mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-15 08:20:16 +08:00
3b42bdb471
Commit 6b80394781 introduced integer comparison functions designed
to be as efficient as possible while avoiding overflow. This
commit makes use of these functions in many of the in-tree qsort()
comparators to help ensure transitivity. Many of these comparator
functions should also see a small performance boost.
Author: Mats Kindahl
Reviewed-by: Andres Freund, Fabrízio de Royes Mello
Discussion: https://postgr.es/m/CA%2B14426g2Wa9QuUpmakwPxXFWG_1FaY0AsApkvcTBy-YfS6uaw%40mail.gmail.com
599 lines
12 KiB
C
599 lines
12 KiB
C
/*
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* contrib/intarray/_intbig_gist.c
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*/
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#include "postgres.h"
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#include <math.h>
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#include "_int.h"
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#include "access/gist.h"
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#include "access/reloptions.h"
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#include "access/stratnum.h"
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#include "common/int.h"
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#include "port/pg_bitutils.h"
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#define GETENTRY(vec,pos) ((GISTTYPE *) DatumGetPointer((vec)->vector[(pos)].key))
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/*
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** _intbig methods
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*/
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PG_FUNCTION_INFO_V1(g_intbig_consistent);
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PG_FUNCTION_INFO_V1(g_intbig_compress);
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PG_FUNCTION_INFO_V1(g_intbig_decompress);
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PG_FUNCTION_INFO_V1(g_intbig_penalty);
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PG_FUNCTION_INFO_V1(g_intbig_picksplit);
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PG_FUNCTION_INFO_V1(g_intbig_union);
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PG_FUNCTION_INFO_V1(g_intbig_same);
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PG_FUNCTION_INFO_V1(g_intbig_options);
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PG_FUNCTION_INFO_V1(_intbig_in);
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PG_FUNCTION_INFO_V1(_intbig_out);
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Datum
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_intbig_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("cannot accept a value of type %s", "intbig_gkey")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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Datum
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_intbig_out(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("cannot display a value of type %s", "intbig_gkey")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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static GISTTYPE *
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_intbig_alloc(bool allistrue, int siglen, BITVECP sign)
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{
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int flag = allistrue ? ALLISTRUE : 0;
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int size = CALCGTSIZE(flag, siglen);
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GISTTYPE *res = (GISTTYPE *) palloc(size);
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SET_VARSIZE(res, size);
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res->flag = flag;
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if (!allistrue)
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{
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if (sign)
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memcpy(GETSIGN(res), sign, siglen);
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else
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memset(GETSIGN(res), 0, siglen);
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}
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return res;
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}
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/*********************************************************************
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** intbig functions
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*********************************************************************/
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static bool
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_intbig_overlap(GISTTYPE *a, ArrayType *b, int siglen)
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{
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int num = ARRNELEMS(b);
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int32 *ptr = ARRPTR(b);
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CHECKARRVALID(b);
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while (num--)
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{
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if (GETBIT(GETSIGN(a), HASHVAL(*ptr, siglen)))
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return true;
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ptr++;
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}
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return false;
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}
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static bool
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_intbig_contains(GISTTYPE *a, ArrayType *b, int siglen)
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{
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int num = ARRNELEMS(b);
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int32 *ptr = ARRPTR(b);
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CHECKARRVALID(b);
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while (num--)
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{
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if (!GETBIT(GETSIGN(a), HASHVAL(*ptr, siglen)))
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return false;
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ptr++;
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}
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return true;
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}
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Datum
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g_intbig_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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int siglen = GET_SIGLEN();
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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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int32 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(siglen)
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{
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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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PG_RETURN_POINTER(result);
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}
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Datum
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g_intbig_compress(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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int siglen = GET_SIGLEN();
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if (entry->leafkey)
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{
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GISTENTRY *retval;
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ArrayType *in = DatumGetArrayTypeP(entry->key);
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int32 *ptr;
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int num;
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GISTTYPE *res = _intbig_alloc(false, siglen, NULL);
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CHECKARRVALID(in);
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if (ARRISEMPTY(in))
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{
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ptr = NULL;
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num = 0;
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}
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else
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{
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ptr = ARRPTR(in);
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num = ARRNELEMS(in);
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}
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while (num--)
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{
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HASH(GETSIGN(res), *ptr, siglen);
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ptr++;
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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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PG_RETURN_POINTER(retval);
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}
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else if (!ISALLTRUE(DatumGetPointer(entry->key)))
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{
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GISTENTRY *retval;
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int i;
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BITVECP sign = GETSIGN(DatumGetPointer(entry->key));
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GISTTYPE *res;
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LOOPBYTE(siglen)
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{
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if ((sign[i] & 0xff) != 0xff)
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PG_RETURN_POINTER(entry);
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}
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res = _intbig_alloc(true, siglen, sign);
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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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PG_RETURN_POINTER(retval);
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}
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PG_RETURN_POINTER(entry);
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}
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static int32
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sizebitvec(BITVECP sign, int siglen)
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{
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return pg_popcount(sign, siglen);
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}
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static int
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hemdistsign(BITVECP a, BITVECP b, int siglen)
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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(siglen)
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{
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diff = (unsigned char) (a[i] ^ b[i]);
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/* Using the popcount functions here isn't likely to win */
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dist += pg_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, int siglen)
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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(siglen) - sizebitvec(GETSIGN(b), siglen);
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}
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else if (ISALLTRUE(b))
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return SIGLENBIT(siglen) - sizebitvec(GETSIGN(a), siglen);
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return hemdistsign(GETSIGN(a), GETSIGN(b), siglen);
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}
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Datum
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g_intbig_decompress(PG_FUNCTION_ARGS)
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{
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PG_RETURN_DATUM(PG_GETARG_DATUM(0));
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}
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static int32
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unionkey(BITVECP sbase, GISTTYPE *add, int siglen)
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{
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int32 i;
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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(siglen)
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sbase[i] |= sadd[i];
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return 0;
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}
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Datum
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g_intbig_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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int siglen = GET_SIGLEN();
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int32 i;
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GISTTYPE *result = _intbig_alloc(false, siglen, NULL);
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BITVECP base = GETSIGN(result);
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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), siglen))
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{
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result->flag |= ALLISTRUE;
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SET_VARSIZE(result, CALCGTSIZE(ALLISTRUE, siglen));
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break;
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}
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}
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*size = VARSIZE(result);
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PG_RETURN_POINTER(result);
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}
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Datum
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g_intbig_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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int siglen = GET_SIGLEN();
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*penalty = hemdist(origval, newval, siglen);
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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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OffsetNumber pos;
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int32 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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{
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return pg_cmp_s32(((const SPLITCOST *) a)->cost,
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((const SPLITCOST *) b)->cost);
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}
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Datum
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g_intbig_picksplit(PG_FUNCTION_ARGS)
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{
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GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
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GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
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int siglen = GET_SIGLEN();
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OffsetNumber k,
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j;
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GISTTYPE *datum_l,
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*datum_r;
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BITVECP union_l,
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union_r;
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int32 size_alpha,
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size_beta;
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int32 size_waste,
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waste = -1;
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int32 nbytes;
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OffsetNumber seed_1 = 0,
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seed_2 = 0;
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OffsetNumber *left,
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*right;
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OffsetNumber maxoff;
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BITVECP ptr;
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int i;
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SPLITCOST *costvector;
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GISTTYPE *_k,
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*_j;
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maxoff = entryvec->n - 2;
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nbytes = (maxoff + 2) * sizeof(OffsetNumber);
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v->spl_left = (OffsetNumber *) palloc(nbytes);
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v->spl_right = (OffsetNumber *) palloc(nbytes);
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for (k = FirstOffsetNumber; k < maxoff; k = OffsetNumberNext(k))
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{
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_k = GETENTRY(entryvec, k);
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for (j = OffsetNumberNext(k); j <= maxoff; j = OffsetNumberNext(j))
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{
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size_waste = hemdist(_k, GETENTRY(entryvec, j), siglen);
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if (size_waste > waste)
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{
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waste = size_waste;
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seed_1 = k;
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seed_2 = j;
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}
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}
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}
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left = v->spl_left;
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v->spl_nleft = 0;
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right = v->spl_right;
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v->spl_nright = 0;
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if (seed_1 == 0 || seed_2 == 0)
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{
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seed_1 = 1;
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seed_2 = 2;
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}
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/* form initial .. */
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datum_l = _intbig_alloc(ISALLTRUE(GETENTRY(entryvec, seed_1)), siglen,
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GETSIGN(GETENTRY(entryvec, seed_1)));
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datum_r = _intbig_alloc(ISALLTRUE(GETENTRY(entryvec, seed_2)), siglen,
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GETSIGN(GETENTRY(entryvec, seed_2)));
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maxoff = OffsetNumberNext(maxoff);
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/* sort before ... */
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costvector = (SPLITCOST *) palloc(sizeof(SPLITCOST) * maxoff);
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for (j = FirstOffsetNumber; j <= maxoff; j = OffsetNumberNext(j))
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{
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costvector[j - 1].pos = j;
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_j = GETENTRY(entryvec, j);
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size_alpha = hemdist(datum_l, _j, siglen);
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size_beta = hemdist(datum_r, _j, siglen);
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costvector[j - 1].cost = abs(size_alpha - size_beta);
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}
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qsort(costvector, maxoff, sizeof(SPLITCOST), comparecost);
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union_l = GETSIGN(datum_l);
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union_r = GETSIGN(datum_r);
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for (k = 0; k < maxoff; k++)
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{
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j = costvector[k].pos;
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if (j == seed_1)
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{
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*left++ = j;
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v->spl_nleft++;
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continue;
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}
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else if (j == seed_2)
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{
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*right++ = j;
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v->spl_nright++;
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continue;
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}
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_j = GETENTRY(entryvec, j);
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size_alpha = hemdist(datum_l, _j, siglen);
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size_beta = hemdist(datum_r, _j, siglen);
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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 (ISALLTRUE(datum_l) || ISALLTRUE(_j))
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{
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if (!ISALLTRUE(datum_l))
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memset(union_l, 0xff, siglen);
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}
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else
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{
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ptr = GETSIGN(_j);
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LOOPBYTE(siglen)
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union_l[i] |= ptr[i];
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}
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*left++ = j;
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v->spl_nleft++;
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}
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else
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{
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if (ISALLTRUE(datum_r) || ISALLTRUE(_j))
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{
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if (!ISALLTRUE(datum_r))
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memset(union_r, 0xff, siglen);
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}
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else
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{
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ptr = GETSIGN(_j);
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LOOPBYTE(siglen)
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union_r[i] |= ptr[i];
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}
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*right++ = j;
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v->spl_nright++;
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}
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}
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*right = *left = FirstOffsetNumber;
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pfree(costvector);
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v->spl_ldatum = PointerGetDatum(datum_l);
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v->spl_rdatum = PointerGetDatum(datum_r);
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PG_RETURN_POINTER(v);
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}
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Datum
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g_intbig_consistent(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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ArrayType *query = PG_GETARG_ARRAYTYPE_P(1);
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StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
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/* Oid subtype = PG_GETARG_OID(3); */
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bool *recheck = (bool *) PG_GETARG_POINTER(4);
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int siglen = GET_SIGLEN();
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bool retval;
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/* All cases served by this function are inexact */
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*recheck = true;
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if (ISALLTRUE(DatumGetPointer(entry->key)))
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PG_RETURN_BOOL(true);
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if (strategy == BooleanSearchStrategy)
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{
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retval = signconsistent((QUERYTYPE *) query,
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GETSIGN(DatumGetPointer(entry->key)),
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siglen,
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false);
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PG_FREE_IF_COPY(query, 1);
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PG_RETURN_BOOL(retval);
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}
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CHECKARRVALID(query);
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switch (strategy)
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{
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case RTOverlapStrategyNumber:
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retval = _intbig_overlap((GISTTYPE *) DatumGetPointer(entry->key),
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query, siglen);
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break;
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case RTSameStrategyNumber:
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if (GIST_LEAF(entry))
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{
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int i,
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num = ARRNELEMS(query);
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int32 *ptr = ARRPTR(query);
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BITVECP dq = palloc0(siglen),
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de;
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while (num--)
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{
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HASH(dq, *ptr, siglen);
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ptr++;
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}
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de = GETSIGN((GISTTYPE *) DatumGetPointer(entry->key));
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retval = true;
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LOOPBYTE(siglen)
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{
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if (de[i] != dq[i])
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{
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retval = false;
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break;
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}
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}
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pfree(dq);
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}
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else
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retval = _intbig_contains((GISTTYPE *) DatumGetPointer(entry->key),
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query, siglen);
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break;
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case RTContainsStrategyNumber:
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case RTOldContainsStrategyNumber:
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retval = _intbig_contains((GISTTYPE *) DatumGetPointer(entry->key),
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query, siglen);
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break;
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case RTContainedByStrategyNumber:
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case RTOldContainedByStrategyNumber:
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/*
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* This code is unreachable as of intarray 1.4, because the <@
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* operator has been removed from the opclass. We keep it for now
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* to support older versions of the SQL definitions.
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*/
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if (GIST_LEAF(entry))
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{
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|
int i,
|
|
num = ARRNELEMS(query);
|
|
int32 *ptr = ARRPTR(query);
|
|
BITVECP dq = palloc0(siglen),
|
|
de;
|
|
|
|
while (num--)
|
|
{
|
|
HASH(dq, *ptr, siglen);
|
|
ptr++;
|
|
}
|
|
|
|
de = GETSIGN((GISTTYPE *) DatumGetPointer(entry->key));
|
|
retval = true;
|
|
LOOPBYTE(siglen)
|
|
{
|
|
if (de[i] & ~dq[i])
|
|
{
|
|
retval = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Unfortunately, because empty arrays could be anywhere in
|
|
* the index, we must search the whole tree.
|
|
*/
|
|
retval = true;
|
|
}
|
|
break;
|
|
default:
|
|
retval = false;
|
|
}
|
|
PG_FREE_IF_COPY(query, 1);
|
|
PG_RETURN_BOOL(retval);
|
|
}
|
|
|
|
Datum
|
|
g_intbig_options(PG_FUNCTION_ARGS)
|
|
{
|
|
local_relopts *relopts = (local_relopts *) PG_GETARG_POINTER(0);
|
|
|
|
init_local_reloptions(relopts, sizeof(GISTIntArrayBigOptions));
|
|
add_local_int_reloption(relopts, "siglen",
|
|
"signature length in bytes",
|
|
SIGLEN_DEFAULT, 1, SIGLEN_MAX,
|
|
offsetof(GISTIntArrayBigOptions, siglen));
|
|
|
|
PG_RETURN_VOID();
|
|
}
|