751 lines
16 KiB
C
751 lines
16 KiB
C
/* $PostgreSQL: pgsql/contrib/tsearch2/gistidx.c,v 1.14 2006/06/28 12:00:06 teodor Exp $ */
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#include "postgres.h"
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#include <float.h>
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#include "access/gist.h"
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#include "access/itup.h"
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#include "access/tuptoaster.h"
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#include "storage/bufpage.h"
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#include "utils/array.h"
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#include "utils/builtins.h"
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#include "tsvector.h"
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#include "query.h"
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#include "gistidx.h"
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#include "crc32.h"
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PG_FUNCTION_INFO_V1(gtsvector_in);
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Datum gtsvector_in(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(gtsvector_out);
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Datum gtsvector_out(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(gtsvector_compress);
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Datum gtsvector_compress(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(gtsvector_decompress);
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Datum gtsvector_decompress(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(gtsvector_consistent);
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Datum gtsvector_consistent(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(gtsvector_union);
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Datum gtsvector_union(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(gtsvector_same);
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Datum gtsvector_same(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(gtsvector_penalty);
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Datum gtsvector_penalty(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(gtsvector_picksplit);
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Datum gtsvector_picksplit(PG_FUNCTION_ARGS);
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#define GETENTRY(vec,pos) ((GISTTYPE *) DatumGetPointer((vec)->vector[(pos)].key))
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/* Number of one-bits in an unsigned byte */
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static const uint8 number_of_ones[256] = {
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0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
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};
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static int4 sizebitvec(BITVECP sign);
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Datum
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gtsvector_in(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("gtsvector_in not implemented")));
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PG_RETURN_DATUM(0);
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}
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#define SINGOUTSTR "%d true bits, %d false bits"
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#define ARROUTSTR "%d unique words"
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#define EXTRALEN ( 2*13 )
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static int outbuf_maxlen = 0;
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Datum
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gtsvector_out(PG_FUNCTION_ARGS)
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{
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GISTTYPE *key = (GISTTYPE *) DatumGetPointer(PG_DETOAST_DATUM(PG_GETARG_POINTER(0)));
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char *outbuf;
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if (outbuf_maxlen == 0)
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outbuf_maxlen = 2 * EXTRALEN + Max(strlen(SINGOUTSTR), strlen(ARROUTSTR)) + 1;
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outbuf = palloc(outbuf_maxlen);
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if (ISARRKEY(key))
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sprintf(outbuf, ARROUTSTR, (int) ARRNELEM(key));
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else
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{
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int cnttrue = (ISALLTRUE(key)) ? SIGLENBIT : sizebitvec(GETSIGN(key));
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sprintf(outbuf, SINGOUTSTR, cnttrue, (int) SIGLENBIT - cnttrue);
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}
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PG_FREE_IF_COPY(key, 0);
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PG_RETURN_POINTER(outbuf);
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}
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static int
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compareint(const void *a, const void *b)
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{
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if (*((int4 *) a) == *((int4 *) b))
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return 0;
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return (*((int4 *) a) > *((int4 *) b)) ? 1 : -1;
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}
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static int
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uniqueint(int4 *a, int4 l)
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{
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int4 *ptr,
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*res;
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if (l == 1)
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return l;
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ptr = res = a;
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qsort((void *) a, l, sizeof(int4), compareint);
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while (ptr - a < l)
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if (*ptr != *res)
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*(++res) = *ptr++;
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else
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ptr++;
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return res + 1 - a;
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}
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static void
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makesign(BITVECP sign, GISTTYPE * a)
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{
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int4 k,
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len = ARRNELEM(a);
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int4 *ptr = GETARR(a);
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MemSet((void *) sign, 0, sizeof(BITVEC));
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for (k = 0; k < len; k++)
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HASH(sign, ptr[k]);
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}
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Datum
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gtsvector_compress(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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GISTENTRY *retval = entry;
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if (entry->leafkey)
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{ /* tsvector */
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GISTTYPE *res;
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tsvector *val = (tsvector *) DatumGetPointer(PG_DETOAST_DATUM(entry->key));
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int4 len;
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int4 *arr;
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WordEntry *ptr = ARRPTR(val);
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char *words = STRPTR(val);
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len = CALCGTSIZE(ARRKEY, val->size);
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res = (GISTTYPE *) palloc(len);
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res->len = len;
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res->flag = ARRKEY;
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arr = GETARR(res);
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len = val->size;
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while (len--)
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{
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*arr = crc32_sz(&words[ptr->pos], ptr->len);
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arr++;
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ptr++;
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}
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len = uniqueint(GETARR(res), val->size);
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if (len != val->size)
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{
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/*
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* there is a collision of hash-function; len is always less than
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* val->size
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*/
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len = CALCGTSIZE(ARRKEY, len);
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res = (GISTTYPE *) repalloc((void *) res, len);
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res->len = len;
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}
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/* make signature, if array is too long */
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if (res->len > TOAST_INDEX_TARGET)
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{
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GISTTYPE *ressign;
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len = CALCGTSIZE(SIGNKEY, 0);
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ressign = (GISTTYPE *) palloc(len);
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ressign->len = len;
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ressign->flag = SIGNKEY;
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makesign(GETSIGN(ressign), res);
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res = ressign;
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}
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retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
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gistentryinit(*retval, PointerGetDatum(res),
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entry->rel, entry->page,
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entry->offset, FALSE);
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}
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else if (ISSIGNKEY(DatumGetPointer(entry->key)) &&
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!ISALLTRUE(DatumGetPointer(entry->key)))
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{
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int4 i,
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len;
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GISTTYPE *res;
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BITVECP sign = GETSIGN(DatumGetPointer(entry->key));
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LOOPBYTE(
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if ((sign[i] & 0xff) != 0xff)
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PG_RETURN_POINTER(retval);
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);
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len = CALCGTSIZE(SIGNKEY | ALLISTRUE, 0);
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res = (GISTTYPE *) palloc(len);
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res->len = len;
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res->flag = SIGNKEY | ALLISTRUE;
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retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
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gistentryinit(*retval, PointerGetDatum(res),
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entry->rel, entry->page,
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entry->offset, FALSE);
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}
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PG_RETURN_POINTER(retval);
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}
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Datum
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gtsvector_decompress(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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GISTTYPE *key = (GISTTYPE *) DatumGetPointer(PG_DETOAST_DATUM(entry->key));
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if (key != (GISTTYPE *) DatumGetPointer(entry->key))
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{
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GISTENTRY *retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
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gistentryinit(*retval, PointerGetDatum(key),
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entry->rel, entry->page,
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entry->offset, FALSE);
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PG_RETURN_POINTER(retval);
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}
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PG_RETURN_POINTER(entry);
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}
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typedef struct
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{
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int4 *arrb;
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int4 *arre;
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} CHKVAL;
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/*
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* is there value 'val' in array or not ?
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*/
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static bool
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checkcondition_arr(void *checkval, ITEM * val)
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{
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int4 *StopLow = ((CHKVAL *) checkval)->arrb;
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int4 *StopHigh = ((CHKVAL *) checkval)->arre;
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int4 *StopMiddle;
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/* Loop invariant: StopLow <= val < StopHigh */
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while (StopLow < StopHigh)
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{
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StopMiddle = StopLow + (StopHigh - StopLow) / 2;
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if (*StopMiddle == val->val)
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return (true);
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else if (*StopMiddle < val->val)
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StopLow = StopMiddle + 1;
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else
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StopHigh = StopMiddle;
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}
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return (false);
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}
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static bool
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checkcondition_bit(void *checkval, ITEM * val)
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{
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return GETBIT(checkval, HASHVAL(val->val));
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}
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Datum
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gtsvector_consistent(PG_FUNCTION_ARGS)
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{
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QUERYTYPE *query = (QUERYTYPE *) PG_GETARG_POINTER(1);
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GISTTYPE *key = (GISTTYPE *) DatumGetPointer(
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((GISTENTRY *) PG_GETARG_POINTER(0))->key
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);
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if (!query->size)
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PG_RETURN_BOOL(false);
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if (ISSIGNKEY(key))
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{
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if (ISALLTRUE(key))
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PG_RETURN_BOOL(true);
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PG_RETURN_BOOL(TS_execute(
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GETQUERY(query),
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(void *) GETSIGN(key), false,
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checkcondition_bit
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));
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}
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else
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{ /* only leaf pages */
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CHKVAL chkval;
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chkval.arrb = GETARR(key);
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chkval.arre = chkval.arrb + ARRNELEM(key);
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PG_RETURN_BOOL(TS_execute(
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GETQUERY(query),
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(void *) &chkval, true,
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checkcondition_arr
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));
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}
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}
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static int4
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unionkey(BITVECP sbase, GISTTYPE * add)
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{
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int4 i;
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if (ISSIGNKEY(add))
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{
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BITVECP sadd = GETSIGN(add);
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if (ISALLTRUE(add))
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return 1;
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LOOPBYTE(
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sbase[i] |= sadd[i];
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);
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}
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else
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{
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int4 *ptr = GETARR(add);
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for (i = 0; i < ARRNELEM(add); i++)
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HASH(sbase, ptr[i]);
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}
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return 0;
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}
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Datum
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gtsvector_union(PG_FUNCTION_ARGS)
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{
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GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
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int *size = (int *) PG_GETARG_POINTER(1);
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BITVEC base;
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int4 i,
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len;
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int4 flag = 0;
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GISTTYPE *result;
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MemSet((void *) base, 0, sizeof(BITVEC));
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for (i = 0; i < entryvec->n; i++)
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{
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if (unionkey(base, GETENTRY(entryvec, i)))
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{
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flag = ALLISTRUE;
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break;
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}
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}
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flag |= SIGNKEY;
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len = CALCGTSIZE(flag, 0);
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result = (GISTTYPE *) palloc(len);
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*size = result->len = len;
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result->flag = flag;
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if (!ISALLTRUE(result))
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memcpy((void *) GETSIGN(result), (void *) base, sizeof(BITVEC));
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PG_RETURN_POINTER(result);
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}
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Datum
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gtsvector_same(PG_FUNCTION_ARGS)
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{
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GISTTYPE *a = (GISTTYPE *) PG_GETARG_POINTER(0);
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GISTTYPE *b = (GISTTYPE *) PG_GETARG_POINTER(1);
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bool *result = (bool *) PG_GETARG_POINTER(2);
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if (ISSIGNKEY(a))
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{ /* then b also ISSIGNKEY */
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if (ISALLTRUE(a) && ISALLTRUE(b))
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*result = true;
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else if (ISALLTRUE(a))
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*result = false;
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else if (ISALLTRUE(b))
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*result = false;
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else
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{
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int4 i;
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BITVECP sa = GETSIGN(a),
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sb = GETSIGN(b);
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*result = true;
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LOOPBYTE(
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if (sa[i] != sb[i])
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{
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*result = false;
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break;
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}
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);
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}
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}
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else
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{ /* a and b ISARRKEY */
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int4 lena = ARRNELEM(a),
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lenb = ARRNELEM(b);
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if (lena != lenb)
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*result = false;
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else
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{
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int4 *ptra = GETARR(a),
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*ptrb = GETARR(b);
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int4 i;
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*result = true;
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for (i = 0; i < lena; i++)
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if (ptra[i] != ptrb[i])
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{
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*result = false;
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break;
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}
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}
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}
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PG_RETURN_POINTER(result);
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}
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static int4
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sizebitvec(BITVECP sign)
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{
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int4 size = 0,
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i;
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LOOPBYTE(
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size += number_of_ones[(unsigned char) sign[i]];
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);
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return size;
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}
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static int
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hemdistsign(BITVECP a, BITVECP b)
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{
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int i,
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diff,
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dist = 0;
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LOOPBYTE(
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diff = (unsigned char) (a[i] ^ b[i]);
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dist += number_of_ones[diff];
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);
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return dist;
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}
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static int
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hemdist(GISTTYPE * a, GISTTYPE * b)
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{
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if (ISALLTRUE(a))
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{
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if (ISALLTRUE(b))
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return 0;
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else
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return SIGLENBIT - sizebitvec(GETSIGN(b));
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}
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else if (ISALLTRUE(b))
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return SIGLENBIT - sizebitvec(GETSIGN(a));
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return hemdistsign(GETSIGN(a), GETSIGN(b));
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}
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Datum
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gtsvector_penalty(PG_FUNCTION_ARGS)
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{
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GISTENTRY *origentry = (GISTENTRY *) PG_GETARG_POINTER(0); /* always ISSIGNKEY */
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GISTENTRY *newentry = (GISTENTRY *) PG_GETARG_POINTER(1);
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float *penalty = (float *) PG_GETARG_POINTER(2);
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GISTTYPE *origval = (GISTTYPE *) DatumGetPointer(origentry->key);
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GISTTYPE *newval = (GISTTYPE *) DatumGetPointer(newentry->key);
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BITVECP orig = GETSIGN(origval);
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*penalty = 0.0;
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if (ISARRKEY(newval))
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{
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BITVEC sign;
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makesign(sign, newval);
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if (ISALLTRUE(origval))
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*penalty = ((float) (SIGLENBIT - sizebitvec(sign))) / (float) (SIGLENBIT + 1);
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else
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*penalty = hemdistsign(sign, orig);
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}
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else
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*penalty = hemdist(origval, newval);
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PG_RETURN_POINTER(penalty);
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}
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typedef struct
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{
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bool allistrue;
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BITVEC sign;
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} CACHESIGN;
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static void
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fillcache(CACHESIGN * item, GISTTYPE * key)
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{
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item->allistrue = false;
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if (ISARRKEY(key))
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makesign(item->sign, key);
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else if (ISALLTRUE(key))
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item->allistrue = true;
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else
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memcpy((void *) item->sign, (void *) GETSIGN(key), sizeof(BITVEC));
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}
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#define WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
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typedef struct
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{
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OffsetNumber pos;
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int4 cost;
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} SPLITCOST;
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static int
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comparecost(const void *a, const void *b)
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{
|
|
if (((SPLITCOST *) a)->cost == ((SPLITCOST *) b)->cost)
|
|
return 0;
|
|
else
|
|
return (((SPLITCOST *) a)->cost > ((SPLITCOST *) b)->cost) ? 1 : -1;
|
|
}
|
|
|
|
|
|
static int
|
|
hemdistcache(CACHESIGN * a, CACHESIGN * b)
|
|
{
|
|
if (a->allistrue)
|
|
{
|
|
if (b->allistrue)
|
|
return 0;
|
|
else
|
|
return SIGLENBIT - sizebitvec(b->sign);
|
|
}
|
|
else if (b->allistrue)
|
|
return SIGLENBIT - sizebitvec(a->sign);
|
|
|
|
return hemdistsign(a->sign, b->sign);
|
|
}
|
|
|
|
Datum
|
|
gtsvector_picksplit(PG_FUNCTION_ARGS)
|
|
{
|
|
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
|
|
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;
|
|
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 = (GISTTYPE *) palloc(CALCGTSIZE(SIGNKEY | ALLISTRUE, 0));
|
|
datum_l->len = CALCGTSIZE(SIGNKEY | ALLISTRUE, 0);
|
|
datum_l->flag = SIGNKEY | ALLISTRUE;
|
|
}
|
|
else
|
|
{
|
|
datum_l = (GISTTYPE *) palloc(CALCGTSIZE(SIGNKEY, 0));
|
|
datum_l->len = CALCGTSIZE(SIGNKEY, 0);
|
|
datum_l->flag = SIGNKEY;
|
|
memcpy((void *) GETSIGN(datum_l), (void *) cache[seed_1].sign, sizeof(BITVEC));
|
|
}
|
|
if (cache[seed_2].allistrue)
|
|
{
|
|
datum_r = (GISTTYPE *) palloc(CALCGTSIZE(SIGNKEY | ALLISTRUE, 0));
|
|
datum_r->len = CALCGTSIZE(SIGNKEY | ALLISTRUE, 0);
|
|
datum_r->flag = SIGNKEY | ALLISTRUE;
|
|
}
|
|
else
|
|
{
|
|
datum_r = (GISTTYPE *) palloc(CALCGTSIZE(SIGNKEY, 0));
|
|
datum_r->len = CALCGTSIZE(SIGNKEY, 0);
|
|
datum_r->flag = SIGNKEY;
|
|
memcpy((void *) GETSIGN(datum_r), (void *) cache[seed_2].sign, sizeof(BITVEC));
|
|
}
|
|
|
|
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);
|
|
|
|
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 - sizebitvec(
|
|
(cache[j].allistrue) ? GETSIGN(datum_l) : GETSIGN(cache[j].sign)
|
|
);
|
|
}
|
|
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 - sizebitvec(
|
|
(cache[j].allistrue) ? GETSIGN(datum_r) : GETSIGN(cache[j].sign)
|
|
);
|
|
}
|
|
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));
|
|
}
|
|
else
|
|
{
|
|
ptr = cache[j].sign;
|
|
LOOPBYTE(
|
|
union_l[i] |= ptr[i];
|
|
);
|
|
}
|
|
*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));
|
|
}
|
|
else
|
|
{
|
|
ptr = cache[j].sign;
|
|
LOOPBYTE(
|
|
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);
|
|
|
|
PG_RETURN_POINTER(v);
|
|
}
|