postgresql/contrib/tsearch2/query_gist.c
Neil Conway 8e5a10d46c This patch makes the error message strings throughout the backend
more compliant with the error message style guide. In particular,
errdetail should begin with a capital letter and end with a period,
whereas errmsg should not. I also fixed a few related issues in
passing, such as fixing the repeated misspelling of "lexeme" in
contrib/tsearch2 (per Tom's suggestion).
2006-03-01 06:30:32 +00:00

373 lines
7.5 KiB
C

#include "postgres.h"
#include "storage/bufpage.h"
#include "access/skey.h"
#include "access/gist.h"
#include "query.h"
typedef uint64 TPQTGist;
#define SIGLEN (sizeof(TPQTGist)*BITS_PER_BYTE)
#define GETENTRY(vec,pos) ((TPQTGist *) DatumGetPointer((vec)->vector[(pos)].key))
PG_FUNCTION_INFO_V1(tsq_mcontains);
Datum tsq_mcontains(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(tsq_mcontained);
Datum tsq_mcontained(PG_FUNCTION_ARGS);
static TPQTGist
makesign(QUERYTYPE * a)
{
int i;
ITEM *ptr = GETQUERY(a);
TPQTGist sign = 0;
for (i = 0; i < a->size; i++)
{
if (ptr->type == VAL)
sign |= ((TPQTGist)1) << (ptr->val % SIGLEN);
ptr++;
}
return sign;
}
Datum
tsq_mcontains(PG_FUNCTION_ARGS)
{
QUERYTYPE *query = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM(PG_GETARG_DATUM(0)));
QUERYTYPE *ex = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM(PG_GETARG_DATUM(1)));
TPQTGist sq,
se;
int i,
j;
ITEM *iq,
*ie;
if (query->size < ex->size)
{
PG_FREE_IF_COPY(query, 0);
PG_FREE_IF_COPY(ex, 1);
PG_RETURN_BOOL(false);
}
sq = makesign(query);
se = makesign(ex);
if ((sq & se) != se)
{
PG_FREE_IF_COPY(query, 0);
PG_FREE_IF_COPY(ex, 1);
PG_RETURN_BOOL(false);
}
ie = GETQUERY(ex);
for (i = 0; i < ex->size; i++)
{
iq = GETQUERY(query);
if (ie[i].type != VAL)
continue;
for (j = 0; j < query->size; j++)
if (iq[j].type == VAL && ie[i].val == iq[j].val)
{
j = query->size + 1;
break;
}
if (j == query->size)
{
PG_FREE_IF_COPY(query, 0);
PG_FREE_IF_COPY(ex, 1);
PG_RETURN_BOOL(false);
}
}
PG_FREE_IF_COPY(query, 0);
PG_FREE_IF_COPY(ex, 1);
PG_RETURN_BOOL(true);
}
Datum
tsq_mcontained(PG_FUNCTION_ARGS)
{
PG_RETURN_DATUM(
DirectFunctionCall2(
tsq_mcontains,
PG_GETARG_DATUM(1),
PG_GETARG_DATUM(0)
)
);
}
PG_FUNCTION_INFO_V1(gtsq_in);
Datum gtsq_in(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(gtsq_out);
Datum gtsq_out(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(gtsq_compress);
Datum gtsq_compress(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(gtsq_decompress);
Datum gtsq_decompress(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(gtsq_consistent);
Datum gtsq_consistent(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(gtsq_union);
Datum gtsq_union(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(gtsq_same);
Datum gtsq_same(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(gtsq_penalty);
Datum gtsq_penalty(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(gtsq_picksplit);
Datum gtsq_picksplit(PG_FUNCTION_ARGS);
Datum
gtsq_in(PG_FUNCTION_ARGS)
{
elog(ERROR, "not implemented");
PG_RETURN_DATUM(0);
}
Datum
gtsq_out(PG_FUNCTION_ARGS)
{
elog(ERROR, "not implemented");
PG_RETURN_DATUM(0);
}
Datum
gtsq_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = entry;
if (entry->leafkey)
{
TPQTGist *sign = (TPQTGist *) palloc(sizeof(TPQTGist));
retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
*sign = makesign((QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM(entry->key)));
gistentryinit(*retval, PointerGetDatum(sign),
entry->rel, entry->page,
entry->offset, sizeof(TPQTGist), FALSE);
}
PG_RETURN_POINTER(retval);
}
Datum
gtsq_decompress(PG_FUNCTION_ARGS)
{
PG_RETURN_DATUM(PG_GETARG_DATUM(0));
}
Datum
gtsq_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
TPQTGist *key = (TPQTGist *) DatumGetPointer(entry->key);
QUERYTYPE *query = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM(PG_GETARG_DATUM(1)));
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
TPQTGist sq = makesign(query);
if (GIST_LEAF(entry))
PG_RETURN_BOOL(((*key) & sq) == ((strategy == 1) ? sq : *key));
else
PG_RETURN_BOOL((*key) & sq);
}
Datum
gtsq_union(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
TPQTGist *sign = (TPQTGist *) palloc(sizeof(TPQTGist));
int i;
int *size = (int *) PG_GETARG_POINTER(1);
memset(sign, 0, sizeof(TPQTGist));
for (i = 0; i < entryvec->n; i++)
*sign |= *GETENTRY(entryvec, i);
*size = sizeof(TPQTGist);
PG_RETURN_POINTER(sign);
}
Datum
gtsq_same(PG_FUNCTION_ARGS)
{
TPQTGist *a = (TPQTGist *) PG_GETARG_POINTER(0);
TPQTGist *b = (TPQTGist *) PG_GETARG_POINTER(1);
PG_RETURN_POINTER(*a == *b);
}
static int
sizebitvec(TPQTGist sign)
{
int size = 0,
i;
for (i = 0; i < SIGLEN; i++)
size += 0x01 & (sign >> i);
return size;
}
static int
hemdist(TPQTGist a, TPQTGist b)
{
TPQTGist res = a ^ b;
return sizebitvec(res);
}
Datum
gtsq_penalty(PG_FUNCTION_ARGS)
{
TPQTGist *origval = (TPQTGist *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
TPQTGist *newval = (TPQTGist *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
float *penalty = (float *) PG_GETARG_POINTER(2);
*penalty = hemdist(*origval, *newval);
PG_RETURN_POINTER(penalty);
}
typedef struct
{
OffsetNumber pos;
int4 cost;
} SPLITCOST;
static int
comparecost(const void *a, const void *b)
{
if (((SPLITCOST *) a)->cost == ((SPLITCOST *) b)->cost)
return 0;
else
return (((SPLITCOST *) a)->cost > ((SPLITCOST *) b)->cost) ? 1 : -1;
}
#define WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
Datum
gtsq_picksplit(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
OffsetNumber maxoff = entryvec->n - 2;
OffsetNumber k,
j;
TPQTGist *datum_l,
*datum_r;
int4 size_alpha,
size_beta;
int4 size_waste,
waste = -1;
int4 nbytes;
OffsetNumber seed_1 = 0,
seed_2 = 0;
OffsetNumber *left,
*right;
SPLITCOST *costvector;
nbytes = (maxoff + 2) * sizeof(OffsetNumber);
left = v->spl_left = (OffsetNumber *) palloc(nbytes);
right = v->spl_right = (OffsetNumber *) palloc(nbytes);
v->spl_nleft = v->spl_nright = 0;
for (k = FirstOffsetNumber; k < maxoff; k = OffsetNumberNext(k))
for (j = OffsetNumberNext(k); j <= maxoff; j = OffsetNumberNext(j))
{
size_waste = hemdist(*GETENTRY(entryvec, j), *GETENTRY(entryvec, k));
if (size_waste > waste)
{
waste = size_waste;
seed_1 = k;
seed_2 = j;
}
}
if (seed_1 == 0 || seed_2 == 0)
{
seed_1 = 1;
seed_2 = 2;
}
datum_l = (TPQTGist *) palloc(sizeof(TPQTGist));
*datum_l = *GETENTRY(entryvec, seed_1);
datum_r = (TPQTGist *) palloc(sizeof(TPQTGist));
*datum_r = *GETENTRY(entryvec, seed_2);
maxoff = OffsetNumberNext(maxoff);
costvector = (SPLITCOST *) palloc(sizeof(SPLITCOST) * maxoff);
for (j = FirstOffsetNumber; j <= maxoff; j = OffsetNumberNext(j))
{
costvector[j - 1].pos = j;
size_alpha = hemdist(*GETENTRY(entryvec, seed_1), *GETENTRY(entryvec, j));
size_beta = hemdist(*GETENTRY(entryvec, seed_2), *GETENTRY(entryvec, j));
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;
if (j == seed_1)
{
*left++ = j;
v->spl_nleft++;
continue;
}
else if (j == seed_2)
{
*right++ = j;
v->spl_nright++;
continue;
}
size_alpha = hemdist(*datum_l, *GETENTRY(entryvec, j));
size_beta = hemdist(*datum_r, *GETENTRY(entryvec, j));
if (size_alpha < size_beta + WISH_F(v->spl_nleft, v->spl_nright, 0.05))
{
*datum_l |= *GETENTRY(entryvec, j);
*left++ = j;
v->spl_nleft++;
}
else
{
*datum_r |= *GETENTRY(entryvec, j);
*right++ = j;
v->spl_nright++;
}
}
*right = *left = FirstOffsetNumber;
v->spl_ldatum = PointerGetDatum(datum_l);
v->spl_rdatum = PointerGetDatum(datum_r);
PG_RETURN_POINTER(v);
}