mirror of
https://github.com/postgres/postgres.git
synced 2025-10-29 22:49:41 +03:00
649 lines
13 KiB
C
649 lines
13 KiB
C
/*
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* GiST support for ltree[]
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* Teodor Sigaev <teodor@stack.net>
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*/
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#include "ltree.h"
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#include "access/gist.h"
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#include "access/rtree.h"
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#include "access/nbtree.h"
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#include "utils/array.h"
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#include "crc32.h"
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PG_FUNCTION_INFO_V1(_ltree_compress);
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Datum _ltree_compress(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(_ltree_same);
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Datum _ltree_same(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(_ltree_union);
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Datum _ltree_union(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(_ltree_penalty);
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Datum _ltree_penalty(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(_ltree_picksplit);
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Datum _ltree_picksplit(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(_ltree_consistent);
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Datum _ltree_consistent(PG_FUNCTION_ARGS);
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#define GETENTRY(vec,pos) ((ltree_gist *) DatumGetPointer(((GISTENTRY *) VARDATA(vec))[(pos)].key))
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#define NEXTVAL(x) ( (ltree*)( (char*)(x) + INTALIGN( VARSIZE(x) ) ) )
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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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#define WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
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static void
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hashing(BITVECP sign, ltree * t)
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{
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int tlen = t->numlevel;
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ltree_level *cur = LTREE_FIRST(t);
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int hash;
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while (tlen > 0)
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{
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hash = ltree_crc32_sz(cur->name, cur->len);
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AHASH(sign, hash);
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cur = LEVEL_NEXT(cur);
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tlen--;
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}
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}
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Datum
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_ltree_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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{ /* ltree */
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ltree_gist *key;
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ArrayType *val = DatumGetArrayTypeP(entry->key);
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int4 len = LTG_HDRSIZE + ASIGLEN;
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int num = ArrayGetNItems(ARR_NDIM(val), ARR_DIMS(val));
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ltree *item = (ltree *) ARR_DATA_PTR(val);
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if (ARR_NDIM(val) != 1)
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elog(ERROR, "Dimension of array != 1");
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key = (ltree_gist *) palloc(len);
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key->len = len;
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key->flag = 0;
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MemSet(LTG_SIGN(key), 0, sizeof(ASIGLEN));
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while (num > 0)
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{
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hashing(LTG_SIGN(key), item);
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num--;
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item = NEXTVAL(item);
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}
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if (PointerGetDatum(val) != entry->key)
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pfree(val);
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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, key->len, FALSE);
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}
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else
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{
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int4 i,
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len;
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ltree_gist *key;
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BITVECP sign = LTG_SIGN(DatumGetPointer(entry->key));
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ALOOPBYTE(
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if (sign[i] != 0xff)
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PG_RETURN_POINTER(retval);
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);
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len = LTG_HDRSIZE;
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key = (ltree_gist *) palloc(len);
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key->len = len;
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key->flag = LTG_ALLTRUE;
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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, key->len, 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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_ltree_same(PG_FUNCTION_ARGS)
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{
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ltree_gist *a = (ltree_gist *) PG_GETARG_POINTER(0);
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ltree_gist *b = (ltree_gist *) PG_GETARG_POINTER(1);
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bool *result = (bool *) PG_GETARG_POINTER(2);
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if (LTG_ISALLTRUE(a) && LTG_ISALLTRUE(b))
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*result = true;
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else if (LTG_ISALLTRUE(a))
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*result = false;
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else if (LTG_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 = LTG_SIGN(a),
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sb = LTG_SIGN(b);
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*result = true;
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ALOOPBYTE(
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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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static int4
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unionkey(BITVECP sbase, ltree_gist * add)
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{
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int4 i;
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BITVECP sadd = LTG_SIGN(add);
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if (LTG_ISALLTRUE(add))
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return 1;
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ALOOPBYTE(
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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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_ltree_union(PG_FUNCTION_ARGS)
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{
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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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ABITVEC 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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ltree_gist *result;
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MemSet((void *) base, 0, sizeof(ABITVEC));
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for (i = 0; i < len; i++)
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{
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if (unionkey(base, GETENTRY(entryvec, i)))
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{
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flag = LTG_ALLTRUE;
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break;
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}
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}
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len = LTG_HDRSIZE + ((flag & LTG_ALLTRUE) ? 0 : ASIGLEN);
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result = (ltree_gist *) palloc(len);
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*size = result->len = len;
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result->flag = flag;
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if (!LTG_ISALLTRUE(result))
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memcpy((void *) LTG_SIGN(result), (void *) base, sizeof(ABITVEC));
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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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ALOOPBYTE(
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size += SUMBIT(*(char *) 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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Datum
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_ltree_penalty(PG_FUNCTION_ARGS)
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{
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ltree_gist *origval = (ltree_gist *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
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ltree_gist *newval = (ltree_gist *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
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float *penalty = (float *) PG_GETARG_POINTER(2);
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BITVECP orig = LTG_SIGN(origval);
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if (LTG_ISALLTRUE(origval))
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{
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*penalty = 0.0;
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PG_RETURN_POINTER(penalty);
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}
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if (LTG_ISALLTRUE(newval))
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*penalty = (float) (ASIGLENBIT - sizebitvec(orig));
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else
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{
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unsigned char valtmp;
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BITVECP nval = LTG_SIGN(newval);
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int4 i,
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unionsize = 0;
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ALOOPBYTE(
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valtmp = nval[i] | orig[i];
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unionsize += SUMBIT(valtmp) - SUMBIT(orig[i]);
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);
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*penalty = (float) unionsize;
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}
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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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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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{
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return ((SPLITCOST *) a)->cost - ((SPLITCOST *) b)->cost;
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}
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Datum
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_ltree_picksplit(PG_FUNCTION_ARGS)
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{
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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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ltree_gist *datum_l,
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*datum_r;
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ABITVEC union_l,
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union_r;
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bool firsttime = true;
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int4 size_alpha,
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size_beta,
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sizeu,
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sizei;
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int4 size_waste,
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waste = 0.0;
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int4 size_l,
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size_r;
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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 ptra,
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ptrb,
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ptrc;
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int i;
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unsigned char valtmp;
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SPLITCOST *costvector;
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ltree_gist *_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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{
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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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_j = GETENTRY(entryvec, j);
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if (LTG_ISALLTRUE(_k) || LTG_ISALLTRUE(_j))
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{
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sizeu = ASIGLENBIT;
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if (LTG_ISALLTRUE(_k) && LTG_ISALLTRUE(_j))
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sizei = ASIGLENBIT;
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else
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sizei = (LTG_ISALLTRUE(_k)) ?
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sizebitvec(LTG_SIGN(_j)) : sizebitvec(LTG_SIGN(_k));
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}
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else
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{
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sizeu = sizei = 0;
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ptra = LTG_SIGN(_j);
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ptrb = LTG_SIGN(_k);
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/* critical section for bench !!! */
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#define COUNT(pos) do { \
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if ( GETBITBYTE(*(char*)ptra,pos) ) { \
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sizeu++; \
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if ( GETBITBYTE(*(char*)ptrb, pos) ) \
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sizei++; \
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} else if ( GETBITBYTE(*(char*)ptrb, pos) ) \
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sizeu++; \
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} while(0)
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ALOOPBYTE(
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COUNT(0);
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COUNT(1);
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COUNT(2);
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COUNT(3);
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COUNT(4);
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COUNT(5);
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COUNT(6);
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COUNT(7);
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ptra = (BITVECP) (((char *) ptra) + 1);
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ptrb = (BITVECP) (((char *) ptrb) + 1);
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);
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}
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size_waste = sizeu - sizei;
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if (size_waste > waste || firsttime)
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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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firsttime = false;
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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 (LTG_ISALLTRUE(GETENTRY(entryvec, seed_1)))
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{
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datum_l = (ltree_gist *) palloc(LTG_HDRSIZE);
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datum_l->len = LTG_HDRSIZE;
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datum_l->flag = LTG_ALLTRUE;
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size_l = ASIGLENBIT;
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}
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else
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{
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datum_l = (ltree_gist *) palloc(LTG_HDRSIZE + ASIGLEN);
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datum_l->len = LTG_HDRSIZE + ASIGLEN;
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datum_l->flag = 0;
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memcpy((void *) LTG_SIGN(datum_l), (void *) LTG_SIGN(GETENTRY(entryvec, seed_1)), sizeof(ABITVEC));
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size_l = sizebitvec(LTG_SIGN(datum_l));
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}
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if (LTG_ISALLTRUE(GETENTRY(entryvec, seed_2)))
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{
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datum_r = (ltree_gist *) palloc(LTG_HDRSIZE);
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datum_r->len = LTG_HDRSIZE;
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datum_r->flag = LTG_ALLTRUE;
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size_r = ASIGLENBIT;
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}
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else
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{
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datum_r = (ltree_gist *) palloc(LTG_HDRSIZE + ASIGLEN);
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datum_r->len = LTG_HDRSIZE + ASIGLEN;
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datum_r->flag = 0;
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memcpy((void *) LTG_SIGN(datum_r), (void *) LTG_SIGN(GETENTRY(entryvec, seed_2)), sizeof(ABITVEC));
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size_r = sizebitvec(LTG_SIGN(datum_r));
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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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if (LTG_ISALLTRUE(_j))
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{
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size_alpha = ASIGLENBIT - size_l;
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size_beta = ASIGLENBIT - size_r;
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}
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else
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{
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ptra = LTG_SIGN(datum_l);
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ptrb = LTG_SIGN(datum_r);
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ptrc = LTG_SIGN(_j);
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size_beta = size_alpha = 0;
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if (LTG_ISALLTRUE(datum_l))
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{
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if (!LTG_ISALLTRUE(datum_r))
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{
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ALOOPBIT(
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if (GETBIT(ptrc, i) && !GETBIT(ptrb, i))
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size_beta++;
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);
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}
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}
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else if (LTG_ISALLTRUE(datum_r))
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{
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if (!LTG_ISALLTRUE(datum_l))
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{
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ALOOPBIT(
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if (GETBIT(ptrc, i) && !GETBIT(ptra, i))
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size_alpha++;
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);
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}
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}
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else
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{
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ALOOPBIT(
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if (GETBIT(ptrc, i) && !GETBIT(ptra, i))
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size_alpha++;
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if (GETBIT(ptrc, i) && !GETBIT(ptrb, i))
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size_beta++;
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);
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}
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}
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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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for (k = 0; k < maxoff; k++)
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{
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j = costvector[k].pos;
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_j = GETENTRY(entryvec, j);
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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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if (LTG_ISALLTRUE(datum_l) || LTG_ISALLTRUE(_j))
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size_alpha = ASIGLENBIT;
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else
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{
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ptra = LTG_SIGN(_j);
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ptrb = LTG_SIGN(datum_l);
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size_alpha = 0;
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ALOOPBYTE(
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valtmp = union_l[i] = ptra[i] | ptrb[i];
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size_alpha += SUMBIT(valtmp);
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);
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}
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if (LTG_ISALLTRUE(datum_r) || LTG_ISALLTRUE(_j))
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size_beta = ASIGLENBIT;
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else
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{
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ptra = LTG_SIGN(_j);
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ptrb = LTG_SIGN(datum_r);
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size_beta = 0;
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ALOOPBYTE(
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valtmp = union_r[i] = ptra[i] | ptrb[i];
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size_beta += SUMBIT(valtmp);
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);
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}
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if (size_alpha - size_l < size_beta - size_r + WISH_F(v->spl_nleft, v->spl_nright, 0.1))
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{
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if (!LTG_ISALLTRUE(datum_l))
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{
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if (size_alpha == ASIGLENBIT)
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{
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if (size_alpha != size_l)
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MemSet((void *) LTG_SIGN(datum_l), 0xff, sizeof(ABITVEC));
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}
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else
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memcpy((void *) LTG_SIGN(datum_l), (void *) union_l, sizeof(ABITVEC));
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}
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size_l = size_alpha;
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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 (!LTG_ISALLTRUE(datum_r))
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{
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if (size_beta == ASIGLENBIT)
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{
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if (size_beta != size_r)
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MemSet((void *) LTG_SIGN(datum_r), 0xff, sizeof(ABITVEC));
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}
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else
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memcpy((void *) LTG_SIGN(datum_r), (void *) union_r, sizeof(ABITVEC));
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}
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size_r = size_beta;
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*right++ = j;
|
|
v->spl_nright++;
|
|
}
|
|
}
|
|
|
|
*right = *left = FirstOffsetNumber;
|
|
pfree(costvector);
|
|
|
|
v->spl_ldatum = PointerGetDatum(datum_l);
|
|
v->spl_rdatum = PointerGetDatum(datum_r);
|
|
|
|
PG_RETURN_POINTER(v);
|
|
}
|
|
|
|
static bool
|
|
gist_te(ltree_gist * key, ltree * query)
|
|
{
|
|
ltree_level *curq = LTREE_FIRST(query);
|
|
BITVECP sign = LTG_SIGN(key);
|
|
int qlen = query->numlevel;
|
|
unsigned int hv;
|
|
|
|
if (LTG_ISALLTRUE(key))
|
|
return true;
|
|
|
|
while (qlen > 0)
|
|
{
|
|
hv = ltree_crc32_sz(curq->name, curq->len);
|
|
if (!GETBIT(sign, AHASHVAL(hv)))
|
|
return false;
|
|
curq = LEVEL_NEXT(curq);
|
|
qlen--;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
checkcondition_bit(void *checkval, ITEM * val)
|
|
{
|
|
return (FLG_CANLOOKSIGN(val->flag)) ? GETBIT(checkval, AHASHVAL(val->val)) : true;
|
|
}
|
|
|
|
static bool
|
|
gist_qtxt(ltree_gist * key, ltxtquery * query)
|
|
{
|
|
if (LTG_ISALLTRUE(key))
|
|
return true;
|
|
|
|
return ltree_execute(
|
|
GETQUERY(query),
|
|
(void *) LTG_SIGN(key), false,
|
|
checkcondition_bit
|
|
);
|
|
}
|
|
|
|
static bool
|
|
gist_qe(ltree_gist * key, lquery * query)
|
|
{
|
|
lquery_level *curq = LQUERY_FIRST(query);
|
|
BITVECP sign = LTG_SIGN(key);
|
|
int qlen = query->numlevel;
|
|
|
|
if (LTG_ISALLTRUE(key))
|
|
return true;
|
|
|
|
while (qlen > 0)
|
|
{
|
|
if (curq->numvar && LQL_CANLOOKSIGN(curq))
|
|
{
|
|
bool isexist = false;
|
|
int vlen = curq->numvar;
|
|
lquery_variant *curv = LQL_FIRST(curq);
|
|
|
|
while (vlen > 0)
|
|
{
|
|
if (GETBIT(sign, AHASHVAL(curv->val)))
|
|
{
|
|
isexist = true;
|
|
break;
|
|
}
|
|
curv = LVAR_NEXT(curv);
|
|
vlen--;
|
|
}
|
|
if (!isexist)
|
|
return false;
|
|
}
|
|
|
|
curq = LQL_NEXT(curq);
|
|
qlen--;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
Datum
|
|
_ltree_consistent(PG_FUNCTION_ARGS)
|
|
{
|
|
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
|
|
char *query = (char *) DatumGetPointer(PG_DETOAST_DATUM(PG_GETARG_DATUM(1)));
|
|
ltree_gist *key = (ltree_gist *) DatumGetPointer(entry->key);
|
|
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
|
|
bool res = false;
|
|
|
|
#ifndef assert_enabled
|
|
#define assert_enabled 0
|
|
#endif
|
|
|
|
switch (strategy)
|
|
{
|
|
case 10:
|
|
case 11:
|
|
res = gist_te(key, (ltree *) query);
|
|
break;
|
|
case 12:
|
|
case 13:
|
|
res = gist_qe(key, (lquery *) query);
|
|
break;
|
|
case 14:
|
|
case 15:
|
|
res = gist_qtxt(key, (ltxtquery *) query);
|
|
break;
|
|
default:
|
|
elog(ERROR, "Unknown StrategyNumber: %d", strategy);
|
|
}
|
|
PG_RETURN_BOOL(res);
|
|
}
|