Datum
ghstore_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = entry;
if (entry->leafkey)
{
GISTTYPE *res = (GISTTYPE *) palloc0(CALCGTSIZE(0));
HStore *val = DatumGetHStoreP(entry->key);
HEntry *hsent = ARRPTR(val);
char *ptr = STRPTR(val);
int count = HS_COUNT(val);
int i;
SET_VARSIZE(res, CALCGTSIZE(0));
for (i = 0; i < count; ++i)
{
int h;
h = crc32_sz((char *) HSTORE_KEY(hsent, ptr, i),
HSTORE_KEYLEN(hsent, i));
HASH(GETSIGN(res), h);
if (!HSTORE_VALISNULL(hsent, i))
{
h = crc32_sz((char *) HSTORE_VAL(hsent, ptr, i),
HSTORE_VALLEN(hsent, i));
HASH(GETSIGN(res), h);
}
}
retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(res),
entry->rel, entry->page,
entry->offset,
FALSE);
}
else if (!ISALLTRUE(DatumGetPointer(entry->key)))
{
int32 i;
GISTTYPE *res;
BITVECP sign = GETSIGN(DatumGetPointer(entry->key));
LOOPBYTE
{
if ((sign[i] & 0xff) != 0xff)
PG_RETURN_POINTER(retval);
}
res = (GISTTYPE *) palloc(CALCGTSIZE(ALLISTRUE));
SET_VARSIZE(res, CALCGTSIZE(ALLISTRUE));
res->flag = ALLISTRUE;
retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(res),
entry->rel, entry->page,
entry->offset,
FALSE);
}
void setHstoreFromDatum(lua_State *L, Datum datum)
{
Lua_Hstore * strg;
BEGINLUA;
strg = (Lua_Hstore *)lua_newuserdata(L, sizeof(Lua_Hstore));
MTOLUA(L);
datum = datumCopy(datum, hs_type.byval, hs_type.len);
MTOPG;
strg->hstore = DatumGetHStoreP(datum);
strg->datum = datum;
strg->issync = 1;
strg->havetodel = 1;
lua_pushlightuserdata(L, strg);
lua_newtable(L);
lua_settable(L, LUA_REGISTRYINDEX);
luaP_getfield(L, hstore_type_name);
lua_setmetatable(L, -2);
ENDLUAV(1);
}