,
DEFAULT_COLLATION_OID,
stat->elems[i].datum));
index = HASHVAL(hash);
stat->helems[i].hash = hash;
stat->helems[i].idfMin = stat->helems[i].idfMax = stat->elems[i].idf;
if ( stat->selems[index].idfMin == 0.0 )
stat->selems[index].idfMin = stat->selems[index].idfMax = stat->elems[i].idf;
else if ( stat->selems[index].idfMin > stat->elems[i].idf )
stat->selems[index].idfMin = stat->elems[i].idf;
else if ( stat->selems[index].idfMax < stat->elems[i].idf )
stat->selems[index].idfMax = stat->elems[i].idf;
}
stat->nhelems = uniqueHashedElem( stat->helems, stat->nelems);
}
return stat;
}
static HashedElem*
getHashedElemIdf(StatCache *stat, uint32 hash, HashedElem *StopLow)
{
HashedElem *StopMiddle,
*StopHigh = stat->helems + stat->nhelems;
if ( !StopLow )
StopLow = stat->helems;
while (StopLow < StopHigh) {
StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
if ( StopMiddle->hash == hash )
return StopMiddle;
else if ( StopMiddle->hash < hash )
StopLow = StopMiddle + 1;
else
StopHigh = StopMiddle;
}
return NULL;
}
static void
fillHashVal(void *cache, SimpleArray *a)
{
int i;
if (a->hash)
return;
allocateHash(cache, a);
if (a->info->tupDesc)
elog(ERROR, "GiST doesn't support composite (weighted) type");
getFmgrInfoHash(a->info);
for(i=0;i<a->nelems;i++)
a->hash[i] = DatumGetUInt32(FunctionCall1Coll(&a->info->hashFunc,
DEFAULT_COLLATION_OID,
a->elems[i]));
}
static bool
hasHashedElem(SmlSign *a, uint32 h)
{
uint32 *StopLow = GETARR(a),
*StopHigh = GETARR(a) + a->size,
*StopMiddle;
while (StopLow < StopHigh) {
StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
if ( *StopMiddle == h )
return true;
else if ( *StopMiddle < h )
StopLow = StopMiddle + 1;
else
StopHigh = StopMiddle;
}
return false;
}
static void
makesign(BITVECP sign, SmlSign *a)
{
int32 i;
uint32 *ptr = GETARR(a);
MemSet((void *) sign, 0, sizeof(BITVEC));
SETBIT(sign, SIGLENBIT); /* set last unused bit */
for (i = 0; i < a->size; i++)
HASH(sign, ptr[i]);
}
static int32
sizebitvec(BITVECP sign)
{
int32 size = 0,
i;
LOOPBYTE
size += number_of_ones[(unsigned char) sign[i]];
return size;
}
PG_FUNCTION_INFO_V1(gsmlsign_compress);
Datum gsmlsign_compress(PG_FUNCTION_ARGS);
Datum
gsmlsign_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = entry;
if (entry->leafkey) /* new key */
{
SmlSign *sign;
ArrayType *a = DatumGetArrayTypeP(entry->key);
sign = Array2HashedArray(NULL, a);
if ( VARSIZE(sign) > TOAST_INDEX_TARGET )
{ /* make signature due to its big size */
SmlSign *tmpsign;
int len;
len = CALCGTSIZE( SIGNKEY, sign->size );
tmpsign = palloc( len );
tmpsign->flag = SIGNKEY;
SET_VARSIZE(tmpsign, len);
makesign(GETSIGN(tmpsign), sign);
tmpsign->size = sizebitvec(GETSIGN(tmpsign));
tmpsign->maxrepeat = sign->maxrepeat;
sign = tmpsign;
}
retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(sign),
entry->rel, entry->page,
entry->offset, false);
}
else if ( ISSIGNKEY(DatumGetPointer(entry->key)) &&
!ISALLTRUE(DatumGetPointer(entry->key)) )
{
SmlSign *sign = (SmlSign*)DatumGetPointer(entry->key);
Assert( sign->size == sizebitvec(GETSIGN(sign)) );
if ( sign->size == SIGLENBIT )
{
int32 len = CALCGTSIZE(SIGNKEY | ALLISTRUE, 0);
int32 maxrepeat = sign->maxrepeat;
sign = (SmlSign *) palloc(len);
SET_VARSIZE(sign, len);
sign->flag = SIGNKEY | ALLISTRUE;
sign->size = SIGLENBIT;
sign->maxrepeat = maxrepeat;
retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(sign),
entry->rel, entry->page,
entry->offset, false);
}
}
PG_RETURN_POINTER(retval);
}
PG_FUNCTION_INFO_V1(gsmlsign_decompress);
Datum gsmlsign_decompress(PG_FUNCTION_ARGS);
Datum
gsmlsign_decompress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
SmlSign *key = (SmlSign*)DatumGetPointer(PG_DETOAST_DATUM(entry->key));
if (key != (SmlSign *) DatumGetPointer(entry->key))
{
GISTENTRY *retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(key),
entry->rel, entry->page,
entry->offset, false);
PG_RETURN_POINTER(retval);
}
PG_RETURN_POINTER(entry);
}
/*
* Union method
*/
static bool
unionkey(BITVECP sbase, SmlSign *add)
{
int32 i;
if (ISSIGNKEY(add))
{
BITVECP sadd = GETSIGN(add);
if (ISALLTRUE(add))
return true;
LOOPBYTE
sbase[i] |= sadd[i];
}
else
{
uint32 *ptr = GETARR(add);
for (i = 0; i < add->size; i++)
HASH(sbase, ptr[i]);
}
return false;
}
PG_FUNCTION_INFO_V1(gsmlsign_union);
Datum gsmlsign_union(PG_FUNCTION_ARGS);
Datum
gsmlsign_union(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
int *size = (int *) PG_GETARG_POINTER(1);
BITVEC base;
int32 i,
len,
maxrepeat = 1;
int32 flag = 0;
SmlSign *result;
MemSet((void *) base, 0, sizeof(BITVEC));
for (i = 0; i < entryvec->n; i++)
{
if (GETENTRY(entryvec, i)->maxrepeat > maxrepeat)
maxrepeat = GETENTRY(entryvec, i)->maxrepeat;
if (unionkey(base, GETENTRY(entryvec, i)))
{
flag = ALLISTRUE;
break;
}
}
flag |= SIGNKEY;
len = CALCGTSIZE(flag, 0);
result = (SmlSign *) palloc(len);
*size = len;
SET_VARSIZE(result, len);
result->flag = flag;
result->maxrepeat = maxrepeat;
if (!ISALLTRUE(result))
{
memcpy((void *) GETSIGN(result), (void *) base, sizeof(BITVEC));
result->size = sizebitvec(GETSIGN(result));
}
else
result->size = SIGLENBIT;
PG_RETURN_POINTER(result);
}
/*
* Same method
*/
PG_FUNCTION_INFO_V1(gsmlsign_same);
Datum gsmlsign_same(PG_FUNCTION_ARGS);
Datum
gsmlsign_same(PG_FUNCTION_ARGS)
{
SmlSign *a = (SmlSign*)PG_GETARG_POINTER(0);
SmlSign *b = (SmlSign*)PG_GETARG_POINTER(1);
bool *result = (bool *) PG_GETARG_POINTER(2);
if (a->size != b->size)
{
*result = false;
}
else if (ISSIGNKEY(a))
{ /* then b also ISSIGNKEY */
if ( ISALLTRUE(a) )
{
/* in this case b is all true too - other cases is catched
upper */
*result = true;
}
else
{
int32 i;
BITVECP sa = GETSIGN(a),
sb = GETSIGN(b);
*result = true;
if ( !ISALLTRUE(a) )
{
LOOPBYTE
{
if (sa[i] != sb[i])
{
*result = false;
break;
}
}
}
}
}
else
{
uint32 *ptra = GETARR(a),
*ptrb = GETARR(b);
int32 i;
*result = true;
for (i = 0; i < a->size; i++)
{
if ( ptra[i] != ptrb[i])
{
*result = false;
break;
}
}
}
PG_RETURN_POINTER(result);
}
/*
* Penalty method
*/
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(SmlSign *a, SmlSign *b)
{
if (ISALLTRUE(a))
{
if (ISALLTRUE(b))
return 0;
else
return SIGLENBIT - b->size;
}
else if (ISALLTRUE(b))
return SIGLENBIT - b->size;
return hemdistsign(GETSIGN(a), GETSIGN(b));
}
PG_FUNCTION_INFO_V1(gsmlsign_penalty);
Datum gsmlsign_penalty(PG_FUNCTION_ARGS);
Datum
gsmlsign_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);
SmlSign *origval = (SmlSign *) DatumGetPointer(origentry->key);
SmlSign *newval = (SmlSign *) DatumGetPointer(newentry->key);
BITVECP orig = GETSIGN(origval);
*penalty = 0.0;
if (ISARRKEY(newval))
{
BITVEC sign;
makesign(sign, newval);
if (ISALLTRUE(origval))
*penalty = ((float) (SIGLENBIT - sizebitvec(sign))) / (float) (SIGLENBIT + 1);
else
*penalty = hemdistsign(sign, orig);
}
else
*penalty = hemdist(origval, newval);
PG_RETURN_POINTER(penalty);
}
/*
* Picksplit method
*/
typedef struct
{
bool allistrue;
int32 size;
BITVEC sign;
} CACHESIGN;
static void
fillcache(CACHESIGN *item, SmlSign *key)
{
item->allistrue = false;
item->size = key->size;
if (ISARRKEY(key))
{
makesign(item->sign, key);
item->size = sizebitvec( item->sign );
}
else if (ISALLTRUE(key))
item->allistrue = true;
else
memcpy((void *) item->sign, (void *) GETSIGN(key), sizeof(BITVEC));
}
#define WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
typedef struct
{
OffsetNumber pos;
int32 cost;
} SPLITCOST;
static int
comparecost(const void *va, const void *vb)
{
SPLITCOST *a = (SPLITCOST *) va;
SPLITCOST *b = (SPLITCOST *) vb;
if (a->cost == b->cost)
return 0;
else
return (a->cost > b->cost) ? 1 : -1;
}
static int
hemdistcache(CACHESIGN *a, CACHESIGN *b)
{
if (a->allistrue)
{
if (b->allistrue)
return 0;
else
return SIGLENBIT - b->size;
}
else if (b->allistrue)
return SIGLENBIT - a->size;
return hemdistsign(a->sign, b->sign);
}
PG_FUNCTION_INFO_V1(gsmlsign_picksplit);
Datum gsmlsign_picksplit(PG_FUNCTION_ARGS);
Datum
gsmlsign_picksplit(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
OffsetNumber k,
j;
SmlSign *datum_l,
*datum_r;
BITVECP union_l,
union_r;
int32 size_alpha,
size_beta;
int32 size_waste,
waste = -1;
int32 nbytes;
OffsetNumber seed_1 = 0,
seed_2 = 0;
OffsetNumber *left,
*right;
OffsetNumber maxoff;
BITVECP ptr;
int i;
CACHESIGN *cache;
SPLITCOST *costvector;
maxoff = entryvec->n - 2;
nbytes = (maxoff + 2) * sizeof(OffsetNumber);
v->spl_left = (OffsetNumber *) palloc(nbytes);
v->spl_right = (OffsetNumber *) palloc(nbytes);
cache = (CACHESIGN *) palloc(sizeof(CACHESIGN) * (maxoff + 2));
fillcache(&cache[FirstOffsetNumber], GETENTRY(entryvec, FirstOffsetNumber));
for (k = FirstOffsetNumber; k < maxoff; k = OffsetNumberNext(k))
{
for (j = OffsetNumberNext(k); j <= maxoff; j = OffsetNumberNext(j))
{
if (k == FirstOffsetNumber)
fillcache(&cache[j], GETENTRY(entryvec, j));
size_waste = hemdistcache(&(cache[j]), &(cache[k]));
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 (cache[seed_1].allistrue)
{
datum_l = (SmlSign *) palloc(CALCGTSIZE(SIGNKEY | ALLISTRUE, 0));
SET_VARSIZE(datum_l, CALCGTSIZE(SIGNKEY | ALLISTRUE, 0));
datum_l->flag = SIGNKEY | ALLISTRUE;
datum_l->size = SIGLENBIT;
}
else
{
datum_l = (SmlSign *) palloc(CALCGTSIZE(SIGNKEY, 0));
SET_VARSIZE(datum_l, CALCGTSIZE(SIGNKEY, 0));
datum_l->flag = SIGNKEY;
memcpy((void *) GETSIGN(datum_l), (void *) cache[seed_1].sign, sizeof(BITVEC));
datum_l->size = cache[seed_1].size;
}
if (cache[seed_2].allistrue)
{
datum_r = (SmlSign *) palloc(CALCGTSIZE(SIGNKEY | ALLISTRUE, 0));
SET_VARSIZE(datum_r, CALCGTSIZE(SIGNKEY | ALLISTRUE, 0));
datum_r->flag = SIGNKEY | ALLISTRUE;
datum_r->size = SIGLENBIT;
}
else
{
datum_r = (SmlSign *) palloc(CALCGTSIZE(SIGNKEY, 0));
SET_VARSIZE(datum_r, CALCGTSIZE(SIGNKEY, 0));
datum_r->flag = SIGNKEY;
memcpy((void *) GETSIGN(datum_r), (void *) cache[seed_2].sign, sizeof(BITVEC));
datum_r->size = cache[seed_2].size;
}
union_l = GETSIGN(datum_l);
union_r = GETSIGN(datum_r);
maxoff = OffsetNumberNext(maxoff);
fillcache(&cache[maxoff], GETENTRY(entryvec, maxoff));
/* sort before ... */
costvector = (SPLITCOST *) palloc(sizeof(SPLITCOST) * maxoff);
for (j = FirstOffsetNumber; j <= maxoff; j = OffsetNumberNext(j))
{
costvector[j - 1].pos = j;
size_alpha = hemdistcache(&(cache[seed_1]), &(cache[j]));
size_beta = hemdistcache(&(cache[seed_2]), &(cache[j]));
costvector[j - 1].cost = Abs(size_alpha - size_beta);
}
qsort((void *) costvector, maxoff, sizeof(SPLITCOST), comparecost);
datum_l->maxrepeat = datum_r->maxrepeat = 1;
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;
}
if (ISALLTRUE(datum_l) || cache[j].allistrue)
{
if (ISALLTRUE(datum_l) && cache[j].allistrue)
size_alpha = 0;
else
size_alpha = SIGLENBIT - (
(cache[j].allistrue) ? datum_l->size : cache[j].size
);
}
else
size_alpha = hemdistsign(cache[j].sign, GETSIGN(datum_l));
if (ISALLTRUE(datum_r) || cache[j].allistrue)
{
if (ISALLTRUE(datum_r) && cache[j].allistrue)
size_beta = 0;
else
size_beta = SIGLENBIT - (
(cache[j].allistrue) ? datum_r->size : cache[j].size
);
}
else
size_beta = hemdistsign(cache[j].sign, GETSIGN(datum_r));
if (size_alpha < size_beta + WISH_F(v->spl_nleft, v->spl_nright, 0.1))
{
if (ISALLTRUE(datum_l) || cache[j].allistrue)
{
if (!ISALLTRUE(datum_l))
MemSet((void *) GETSIGN(datum_l), 0xff, sizeof(BITVEC));
datum_l->size = SIGLENBIT;
}
else
{
ptr = cache[j].sign;
LOOPBYTE
union_l[i] |= ptr[i];
datum_l->size = sizebitvec(union_l);
}
*left++ = j;
v->spl_nleft++;
}
else
{
if (ISALLTRUE(datum_r) || cache[j].allistrue)
{
if (!ISALLTRUE(datum_r))
MemSet((void *) GETSIGN(datum_r), 0xff, sizeof(BITVEC));
datum_r->size = SIGLENBIT;
}
else
{
ptr = cache[j].sign;
LOOPBYTE
union_r[i] |= ptr[i];
datum_r->size = sizebitvec(union_r);
}
*right++ = j;
v->spl_nright++;
}
}
*right = *left = FirstOffsetNumber;
v->spl_ldatum = PointerGetDatum(datum_l);
v->spl_rdatum = PointerGetDatum(datum_r);
Assert( datum_l->size = sizebitvec(GETSIGN(datum_l)) );
Assert( datum_r->size = sizebitvec(GETSIGN(datum_r)) );
PG_RETURN_POINTER(v);
}
static double
getIdfMaxLimit(SmlSign *key)
{
switch( getTFMethod() )
{
case TF_CONST:
return 1.0;
break;
case TF_N:
return (double)(key->maxrepeat);
break;
case TF_LOG:
return 1.0 + log( (double)(key->maxrepeat) );
break;
default:
elog(ERROR,"Unknown TF method: %d", getTFMethod());
}
return 0.0;
}
/*
* Consistent function
*/
PG_FUNCTION_INFO_V1(gsmlsign_consistent);
Datum gsmlsign_consistent(PG_FUNCTION_ARGS);
Datum
gsmlsign_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
bool *recheck = (bool *) PG_GETARG_POINTER(4);
ArrayType *a;
SmlSign *key = (SmlSign*)DatumGetPointer(entry->key);
int res = false;
SmlSign *query;
SimpleArray *s;
int32 i;
fcinfo->flinfo->fn_extra = SearchArrayCache(
fcinfo->flinfo->fn_extra,
fcinfo->flinfo->fn_mcxt,
PG_GETARG_DATUM(1), &a, &s, &query);
*recheck = true;
if ( ARRISVOID(a) )
PG_RETURN_BOOL(res);
if ( strategy == SmlarOverlapStrategy )
{
if (ISALLTRUE(key))
{
res = true;
}
else if (ISARRKEY(key))
{
uint32 *kptr = GETARR(key),
*qptr = GETARR(query);
while( kptr - GETARR(key) < key->size && qptr - GETARR(query) < query->size )
{
if ( *kptr < *qptr )
kptr++;
else if ( *kptr > *qptr )
qptr++;
else
{
res = true;
break;
}
}
*recheck = false;
}
else
{
BITVECP sign = GETSIGN(key);
fillHashVal(fcinfo->flinfo->fn_extra, s);
for(i=0; i<s->nelems; i++)
{
if ( GETBIT(sign, HASHVAL(s->hash[i])) )