diff options
Diffstat (limited to 'contrib/ltree/ltree_gist.c')
| -rw-r--r-- | contrib/ltree/ltree_gist.c | 731 |
1 files changed, 731 insertions, 0 deletions
diff --git a/contrib/ltree/ltree_gist.c b/contrib/ltree/ltree_gist.c new file mode 100644 index 0000000..d384e1f --- /dev/null +++ b/contrib/ltree/ltree_gist.c @@ -0,0 +1,731 @@ +/* + * GiST support for ltree + * Teodor Sigaev <teodor@stack.net> + * contrib/ltree/ltree_gist.c + */ +#include "postgres.h" + +#include "access/gist.h" +#include "access/reloptions.h" +#include "access/stratnum.h" +#include "crc32.h" +#include "ltree.h" + +#define NEXTVAL(x) ( (lquery*)( (char*)(x) + INTALIGN( VARSIZE(x) ) ) ) +#define ISEQ(a,b) ( (a)->numlevel == (b)->numlevel && ltree_compare(a,b)==0 ) + +PG_FUNCTION_INFO_V1(ltree_gist_in); +PG_FUNCTION_INFO_V1(ltree_gist_out); + +Datum +ltree_gist_in(PG_FUNCTION_ARGS) +{ + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("ltree_gist_in() not implemented"))); + PG_RETURN_DATUM(0); +} + +Datum +ltree_gist_out(PG_FUNCTION_ARGS) +{ + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("ltree_gist_out() not implemented"))); + PG_RETURN_DATUM(0); +} + +ltree_gist * +ltree_gist_alloc(bool isalltrue, BITVECP sign, int siglen, + ltree *left, ltree *right) +{ + int32 size = LTG_HDRSIZE + (isalltrue ? 0 : siglen) + + (left ? VARSIZE(left) + (right ? VARSIZE(right) : 0) : 0); + ltree_gist *result = palloc(size); + + SET_VARSIZE(result, size); + + if (siglen) + { + result->flag = 0; + + if (isalltrue) + result->flag |= LTG_ALLTRUE; + else if (sign) + memcpy(LTG_SIGN(result), sign, siglen); + else + memset(LTG_SIGN(result), 0, siglen); + + if (left) + { + memcpy(LTG_LNODE(result, siglen), left, VARSIZE(left)); + + if (!right || left == right || ISEQ(left, right)) + result->flag |= LTG_NORIGHT; + else + memcpy(LTG_RNODE(result, siglen), right, VARSIZE(right)); + } + } + else + { + Assert(left); + result->flag = LTG_ONENODE; + memcpy(LTG_NODE(result), left, VARSIZE(left)); + } + + return result; +} + +PG_FUNCTION_INFO_V1(ltree_compress); +PG_FUNCTION_INFO_V1(ltree_decompress); +PG_FUNCTION_INFO_V1(ltree_same); +PG_FUNCTION_INFO_V1(ltree_union); +PG_FUNCTION_INFO_V1(ltree_penalty); +PG_FUNCTION_INFO_V1(ltree_picksplit); +PG_FUNCTION_INFO_V1(ltree_consistent); +PG_FUNCTION_INFO_V1(ltree_gist_options); + +#define GETENTRY(vec,pos) ((ltree_gist *) DatumGetPointer((vec)->vector[(pos)].key)) + +Datum +ltree_compress(PG_FUNCTION_ARGS) +{ + GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0); + GISTENTRY *retval = entry; + + if (entry->leafkey) + { /* ltree */ + ltree *val = DatumGetLtreeP(entry->key); + ltree_gist *key = ltree_gist_alloc(false, NULL, 0, val, 0); + + retval = (GISTENTRY *) palloc(sizeof(GISTENTRY)); + gistentryinit(*retval, PointerGetDatum(key), + entry->rel, entry->page, + entry->offset, false); + } + PG_RETURN_POINTER(retval); +} + +Datum +ltree_decompress(PG_FUNCTION_ARGS) +{ + GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0); + ltree_gist *key = (ltree_gist *) PG_DETOAST_DATUM(entry->key); + + if (PointerGetDatum(key) != entry->key) + { + GISTENTRY *retval = (GISTENTRY *) palloc(sizeof(GISTENTRY)); + + gistentryinit(*retval, PointerGetDatum(key), + entry->rel, entry->page, + entry->offset, false); + PG_RETURN_POINTER(retval); + } + PG_RETURN_POINTER(entry); +} + +Datum +ltree_same(PG_FUNCTION_ARGS) +{ + ltree_gist *a = (ltree_gist *) PG_GETARG_POINTER(0); + ltree_gist *b = (ltree_gist *) PG_GETARG_POINTER(1); + bool *result = (bool *) PG_GETARG_POINTER(2); + int siglen = LTREE_GET_SIGLEN(); + + *result = false; + if (LTG_ISONENODE(a) != LTG_ISONENODE(b)) + PG_RETURN_POINTER(result); + + if (LTG_ISONENODE(a)) + *result = (ISEQ(LTG_NODE(a), LTG_NODE(b))) ? true : false; + else + { + int32 i; + BITVECP sa = LTG_SIGN(a), + sb = LTG_SIGN(b); + + if (LTG_ISALLTRUE(a) != LTG_ISALLTRUE(b)) + PG_RETURN_POINTER(result); + + if (!ISEQ(LTG_LNODE(a, siglen), LTG_LNODE(b, siglen))) + PG_RETURN_POINTER(result); + if (!ISEQ(LTG_RNODE(a, siglen), LTG_RNODE(b, siglen))) + PG_RETURN_POINTER(result); + + *result = true; + if (!LTG_ISALLTRUE(a)) + { + LOOPBYTE(siglen) + { + if (sa[i] != sb[i]) + { + *result = false; + break; + } + } + } + } + + PG_RETURN_POINTER(result); +} + +static void +hashing(BITVECP sign, ltree *t, int siglen) +{ + int tlen = t->numlevel; + ltree_level *cur = LTREE_FIRST(t); + int hash; + + while (tlen > 0) + { + hash = ltree_crc32_sz(cur->name, cur->len); + HASH(sign, hash, siglen); + cur = LEVEL_NEXT(cur); + tlen--; + } +} + +Datum +ltree_union(PG_FUNCTION_ARGS) +{ + GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0); + int *size = (int *) PG_GETARG_POINTER(1); + int siglen = LTREE_GET_SIGLEN(); + BITVECP base = palloc0(siglen); + int32 i, + j; + ltree_gist *result, + *cur; + ltree *left = NULL, + *right = NULL, + *curtree; + bool isalltrue = false; + + for (j = 0; j < entryvec->n; j++) + { + cur = GETENTRY(entryvec, j); + if (LTG_ISONENODE(cur)) + { + curtree = LTG_NODE(cur); + hashing(base, curtree, siglen); + if (!left || ltree_compare(left, curtree) > 0) + left = curtree; + if (!right || ltree_compare(right, curtree) < 0) + right = curtree; + } + else + { + if (isalltrue || LTG_ISALLTRUE(cur)) + isalltrue = true; + else + { + BITVECP sc = LTG_SIGN(cur); + + LOOPBYTE(siglen) + ((unsigned char *) base)[i] |= sc[i]; + } + + curtree = LTG_LNODE(cur, siglen); + if (!left || ltree_compare(left, curtree) > 0) + left = curtree; + curtree = LTG_RNODE(cur, siglen); + if (!right || ltree_compare(right, curtree) < 0) + right = curtree; + } + } + + if (isalltrue == false) + { + isalltrue = true; + LOOPBYTE(siglen) + { + if (((unsigned char *) base)[i] != 0xff) + { + isalltrue = false; + break; + } + } + } + + result = ltree_gist_alloc(isalltrue, base, siglen, left, right); + + *size = VARSIZE(result); + + PG_RETURN_POINTER(result); +} + +Datum +ltree_penalty(PG_FUNCTION_ARGS) +{ + ltree_gist *origval = (ltree_gist *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key); + ltree_gist *newval = (ltree_gist *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key); + float *penalty = (float *) PG_GETARG_POINTER(2); + int siglen = LTREE_GET_SIGLEN(); + int32 cmpr, + cmpl; + + cmpl = ltree_compare(LTG_GETLNODE(origval, siglen), LTG_GETLNODE(newval, siglen)); + cmpr = ltree_compare(LTG_GETRNODE(newval, siglen), LTG_GETRNODE(origval, siglen)); + + *penalty = Max(cmpl, 0) + Max(cmpr, 0); + + PG_RETURN_POINTER(penalty); +} + +/* used for sorting */ +typedef struct rix +{ + int index; + ltree *r; +} RIX; + +static int +treekey_cmp(const void *a, const void *b) +{ + return ltree_compare(((const RIX *) a)->r, + ((const RIX *) b)->r); +} + + +Datum +ltree_picksplit(PG_FUNCTION_ARGS) +{ + GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0); + GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1); + int siglen = LTREE_GET_SIGLEN(); + OffsetNumber j; + int32 i; + RIX *array; + OffsetNumber maxoff; + int nbytes; + ltree *lu_l, + *lu_r, + *ru_l, + *ru_r; + ltree_gist *lu, + *ru; + BITVECP ls = palloc0(siglen), + rs = palloc0(siglen); + bool lisat = false, + risat = false; + + maxoff = entryvec->n - 1; + nbytes = (maxoff + 2) * sizeof(OffsetNumber); + v->spl_left = (OffsetNumber *) palloc(nbytes); + v->spl_right = (OffsetNumber *) palloc(nbytes); + v->spl_nleft = 0; + v->spl_nright = 0; + array = (RIX *) palloc(sizeof(RIX) * (maxoff + 1)); + + /* copy the data into RIXes, and sort the RIXes */ + for (j = FirstOffsetNumber; j <= maxoff; j = OffsetNumberNext(j)) + { + array[j].index = j; + lu = GETENTRY(entryvec, j); /* use as tmp val */ + array[j].r = LTG_GETLNODE(lu, siglen); + } + + qsort((void *) &array[FirstOffsetNumber], maxoff - FirstOffsetNumber + 1, + sizeof(RIX), treekey_cmp); + + lu_l = lu_r = ru_l = ru_r = NULL; + for (j = FirstOffsetNumber; j <= maxoff; j = OffsetNumberNext(j)) + { + lu = GETENTRY(entryvec, array[j].index); /* use as tmp val */ + if (j <= (maxoff - FirstOffsetNumber + 1) / 2) + { + v->spl_left[v->spl_nleft] = array[j].index; + v->spl_nleft++; + if (lu_r == NULL || ltree_compare(LTG_GETRNODE(lu, siglen), lu_r) > 0) + lu_r = LTG_GETRNODE(lu, siglen); + if (LTG_ISONENODE(lu)) + hashing(ls, LTG_NODE(lu), siglen); + else + { + if (lisat || LTG_ISALLTRUE(lu)) + lisat = true; + else + { + BITVECP sc = LTG_SIGN(lu); + + LOOPBYTE(siglen) + ((unsigned char *) ls)[i] |= sc[i]; + } + } + } + else + { + v->spl_right[v->spl_nright] = array[j].index; + v->spl_nright++; + if (ru_r == NULL || ltree_compare(LTG_GETRNODE(lu, siglen), ru_r) > 0) + ru_r = LTG_GETRNODE(lu, siglen); + if (LTG_ISONENODE(lu)) + hashing(rs, LTG_NODE(lu), siglen); + else + { + if (risat || LTG_ISALLTRUE(lu)) + risat = true; + else + { + BITVECP sc = LTG_SIGN(lu); + + LOOPBYTE(siglen) + ((unsigned char *) rs)[i] |= sc[i]; + } + } + } + } + + if (lisat == false) + { + lisat = true; + LOOPBYTE(siglen) + { + if (((unsigned char *) ls)[i] != 0xff) + { + lisat = false; + break; + } + } + } + + if (risat == false) + { + risat = true; + LOOPBYTE(siglen) + { + if (((unsigned char *) rs)[i] != 0xff) + { + risat = false; + break; + } + } + } + + lu_l = LTG_GETLNODE(GETENTRY(entryvec, array[FirstOffsetNumber].index), siglen); + lu = ltree_gist_alloc(lisat, ls, siglen, lu_l, lu_r); + + ru_l = LTG_GETLNODE(GETENTRY(entryvec, array[1 + ((maxoff - FirstOffsetNumber + 1) / 2)].index), siglen); + ru = ltree_gist_alloc(risat, rs, siglen, ru_l, ru_r); + + pfree(ls); + pfree(rs); + + v->spl_ldatum = PointerGetDatum(lu); + v->spl_rdatum = PointerGetDatum(ru); + + PG_RETURN_POINTER(v); +} + +static bool +gist_isparent(ltree_gist *key, ltree *query, int siglen) +{ + int32 numlevel = query->numlevel; + int i; + + for (i = query->numlevel; i >= 0; i--) + { + query->numlevel = i; + if (ltree_compare(query, LTG_GETLNODE(key, siglen)) >= 0 && + ltree_compare(query, LTG_GETRNODE(key, siglen)) <= 0) + { + query->numlevel = numlevel; + return true; + } + } + + query->numlevel = numlevel; + return false; +} + +static ltree * +copy_ltree(ltree *src) +{ + ltree *dst = (ltree *) palloc0(VARSIZE(src)); + + memcpy(dst, src, VARSIZE(src)); + return dst; +} + +static bool +gist_ischild(ltree_gist *key, ltree *query, int siglen) +{ + ltree *left = copy_ltree(LTG_GETLNODE(key, siglen)); + ltree *right = copy_ltree(LTG_GETRNODE(key, siglen)); + bool res = true; + + if (left->numlevel > query->numlevel) + left->numlevel = query->numlevel; + + if (ltree_compare(query, left) < 0) + res = false; + + if (right->numlevel > query->numlevel) + right->numlevel = query->numlevel; + + if (res && ltree_compare(query, right) > 0) + res = false; + + pfree(left); + pfree(right); + + return res; +} + +static bool +gist_qe(ltree_gist *key, lquery *query, int siglen) +{ + 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, HASHVAL(curv->val, siglen))) + { + isexist = true; + break; + } + curv = LVAR_NEXT(curv); + vlen--; + } + if (!isexist) + return false; + } + + curq = LQL_NEXT(curq); + qlen--; + } + + return true; +} + +static int +gist_tqcmp(ltree *t, lquery *q) +{ + ltree_level *al = LTREE_FIRST(t); + lquery_level *ql = LQUERY_FIRST(q); + lquery_variant *bl; + int an = t->numlevel; + int bn = q->firstgood; + int res = 0; + + while (an > 0 && bn > 0) + { + bl = LQL_FIRST(ql); + if ((res = memcmp(al->name, bl->name, Min(al->len, bl->len))) == 0) + { + if (al->len != bl->len) + return al->len - bl->len; + } + else + return res; + an--; + bn--; + al = LEVEL_NEXT(al); + ql = LQL_NEXT(ql); + } + + return Min(t->numlevel, q->firstgood) - q->firstgood; +} + +static bool +gist_between(ltree_gist *key, lquery *query, int siglen) +{ + if (query->firstgood == 0) + return true; + + if (gist_tqcmp(LTG_GETLNODE(key, siglen), query) > 0) + return false; + + if (gist_tqcmp(LTG_GETRNODE(key, siglen), query) < 0) + return false; + + return true; +} + +typedef struct LtreeSignature +{ + BITVECP sign; + int siglen; +} LtreeSignature; + +static bool +checkcondition_bit(void *cxt, ITEM *val) +{ + LtreeSignature *sig = cxt; + + return (FLG_CANLOOKSIGN(val->flag)) ? GETBIT(sig->sign, HASHVAL(val->val, sig->siglen)) : true; +} + +static bool +gist_qtxt(ltree_gist *key, ltxtquery *query, int siglen) +{ + LtreeSignature sig; + + if (LTG_ISALLTRUE(key)) + return true; + + sig.sign = LTG_SIGN(key); + sig.siglen = siglen; + + return ltree_execute(GETQUERY(query), + &sig, false, + checkcondition_bit); +} + +static bool +arrq_cons(ltree_gist *key, ArrayType *_query, int siglen) +{ + 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 (array_contains_nulls(_query)) + ereport(ERROR, + (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED), + errmsg("array must not contain nulls"))); + + while (num > 0) + { + if (gist_qe(key, query, siglen) && gist_between(key, query, siglen)) + return true; + num--; + query = NEXTVAL(query); + } + return false; +} + +Datum +ltree_consistent(PG_FUNCTION_ARGS) +{ + GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0); + StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2); + + /* Oid subtype = PG_GETARG_OID(3); */ + bool *recheck = (bool *) PG_GETARG_POINTER(4); + int siglen = LTREE_GET_SIGLEN(); + ltree_gist *key = (ltree_gist *) DatumGetPointer(entry->key); + void *query = NULL; + bool res = false; + + /* All cases served by this function are exact */ + *recheck = false; + + switch (strategy) + { + case BTLessStrategyNumber: + query = PG_GETARG_LTREE_P(1); + res = (GIST_LEAF(entry)) ? + (ltree_compare((ltree *) query, LTG_NODE(key)) > 0) + : + (ltree_compare((ltree *) query, LTG_GETLNODE(key, siglen)) >= 0); + break; + case BTLessEqualStrategyNumber: + query = PG_GETARG_LTREE_P(1); + res = (ltree_compare((ltree *) query, LTG_GETLNODE(key, siglen)) >= 0); + break; + case BTEqualStrategyNumber: + query = PG_GETARG_LTREE_P(1); + if (GIST_LEAF(entry)) + res = (ltree_compare((ltree *) query, LTG_NODE(key)) == 0); + else + res = (ltree_compare((ltree *) query, LTG_GETLNODE(key, siglen)) >= 0 + && + ltree_compare((ltree *) query, LTG_GETRNODE(key, siglen)) <= 0); + break; + case BTGreaterEqualStrategyNumber: + query = PG_GETARG_LTREE_P(1); + res = (ltree_compare((ltree *) query, LTG_GETRNODE(key, siglen)) <= 0); + break; + case BTGreaterStrategyNumber: + query = PG_GETARG_LTREE_P(1); + res = (GIST_LEAF(entry)) ? + (ltree_compare((ltree *) query, LTG_GETRNODE(key, siglen)) < 0) + : + (ltree_compare((ltree *) query, LTG_GETRNODE(key, siglen)) <= 0); + break; + case 10: + query = PG_GETARG_LTREE_P_COPY(1); + res = (GIST_LEAF(entry)) ? + inner_isparent((ltree *) query, LTG_NODE(key)) + : + gist_isparent(key, (ltree *) query, siglen); + break; + case 11: + query = PG_GETARG_LTREE_P(1); + res = (GIST_LEAF(entry)) ? + inner_isparent(LTG_NODE(key), (ltree *) query) + : + gist_ischild(key, (ltree *) query, siglen); + break; + case 12: + case 13: + query = PG_GETARG_LQUERY_P(1); + if (GIST_LEAF(entry)) + res = DatumGetBool(DirectFunctionCall2(ltq_regex, + PointerGetDatum(LTG_NODE(key)), + PointerGetDatum((lquery *) query) + )); + else + res = (gist_qe(key, (lquery *) query, siglen) && + gist_between(key, (lquery *) query, siglen)); + break; + case 14: + case 15: + query = PG_GETARG_LTXTQUERY_P(1); + if (GIST_LEAF(entry)) + res = DatumGetBool(DirectFunctionCall2(ltxtq_exec, + PointerGetDatum(LTG_NODE(key)), + PointerGetDatum((ltxtquery *) query) + )); + else + res = gist_qtxt(key, (ltxtquery *) query, siglen); + break; + case 16: + case 17: + query = PG_GETARG_ARRAYTYPE_P(1); + if (GIST_LEAF(entry)) + res = DatumGetBool(DirectFunctionCall2(lt_q_regex, + PointerGetDatum(LTG_NODE(key)), + PointerGetDatum((ArrayType *) query) + )); + else + res = arrq_cons(key, (ArrayType *) query, siglen); + break; + default: + /* internal error */ + elog(ERROR, "unrecognized StrategyNumber: %d", strategy); + } + + PG_FREE_IF_COPY(query, 1); + PG_RETURN_BOOL(res); +} + +Datum +ltree_gist_options(PG_FUNCTION_ARGS) +{ + local_relopts *relopts = (local_relopts *) PG_GETARG_POINTER(0); + + init_local_reloptions(relopts, sizeof(LtreeGistOptions)); + add_local_int_reloption(relopts, "siglen", + "signature length in bytes", + LTREE_SIGLEN_DEFAULT, 1, LTREE_SIGLEN_MAX, + offsetof(LtreeGistOptions, siglen)); + + PG_RETURN_VOID(); +} |