greenplumn ltree_gist 源码
greenplumn ltree_gist 代码
文件路径：/contrib/ltree/ltree_gist.c
/*
* GiST support for ltree
* Teodor Sigaev <teodor@stack.net>
* contrib/ltree/ltree_gist.c
*/
#include "postgres.h"
#include "access/gist.h"
#include "access/stratnum.h"
#include "crc32.h"
#include "ltree.h"
#define NEXTVAL(x) ( (lquery*)( (char*)(x) + INTALIGN( VARSIZE(x) ) ) )
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);
}
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);
#define ISEQ(a,b) ( (a)->numlevel == (b)->numlevel && ltree_compare(a,b)==0 )
#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_gist *key;
ltree *val = DatumGetLtreeP(entry->key);
int32 len = LTG_HDRSIZE + VARSIZE(val);
key = (ltree_gist *) palloc0(len);
SET_VARSIZE(key, len);
key->flag = LTG_ONENODE;
memcpy((void *) LTG_NODE(key), (void *) val, VARSIZE(val));
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);
*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), LTG_LNODE(b)))
PG_RETURN_POINTER(result);
if (!ISEQ(LTG_RNODE(a), LTG_RNODE(b)))
PG_RETURN_POINTER(result);
*result = true;
if (!LTG_ISALLTRUE(a))
{
LOOPBYTE
{
if (sa[i] != sb[i])
{
*result = false;
break;
}
}
}
}
PG_RETURN_POINTER(result);
}
static void
hashing(BITVECP sign, ltree *t)
{
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);
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);
BITVEC base;
int32 i,
j;
ltree_gist *result,
*cur;
ltree *left = NULL,
*right = NULL,
*curtree;
bool isalltrue = false;
bool isleqr;
MemSet((void *) base, 0, sizeof(BITVEC));
for (j = 0; j < entryvec->n; j++)
{
cur = GETENTRY(entryvec, j);
if (LTG_ISONENODE(cur))
{
curtree = LTG_NODE(cur);
hashing(base, curtree);
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
((unsigned char *) base)[i] |= sc[i];
}
curtree = LTG_LNODE(cur);
if (!left || ltree_compare(left, curtree) > 0)
left = curtree;
curtree = LTG_RNODE(cur);
if (!right || ltree_compare(right, curtree) < 0)
right = curtree;
}
}
if (isalltrue == false)
{
isalltrue = true;
LOOPBYTE
{
if (((unsigned char *) base)[i] != 0xff)
{
isalltrue = false;
break;
}
}
}
isleqr = (left == right || ISEQ(left, right)) ? true : false;
*size = LTG_HDRSIZE + ((isalltrue) ? 0 : SIGLEN) + VARSIZE(left) + ((isleqr) ? 0 : VARSIZE(right));
result = (ltree_gist *) palloc0(*size);
SET_VARSIZE(result, *size);
result->flag = 0;
if (isalltrue)
result->flag |= LTG_ALLTRUE;
else
memcpy((void *) LTG_SIGN(result), base, SIGLEN);
memcpy((void *) LTG_LNODE(result), (void *) left, VARSIZE(left));
if (isleqr)
result->flag |= LTG_NORIGHT;
else
memcpy((void *) LTG_RNODE(result), (void *) right, VARSIZE(right));
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);
int32 cmpr,
cmpl;
cmpl = ltree_compare(LTG_GETLNODE(origval), LTG_GETLNODE(newval));
cmpr = ltree_compare(LTG_GETRNODE(newval), LTG_GETRNODE(origval));
*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);
OffsetNumber j;
int32 i;
RIX *array;
OffsetNumber maxoff;
int nbytes;
int size;
ltree *lu_l,
*lu_r,
*ru_l,
*ru_r;
ltree_gist *lu,
*ru;
BITVEC ls,
rs;
bool lisat = false,
risat = false,
isleqr;
memset((void *) ls, 0, sizeof(BITVEC));
memset((void *) rs, 0, sizeof(BITVEC));
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);
}
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), lu_r) > 0)
lu_r = LTG_GETRNODE(lu);
if (LTG_ISONENODE(lu))
hashing(ls, LTG_NODE(lu));
else
{
if (lisat || LTG_ISALLTRUE(lu))
lisat = true;
else
{
BITVECP sc = LTG_SIGN(lu);
LOOPBYTE
((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), ru_r) > 0)
ru_r = LTG_GETRNODE(lu);
if (LTG_ISONENODE(lu))
hashing(rs, LTG_NODE(lu));
else
{
if (risat || LTG_ISALLTRUE(lu))
risat = true;
else
{
BITVECP sc = LTG_SIGN(lu);
LOOPBYTE
((unsigned char *) rs)[i] |= sc[i];
}
}
}
}
if (lisat == false)
{
lisat = true;
LOOPBYTE
{
if (((unsigned char *) ls)[i] != 0xff)
{
lisat = false;
break;
}
}
}
if (risat == false)
{
risat = true;
LOOPBYTE
{
if (((unsigned char *) rs)[i] != 0xff)
{
risat = false;
break;
}
}
}
lu_l = LTG_GETLNODE(GETENTRY(entryvec, array[FirstOffsetNumber].index));
isleqr = (lu_l == lu_r || ISEQ(lu_l, lu_r)) ? true : false;
size = LTG_HDRSIZE + ((lisat) ? 0 : SIGLEN) + VARSIZE(lu_l) + ((isleqr) ? 0 : VARSIZE(lu_r));
lu = (ltree_gist *) palloc0(size);
SET_VARSIZE(lu, size);
lu->flag = 0;
if (lisat)
lu->flag |= LTG_ALLTRUE;
else
memcpy((void *) LTG_SIGN(lu), ls, SIGLEN);
memcpy((void *) LTG_LNODE(lu), (void *) lu_l, VARSIZE(lu_l));
if (isleqr)
lu->flag |= LTG_NORIGHT;
else
memcpy((void *) LTG_RNODE(lu), (void *) lu_r, VARSIZE(lu_r));
ru_l = LTG_GETLNODE(GETENTRY(entryvec, array[1 + ((maxoff - FirstOffsetNumber + 1) / 2)].index));
isleqr = (ru_l == ru_r || ISEQ(ru_l, ru_r)) ? true : false;
size = LTG_HDRSIZE + ((risat) ? 0 : SIGLEN) + VARSIZE(ru_l) + ((isleqr) ? 0 : VARSIZE(ru_r));
ru = (ltree_gist *) palloc0(size);
SET_VARSIZE(ru, size);
ru->flag = 0;
if (risat)
ru->flag |= LTG_ALLTRUE;
else
memcpy((void *) LTG_SIGN(ru), rs, SIGLEN);
memcpy((void *) LTG_LNODE(ru), (void *) ru_l, VARSIZE(ru_l));
if (isleqr)
ru->flag |= LTG_NORIGHT;
else
memcpy((void *) LTG_RNODE(ru), (void *) ru_r, VARSIZE(ru_r));
v->spl_ldatum = PointerGetDatum(lu);
v->spl_rdatum = PointerGetDatum(ru);
PG_RETURN_POINTER(v);
}
static bool
gist_isparent(ltree_gist *key, ltree *query)
{
int32 numlevel = query->numlevel;
int i;
for (i = query->numlevel; i >= 0; i--)
{
query->numlevel = i;
if (ltree_compare(query, LTG_GETLNODE(key)) >= 0 && ltree_compare(query, LTG_GETRNODE(key)) <= 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)
{
ltree *left = copy_ltree(LTG_GETLNODE(key));
ltree *right = copy_ltree(LTG_GETRNODE(key));
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)
{
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)))
{
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)
{
if (query->firstgood == 0)
return true;
if (gist_tqcmp(LTG_GETLNODE(key), query) > 0)
return false;
if (gist_tqcmp(LTG_GETRNODE(key), query) < 0)
return false;
return true;
}
static bool
checkcondition_bit(void *checkval, ITEM *val)
{
return (FLG_CANLOOKSIGN(val->flag)) ? GETBIT(checkval, HASHVAL(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
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 (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) && gist_between(key, query))
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);
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)) >= 0);
break;
case BTLessEqualStrategyNumber:
query = PG_GETARG_LTREE_P(1);
res = (ltree_compare((ltree *) query, LTG_GETLNODE(key)) >= 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)) >= 0
&&
ltree_compare((ltree *) query, LTG_GETRNODE(key)) <= 0
);
break;
case BTGreaterEqualStrategyNumber:
query = PG_GETARG_LTREE_P(1);
res = (ltree_compare((ltree *) query, LTG_GETRNODE(key)) <= 0);
break;
case BTGreaterStrategyNumber:
query = PG_GETARG_LTREE_P(1);
res = (GIST_LEAF(entry)) ?
(ltree_compare((ltree *) query, LTG_GETRNODE(key)) < 0)
:
(ltree_compare((ltree *) query, LTG_GETRNODE(key)) <= 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);
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);
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) && gist_between(key, (lquery *) query));
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);
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);
break;
default:
/* internal error */
elog(ERROR, "unrecognized StrategyNumber: %d", strategy);
}
PG_FREE_IF_COPY(query, 1);
PG_RETURN_BOOL(res);
}
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