mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-21 08:29:39 +08:00
523 lines
14 KiB
C
523 lines
14 KiB
C
#include "_int.h"
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#define GETENTRY(vec,pos) ((GISTTYPE *) DatumGetPointer(((GISTENTRY *) VARDATA(vec))[(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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Datum g_intbig_consistent(PG_FUNCTION_ARGS);
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Datum g_intbig_compress(PG_FUNCTION_ARGS);
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Datum g_intbig_decompress(PG_FUNCTION_ARGS);
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Datum g_intbig_penalty(PG_FUNCTION_ARGS);
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Datum g_intbig_picksplit(PG_FUNCTION_ARGS);
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Datum g_intbig_union(PG_FUNCTION_ARGS);
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Datum g_intbig_same(PG_FUNCTION_ARGS);
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#define SUMBIT(val) ( \
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GETBITBYTE((val),0) + \
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GETBITBYTE((val),1) + \
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GETBITBYTE((val),2) + \
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GETBITBYTE((val),3) + \
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GETBITBYTE((val),4) + \
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GETBITBYTE((val),5) + \
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GETBITBYTE((val),6) + \
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GETBITBYTE((val),7) \
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)
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PG_FUNCTION_INFO_V1(_intbig_in);
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Datum _intbig_in(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(_intbig_out);
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Datum _intbig_out(PG_FUNCTION_ARGS);
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Datum
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_intbig_in(PG_FUNCTION_ARGS) {
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elog(ERROR, "Not implemented");
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PG_RETURN_DATUM(0);
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}
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Datum
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_intbig_out(PG_FUNCTION_ARGS) {
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elog(ERROR, "Not implemented");
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PG_RETURN_DATUM(0);
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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)
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{
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int num=ARRNELEMS(b);
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int4 *ptr=ARRPTR(b);
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while(num--) {
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if (GETBIT(GETSIGN(a),HASHVAL(*ptr)))
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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)
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{
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int num=ARRNELEMS(b);
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int4 *ptr=ARRPTR(b);
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while(num--) {
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if (!GETBIT(GETSIGN(a),HASHVAL(*ptr)))
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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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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 (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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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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*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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if (entry->leafkey) {
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GISTENTRY *retval;
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ArrayType *in = (ArrayType *) PG_DETOAST_DATUM(entry->key);
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int4 *ptr;
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int num;
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GISTTYPE *res=(GISTTYPE*)palloc(CALCGTSIZE(0));
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ARRISVOID(in);
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ptr=ARRPTR(in);
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num=ARRNELEMS(in);
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memset(res,0,CALCGTSIZE(0));
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res->len=CALCGTSIZE(0);
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while(num--) {
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HASH(GETSIGN(res),*ptr);
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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, res->len, FALSE);
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if ( in!=(ArrayType *) PG_DETOAST_DATUM(entry->key) )
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pfree(in);
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PG_RETURN_POINTER(retval);
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} else if ( !ISALLTRUE(DatumGetPointer(entry->key)) ) {
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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(
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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=(GISTTYPE*)palloc(CALCGTSIZE(ALLISTRUE));
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res->len=CALCGTSIZE(ALLISTRUE);
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res->flag = 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, res->len, 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 int4
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sizebitvec(BITVECP sign) {
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int4 size = 0, i;
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LOOPBYTE(
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size += SUMBIT(sign);
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sign = (BITVECP) (((char *) sign) + 1);
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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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int i,dist=0;
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LOOPBIT(
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if ( GETBIT(a,i) != GETBIT(b,i) )
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dist++;
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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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if ( ISALLTRUE(a) ) {
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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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} 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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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 int4
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unionkey(BITVECP sbase, GISTTYPE * add)
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{
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int4 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(
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sbase[i] |= sadd[i];
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);
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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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bytea *entryvec = (bytea *) 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 len = (VARSIZE(entryvec) - VARHDRSZ) / sizeof(GISTENTRY);
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int4 i;
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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 < len; i++) {
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if (unionkey(base, GETENTRY(entryvec, i))) {
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flag = ALLISTRUE;
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break;
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}
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}
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len = CALCGTSIZE(flag);
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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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g_intbig_penalty(PG_FUNCTION_ARGS) {
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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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*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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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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return ((SPLITCOST *) a)->cost - ((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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bytea *entryvec = (bytea *) PG_GETARG_POINTER(0);
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GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
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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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int4 size_alpha, size_beta;
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int4 size_waste,
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waste = -1;
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int4 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 = ((VARSIZE(entryvec) - VARHDRSZ) / sizeof(GISTENTRY)) - 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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_k = GETENTRY(entryvec, k);
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for (j = OffsetNumberNext(k); j <= maxoff; j = OffsetNumberNext(j)) {
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size_waste=hemdist(_k, GETENTRY(entryvec, j));
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if (size_waste > waste ) {
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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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if (ISALLTRUE(GETENTRY(entryvec, seed_1)))
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{
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datum_l = (GISTTYPE *) palloc(GTHDRSIZE);
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datum_l->len = GTHDRSIZE;
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datum_l->flag = ALLISTRUE;
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}
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else
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{
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datum_l = (GISTTYPE *) palloc(GTHDRSIZE + SIGLEN);
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datum_l->len = GTHDRSIZE + SIGLEN;
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datum_l->flag = 0;
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memcpy((void *) GETSIGN(datum_l), (void *) GETSIGN(GETENTRY(entryvec, seed_1)), sizeof(BITVEC));
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}
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if (ISALLTRUE(GETENTRY(entryvec, seed_2)))
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{
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datum_r = (GISTTYPE *) palloc(GTHDRSIZE);
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datum_r->len = GTHDRSIZE;
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datum_r->flag = ALLISTRUE;
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}
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else
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{
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datum_r = (GISTTYPE *) palloc(GTHDRSIZE + SIGLEN);
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datum_r->len = GTHDRSIZE + SIGLEN;
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datum_r->flag = 0;
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memcpy((void *) GETSIGN(datum_r), (void *) GETSIGN(GETENTRY(entryvec, seed_2)), sizeof(BITVEC));
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}
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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);
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size_beta = hemdist(datum_r,_j);
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costvector[j - 1].cost = abs(size_alpha - size_beta);
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}
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qsort((void *) 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);
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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 (ISALLTRUE(datum_l) || ISALLTRUE(_j) ) {
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if (!ISALLTRUE(datum_l))
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MemSet((void *) union_l, 0xff, sizeof(BITVEC));
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} else {
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ptr=GETSIGN(_j);
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LOOPBYTE(
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union_l[i] |= ptr[i];
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);
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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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if (!ISALLTRUE(datum_r))
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MemSet((void *) union_r, 0xff, sizeof(BITVEC));
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} else {
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ptr=GETSIGN(_j);
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LOOPBYTE(
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union_r[i] |= ptr[i];
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);
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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 = (ArrayType *) PG_GETARG_POINTER(1);
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StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
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bool retval;
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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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PG_RETURN_BOOL(signconsistent((QUERYTYPE *) query,
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GETSIGN(DatumGetPointer(entry->key)),
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false));
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}
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/* XXX what about toasted input? */
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if (ARRISVOID(query))
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return FALSE;
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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), query);
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break;
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case RTSameStrategyNumber:
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if (GIST_LEAF(entry)) {
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int i,num=ARRNELEMS(query);
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int4 *ptr=ARRPTR(query);
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BITVEC qp;
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BITVECP dq, de;
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memset(qp,0,sizeof(BITVEC));
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while(num--) {
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HASH(qp, *ptr);
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ptr++;
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}
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de=GETSIGN((GISTTYPE *) DatumGetPointer(entry->key));
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dq=qp;
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retval=true;
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LOOPBYTE(
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if ( de[i] != dq[i] ) {
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retval=false;
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break;
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}
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);
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} else
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retval = _intbig_contains((GISTTYPE *) DatumGetPointer(entry->key), query);
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break;
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case RTContainsStrategyNumber:
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retval = _intbig_contains((GISTTYPE *) DatumGetPointer(entry->key), query);
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break;
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case RTContainedByStrategyNumber:
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if (GIST_LEAF(entry)) {
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int i,num=ARRNELEMS(query);
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int4 *ptr=ARRPTR(query);
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BITVEC qp;
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BITVECP dq, de;
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memset(qp,0,sizeof(BITVEC));
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while(num--) {
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HASH(qp, *ptr);
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ptr++;
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}
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de=GETSIGN((GISTTYPE *) DatumGetPointer(entry->key));
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dq=qp;
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retval=true;
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LOOPBYTE(
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if ( de[i] & ~dq[i] ) {
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retval=false;
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break;
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}
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);
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} else
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retval = _intbig_overlap((GISTTYPE *) DatumGetPointer(entry->key), query);
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break;
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default:
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retval = FALSE;
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}
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PG_RETURN_BOOL(retval);
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}
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