mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-07-26 15:13:26 +02:00
29d2f86a31
The main motivation for changing this is bug #4921, in which it's pointed out that it's no longer safe to apply ltree operations to the result of ARRAY(SELECT ...) if the sub-select might return no rows. Before 8.3, the ARRAY() construct would return NULL, which might or might not be helpful but at least it wouldn't result in an error. Now it returns an empty array which results in a failure for no good reason, since the ltree operations are all perfectly capable of dealing with zero-element arrays. As far as I can find, these ltree functions are the only places where zero array dimensionality is rejected unnecessarily. Back-patch to 8.3 to prevent behavioral regression of queries that worked in older releases.
596 lines
13 KiB
C
596 lines
13 KiB
C
/*
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* $PostgreSQL: pgsql/contrib/ltree/_ltree_gist.c,v 1.27 2010/02/24 18:02:24 tgl Exp $
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*
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*
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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 "postgres.h"
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#include "access/gist.h"
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#include "access/skey.h"
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#include "utils/array.h"
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#include "crc32.h"
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#include "ltree.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((vec)->vector[(pos)].key))
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#define NEXTVAL(x) ( (ltree*)( (char*)(x) + INTALIGN( VARSIZE(x) ) ) )
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/* Number of one-bits in an unsigned byte */
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static const uint8 number_of_ones[256] = {
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0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
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};
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#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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ereport(ERROR,
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(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
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errmsg("array must be one-dimensional")));
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if (ARR_HASNULL(val))
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ereport(ERROR,
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(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
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errmsg("array must not contain nulls")));
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key = (ltree_gist *) palloc(len);
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SET_VARSIZE(key, len);
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key->flag = 0;
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MemSet(LTG_SIGN(key), 0, 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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retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
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gistentryinit(*retval, PointerGetDatum(key),
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entry->rel, entry->page,
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entry->offset, FALSE);
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}
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else if (!LTG_ISALLTRUE(entry->key))
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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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{
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if ((sign[i] & 0xff) != 0xff)
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PG_RETURN_POINTER(retval);
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}
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len = LTG_HDRSIZE;
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key = (ltree_gist *) palloc(len);
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SET_VARSIZE(key, 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, 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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{
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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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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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GistEntryVector *entryvec = (GistEntryVector *) 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 i,
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len;
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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 < entryvec->n; i++)
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{
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if (unionkey(base, GETENTRY(entryvec, i)))
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{
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flag = 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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SET_VARSIZE(result, 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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*size = len;
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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 += number_of_ones[(unsigned char) sign[i]];
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return size;
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}
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static int
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hemdistsign(BITVECP a, BITVECP b)
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{
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int i,
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diff,
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dist = 0;
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ALOOPBYTE
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{
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diff = (unsigned char) (a[i] ^ b[i]);
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dist += number_of_ones[diff];
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}
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return dist;
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}
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static int
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hemdist(ltree_gist *a, ltree_gist *b)
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{
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if (LTG_ISALLTRUE(a))
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{
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if (LTG_ISALLTRUE(b))
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return 0;
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else
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return ASIGLENBIT - sizebitvec(LTG_SIGN(b));
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}
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else if (LTG_ISALLTRUE(b))
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return ASIGLENBIT - sizebitvec(LTG_SIGN(a));
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return hemdistsign(LTG_SIGN(a), LTG_SIGN(b));
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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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*penalty = hemdist(origval, newval);
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PG_RETURN_POINTER(penalty);
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}
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typedef struct
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{
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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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GistEntryVector *entryvec = (GistEntryVector *) 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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BITVECP union_l,
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union_r;
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int4 size_alpha,
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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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ltree_gist *_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));
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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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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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SET_VARSIZE(datum_l, LTG_HDRSIZE);
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datum_l->flag = LTG_ALLTRUE;
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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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SET_VARSIZE(datum_l, 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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}
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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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SET_VARSIZE(datum_r, LTG_HDRSIZE);
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datum_r->flag = LTG_ALLTRUE;
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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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SET_VARSIZE(datum_r, 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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}
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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 = LTG_SIGN(datum_l);
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union_r = LTG_SIGN(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 (LTG_ISALLTRUE(datum_l) || LTG_ISALLTRUE(_j))
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{
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if (!LTG_ISALLTRUE(datum_l))
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MemSet((void *) union_l, 0xff, sizeof(ABITVEC));
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}
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else
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{
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ptr = LTG_SIGN(_j);
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ALOOPBYTE
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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 (LTG_ISALLTRUE(datum_r) || LTG_ISALLTRUE(_j))
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{
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if (!LTG_ISALLTRUE(datum_r))
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MemSet((void *) union_r, 0xff, sizeof(ABITVEC));
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}
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else
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{
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ptr = LTG_SIGN(_j);
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ALOOPBYTE
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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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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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static bool
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gist_te(ltree_gist *key, ltree *query)
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{
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ltree_level *curq = LTREE_FIRST(query);
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BITVECP sign = LTG_SIGN(key);
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int qlen = query->numlevel;
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unsigned int hv;
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if (LTG_ISALLTRUE(key))
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return true;
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while (qlen > 0)
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{
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hv = ltree_crc32_sz(curq->name, curq->len);
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if (!GETBIT(sign, AHASHVAL(hv)))
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return false;
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curq = LEVEL_NEXT(curq);
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qlen--;
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}
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return true;
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}
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static bool
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checkcondition_bit(void *checkval, ITEM *val)
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{
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return (FLG_CANLOOKSIGN(val->flag)) ? GETBIT(checkval, AHASHVAL(val->val)) : true;
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}
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static bool
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gist_qtxt(ltree_gist *key, ltxtquery *query)
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{
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if (LTG_ISALLTRUE(key))
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return true;
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return ltree_execute(
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GETQUERY(query),
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(void *) LTG_SIGN(key), false,
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checkcondition_bit
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);
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}
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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;
|
|
}
|
|
|
|
static bool
|
|
_arrq_cons(ltree_gist *key, ArrayType *_query)
|
|
{
|
|
lquery *query = (lquery *) ARR_DATA_PTR(_query);
|
|
int num = ArrayGetNItems(ARR_NDIM(_query), ARR_DIMS(_query));
|
|
|
|
if (ARR_NDIM(_query) > 1)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
|
|
errmsg("array must be one-dimensional")));
|
|
if (ARR_HASNULL(_query))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
|
|
errmsg("array must not contain nulls")));
|
|
|
|
while (num > 0)
|
|
{
|
|
if (gist_qe(key, query))
|
|
return true;
|
|
num--;
|
|
query = (lquery *) NEXTVAL(query);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
Datum
|
|
_ltree_consistent(PG_FUNCTION_ARGS)
|
|
{
|
|
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
|
|
char *query = (char *) DatumGetPointer(PG_DETOAST_DATUM(PG_GETARG_DATUM(1)));
|
|
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
|
|
|
|
/* Oid subtype = PG_GETARG_OID(3); */
|
|
bool *recheck = (bool *) PG_GETARG_POINTER(4);
|
|
ltree_gist *key = (ltree_gist *) DatumGetPointer(entry->key);
|
|
bool res = false;
|
|
|
|
/* All cases served by this function are inexact */
|
|
*recheck = true;
|
|
|
|
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;
|
|
case 16:
|
|
case 17:
|
|
res = _arrq_cons(key, (ArrayType *) query);
|
|
break;
|
|
default:
|
|
/* internal error */
|
|
elog(ERROR, "unrecognized StrategyNumber: %d", strategy);
|
|
}
|
|
PG_FREE_IF_COPY(query, 1);
|
|
PG_RETURN_BOOL(res);
|
|
}
|