/*
* Extract attribute (column) number of stored entry from GIN tuple
*/
OffsetNumber
gintuple_get_attrnum(GinState *ginstate, IndexTuple tuple)
{
OffsetNumber colN;
if (ginstate->oneCol)
{
/* column number is not stored explicitly */
colN = FirstOffsetNumber;
}
else
{
Datum res;
bool isnull;
/*
* First attribute is always int16, so we can safely use any tuple
* descriptor to obtain first attribute of tuple
*/
res = index_getattr(tuple, FirstOffsetNumber, ginstate->tupdesc[0],
&isnull);
Assert(!isnull);
colN = DatumGetUInt16(res);
Assert(colN >= FirstOffsetNumber && colN <= ginstate->origTupdesc->natts);
}
return colN;
}
static uint16
GetNewLabelId(char *graphname, Oid graphid)
{
char sname[128];
Datum stext;
uint16 labid;
int cnt;
snprintf(sname, 128, "%s.%s", graphname, AG_LABEL_SEQ);
stext = CStringGetTextDatum(sname);
cnt = 0;
for (;;)
{
Datum val;
val = DirectFunctionCall1(nextval, stext);
labid = DatumGetUInt16(val);
if (!labid_exists(graphid, labid))
break;
if (++cnt >= GRAPHID_LABID_MAX)
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("no more new labels are available")));
}
return labid;
}
Datum
gin_extract_tsquery(PG_FUNCTION_ARGS)
{
QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
uint32 *nentries = (uint32 *) PG_GETARG_POINTER(1);
StrategyNumber strategy = DatumGetUInt16(PG_GETARG_DATUM(2));
Datum *entries = NULL;
*nentries = 0;
if (query->size > 0)
{
int4 i,
j = 0,
len;
ITEM *item;
item = clean_NOT_v2(GETQUERY(query), &len);
if (!item)
elog(ERROR, "Query requires full scan, GIN doesn't support it");
item = GETQUERY(query);
for (i = 0; i < query->size; i++)
if (item[i].type == VAL)
(*nentries)++;
entries = (Datum *) palloc(sizeof(Datum) * (*nentries));
for (i = 0; i < query->size; i++)
if (item[i].type == VAL)
{
text *txt;
txt = (text *) palloc(VARHDRSZ + item[i].length);
VARATT_SIZEP(txt) = VARHDRSZ + item[i].length;
memcpy(VARDATA(txt), GETOPERAND(query) + item[i].distance, item[i].length);
entries[j++] = PointerGetDatum(txt);
if (strategy == 1 && item[i].weight != 0)
elog(ERROR, "With class of lexeme restrictions use @@@ operation");
}
}
PG_FREE_IF_COPY(query, 0);
PG_RETURN_POINTER(entries);
}