postgresql/contrib/ltree/_ltree_gist.c

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/*
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* contrib/ltree/_ltree_gist.c
*
*
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* GiST support for ltree[]
* Teodor Sigaev <teodor@stack.net>
*/
#include "postgres.h"
#include "access/gist.h"
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#include "access/skey.h"
#include "crc32.h"
#include "ltree.h"
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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((vec)->vector[(pos)].key))
#define NEXTVAL(x) ( (ltree*)( (char*)(x) + INTALIGN( VARSIZE(x) ) ) )
/* 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
};
#define WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
static void
hashing(BITVECP sign, ltree *t)
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{
int tlen = t->numlevel;
ltree_level *cur = LTREE_FIRST(t);
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int hash;
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while (tlen > 0)
{
hash = ltree_crc32_sz(cur->name, cur->len);
AHASH(sign, hash);
cur = LEVEL_NEXT(cur);
tlen--;
}
}
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Datum
_ltree_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = entry;
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if (entry->leafkey)
{ /* ltree */
ltree_gist *key;
ArrayType *val = DatumGetArrayTypeP(entry->key);
int32 len = LTG_HDRSIZE + ASIGLEN;
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int num = ArrayGetNItems(ARR_NDIM(val), ARR_DIMS(val));
ltree *item = (ltree *) ARR_DATA_PTR(val);
if (ARR_NDIM(val) > 1)
ereport(ERROR,
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(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("array must be one-dimensional")));
if (array_contains_nulls(val))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("array must not contain nulls")));
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key = (ltree_gist *) palloc(len);
SET_VARSIZE(key, len);
key->flag = 0;
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MemSet(LTG_SIGN(key), 0, ASIGLEN);
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while (num > 0)
{
hashing(LTG_SIGN(key), item);
num--;
item = NEXTVAL(item);
}
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retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(key),
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entry->rel, entry->page,
entry->offset, FALSE);
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}
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else if (!LTG_ISALLTRUE(entry->key))
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{
int32 i,
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len;
ltree_gist *key;
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BITVECP sign = LTG_SIGN(DatumGetPointer(entry->key));
ALOOPBYTE
{
if ((sign[i] & 0xff) != 0xff)
PG_RETURN_POINTER(retval);
}
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len = LTG_HDRSIZE;
key = (ltree_gist *) palloc(len);
SET_VARSIZE(key, len);
key->flag = LTG_ALLTRUE;
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retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(key),
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entry->rel, entry->page,
entry->offset, FALSE);
}
PG_RETURN_POINTER(retval);
}
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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);
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if (LTG_ISALLTRUE(a) && LTG_ISALLTRUE(b))
*result = true;
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else if (LTG_ISALLTRUE(a))
*result = false;
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else if (LTG_ISALLTRUE(b))
*result = false;
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else
{
int32 i;
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BITVECP sa = LTG_SIGN(a),
sb = LTG_SIGN(b);
*result = true;
ALOOPBYTE
{
if (sa[i] != sb[i])
{
*result = false;
break;
}
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}
}
PG_RETURN_POINTER(result);
}
static int32
unionkey(BITVECP sbase, ltree_gist *add)
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{
int32 i;
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BITVECP sadd = LTG_SIGN(add);
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if (LTG_ISALLTRUE(add))
return 1;
ALOOPBYTE
sbase[i] |= sadd[i];
return 0;
}
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Datum
_ltree_union(PG_FUNCTION_ARGS)
{
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GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
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int *size = (int *) PG_GETARG_POINTER(1);
ABITVEC base;
int32 i,
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len;
int32 flag = 0;
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ltree_gist *result;
MemSet((void *) base, 0, sizeof(ABITVEC));
for (i = 0; i < entryvec->n; i++)
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{
if (unionkey(base, GETENTRY(entryvec, i)))
{
flag = LTG_ALLTRUE;
break;
}
}
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len = LTG_HDRSIZE + ((flag & LTG_ALLTRUE) ? 0 : ASIGLEN);
result = (ltree_gist *) palloc(len);
SET_VARSIZE(result, len);
result->flag = flag;
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if (!LTG_ISALLTRUE(result))
memcpy((void *) LTG_SIGN(result), (void *) base, sizeof(ABITVEC));
*size = len;
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PG_RETURN_POINTER(result);
}
static int32
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sizebitvec(BITVECP sign)
{
int32 size = 0,
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i;
ALOOPBYTE
size += number_of_ones[(unsigned char) sign[i]];
return size;
}
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static int
hemdistsign(BITVECP a, BITVECP b)
{
int i,
diff,
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dist = 0;
ALOOPBYTE
{
diff = (unsigned char) (a[i] ^ b[i]);
dist += number_of_ones[diff];
}
return dist;
}
static int
hemdist(ltree_gist *a, ltree_gist *b)
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{
if (LTG_ISALLTRUE(a))
{
if (LTG_ISALLTRUE(b))
return 0;
else
return ASIGLENBIT - sizebitvec(LTG_SIGN(b));
}
else if (LTG_ISALLTRUE(b))
return ASIGLENBIT - sizebitvec(LTG_SIGN(a));
return hemdistsign(LTG_SIGN(a), LTG_SIGN(b));
}
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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);
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*penalty = hemdist(origval, newval);
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PG_RETURN_POINTER(penalty);
}
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typedef struct
{
OffsetNumber pos;
int32 cost;
} SPLITCOST;
static int
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comparecost(const void *a, const void *b)
{
return ((const SPLITCOST *) a)->cost - ((const SPLITCOST *) b)->cost;
}
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Datum
_ltree_picksplit(PG_FUNCTION_ARGS)
{
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GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
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GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
OffsetNumber k,
j;
ltree_gist *datum_l,
*datum_r;
BITVECP union_l,
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union_r;
int32 size_alpha,
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size_beta;
int32 size_waste,
waste = -1;
int32 nbytes;
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OffsetNumber seed_1 = 0,
seed_2 = 0;
OffsetNumber *left,
*right;
OffsetNumber maxoff;
BITVECP ptr;
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int i;
SPLITCOST *costvector;
ltree_gist *_k,
*_j;
maxoff = entryvec->n - 2;
nbytes = (maxoff + 2) * sizeof(OffsetNumber);
v->spl_left = (OffsetNumber *) palloc(nbytes);
v->spl_right = (OffsetNumber *) palloc(nbytes);
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for (k = FirstOffsetNumber; k < maxoff; k = OffsetNumberNext(k))
{
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_k = GETENTRY(entryvec, k);
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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;
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if (seed_1 == 0 || seed_2 == 0)
{
seed_1 = 1;
seed_2 = 2;
}
/* form initial .. */
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if (LTG_ISALLTRUE(GETENTRY(entryvec, seed_1)))
{
datum_l = (ltree_gist *) palloc(LTG_HDRSIZE);
SET_VARSIZE(datum_l, LTG_HDRSIZE);
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datum_l->flag = LTG_ALLTRUE;
}
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else
{
datum_l = (ltree_gist *) palloc(LTG_HDRSIZE + ASIGLEN);
SET_VARSIZE(datum_l, LTG_HDRSIZE + ASIGLEN);
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datum_l->flag = 0;
memcpy((void *) LTG_SIGN(datum_l), (void *) LTG_SIGN(GETENTRY(entryvec, seed_1)), sizeof(ABITVEC));
}
if (LTG_ISALLTRUE(GETENTRY(entryvec, seed_2)))
{
datum_r = (ltree_gist *) palloc(LTG_HDRSIZE);
SET_VARSIZE(datum_r, LTG_HDRSIZE);
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datum_r->flag = LTG_ALLTRUE;
}
else
{
datum_r = (ltree_gist *) palloc(LTG_HDRSIZE + ASIGLEN);
SET_VARSIZE(datum_r, LTG_HDRSIZE + ASIGLEN);
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datum_r->flag = 0;
memcpy((void *) LTG_SIGN(datum_r), (void *) LTG_SIGN(GETENTRY(entryvec, seed_2)), sizeof(ABITVEC));
}
maxoff = OffsetNumberNext(maxoff);
/* sort before ... */
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costvector = (SPLITCOST *) palloc(sizeof(SPLITCOST) * maxoff);
for (j = FirstOffsetNumber; j <= maxoff; j = OffsetNumberNext(j))
{
costvector[j - 1].pos = j;
_j = GETENTRY(entryvec, j);
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size_alpha = hemdist(datum_l, _j);
size_beta = hemdist(datum_r, _j);
costvector[j - 1].cost = Abs(size_alpha - size_beta);
}
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qsort((void *) costvector, maxoff, sizeof(SPLITCOST), comparecost);
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union_l = LTG_SIGN(datum_l);
union_r = LTG_SIGN(datum_r);
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for (k = 0; k < maxoff; k++)
{
j = costvector[k].pos;
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if (j == seed_1)
{
*left++ = j;
v->spl_nleft++;
continue;
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}
else if (j == seed_2)
{
*right++ = j;
v->spl_nright++;
continue;
}
_j = GETENTRY(entryvec, j);
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size_alpha = hemdist(datum_l, _j);
size_beta = hemdist(datum_r, _j);
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if (size_alpha < size_beta + WISH_F(v->spl_nleft, v->spl_nright, 0.00001))
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{
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if (LTG_ISALLTRUE(datum_l) || LTG_ISALLTRUE(_j))
{
if (!LTG_ISALLTRUE(datum_l))
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MemSet((void *) union_l, 0xff, sizeof(ABITVEC));
}
else
{
ptr = LTG_SIGN(_j);
ALOOPBYTE
union_l[i] |= ptr[i];
}
*left++ = j;
v->spl_nleft++;
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}
else
{
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if (LTG_ISALLTRUE(datum_r) || LTG_ISALLTRUE(_j))
{
if (!LTG_ISALLTRUE(datum_r))
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MemSet((void *) union_r, 0xff, sizeof(ABITVEC));
}
else
{
ptr = LTG_SIGN(_j);
ALOOPBYTE
union_r[i] |= ptr[i];
}
*right++ = j;
v->spl_nright++;
}
}
*right = *left = FirstOffsetNumber;
v->spl_ldatum = PointerGetDatum(datum_l);
v->spl_rdatum = PointerGetDatum(datum_r);
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PG_RETURN_POINTER(v);
}
static bool
gist_te(ltree_gist *key, ltree *query)
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{
ltree_level *curq = LTREE_FIRST(query);
BITVECP sign = LTG_SIGN(key);
int qlen = query->numlevel;
unsigned int hv;
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if (LTG_ISALLTRUE(key))
return true;
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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)
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{
return (FLG_CANLOOKSIGN(val->flag)) ? GETBIT(checkval, AHASHVAL(val->val)) : true;
}
static bool
gist_qtxt(ltree_gist *key, ltxtquery *query)
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{
if (LTG_ISALLTRUE(key))
return true;
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return ltree_execute(
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GETQUERY(query),
(void *) LTG_SIGN(key), false,
checkcondition_bit
);
}
static bool
gist_qe(ltree_gist *key, lquery *query)
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{
lquery_level *curq = LQUERY_FIRST(query);
BITVECP sign = LTG_SIGN(key);
int qlen = query->numlevel;
if (LTG_ISALLTRUE(key))
return true;
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while (qlen > 0)
{
if (curq->numvar && LQL_CANLOOKSIGN(curq))
{
bool isexist = false;
int vlen = curq->numvar;
lquery_variant *curv = LQL_FIRST(curq);
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while (vlen > 0)
{
if (GETBIT(sign, AHASHVAL(curv->val)))
{
isexist = true;
break;
}
curv = LVAR_NEXT(curv);
vlen--;
}
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if (!isexist)
return false;
}
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curq = LQL_NEXT(curq);
qlen--;
}
return true;
}
static bool
_arrq_cons(ltree_gist *key, ArrayType *_query)
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{
lquery *query = (lquery *) ARR_DATA_PTR(_query);
int num = ArrayGetNItems(ARR_NDIM(_query), ARR_DIMS(_query));
if (ARR_NDIM(_query) > 1)
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ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("array must be one-dimensional")));
if (array_contains_nulls(_query))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("array must not contain nulls")));
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while (num > 0)
{
if (gist_qe(key, query))
return true;
num--;
query = (lquery *) NEXTVAL(query);
}
return false;
}
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Datum
_ltree_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
char *query = (char *) DatumGetPointer(PG_DETOAST_DATUM(PG_GETARG_DATUM(1)));
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
/* Oid subtype = PG_GETARG_OID(3); */
bool *recheck = (bool *) PG_GETARG_POINTER(4);
ltree_gist *key = (ltree_gist *) DatumGetPointer(entry->key);
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bool res = false;
/* All cases served by this function are inexact */
*recheck = true;
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switch (strategy)
{
case 10:
case 11:
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res = gist_te(key, (ltree *) query);
break;
case 12:
case 13:
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res = gist_qe(key, (lquery *) query);
break;
case 14:
case 15:
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res = gist_qtxt(key, (ltxtquery *) query);
break;
case 16:
case 17:
res = _arrq_cons(key, (ArrayType *) query);
break;
default:
/* internal error */
elog(ERROR, "unrecognized StrategyNumber: %d", strategy);
}
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PG_FREE_IF_COPY(query, 1);
PG_RETURN_BOOL(res);
}