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;
}
}
}
}
Datum
_ltree_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = entry;
if (entry->leafkey)
{ /* ltree */
ltree_gist *key;
ArrayType *val = DatumGetArrayTypeP(entry->key);
int4 len = LTG_HDRSIZE + ASIGLEN;
int num = ArrayGetNItems(ARR_NDIM(val), ARR_DIMS(val));
ltree *item = (ltree *) ARR_DATA_PTR(val);
if (ARR_NDIM(val) != 1)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("array must be one-dimensional")));
key = (ltree_gist *) palloc(len);
key->len = len;
key->flag = 0;
MemSet(LTG_SIGN(key), 0, ASIGLEN);
while (num > 0)
{
hashing(LTG_SIGN(key), item);
num--;
item = NEXTVAL(item);
}
retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(key),
entry->rel, entry->page,
entry->offset, key->len, FALSE);
}
else if (!LTG_ISALLTRUE(entry->key))
{
int4 i,
len;
ltree_gist *key;
BITVECP sign = LTG_SIGN(DatumGetPointer(entry->key));
ALOOPBYTE(
if ((sign[i] & 0xff) != 0xff)
PG_RETURN_POINTER(retval);
);