Datum
querytree(PG_FUNCTION_ARGS)
{
QUERYTYPE *query = (QUERYTYPE *) PG_GETARG_QUERYTYPE_P_COPY(0);
INFIX nrm;
text *res;
ITEM *q;
int4 len;
if (query->size == 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("empty query")));
q = (ITEM *) palloc(sizeof(ITEM) * query->size);
memcpy((void *) q, GETQUERY(query), sizeof(ITEM) * query->size);
len = shorterquery(q, query->size);
PG_FREE_IF_COPY(query, 0);
if (len == 0)
{
res = (text *) palloc(1 + VARHDRSZ);
SET_VARSIZE(res, 1 + VARHDRSZ);
*((char *) VARDATA(res)) = 'T';
}
else
{
nrm.curpol = q + len - 1;
nrm.buflen = 32;
nrm.cur = nrm.buf = (char *) palloc(sizeof(char) * nrm.buflen);
*(nrm.cur) = '\0';
infix(&nrm, true);
res = (text *) palloc(nrm.cur - nrm.buf + VARHDRSZ);
SET_VARSIZE(res, nrm.cur - nrm.buf + VARHDRSZ);
memcpy(VARDATA(res), nrm.buf, nrm.cur - nrm.buf);
}
pfree(q);
PG_RETURN_POINTER(res);
}
Datum
querytree(PG_FUNCTION_ARGS)
{
QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_POINTER(0));
INFIX nrm;
text *res;
ITEM *q;
int4 len;
if (query->size == 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("empty query")));
q = (ITEM *) palloc(sizeof(ITEM) * query->size);
memcpy((void *) q, GETQUERY(query), sizeof(ITEM) * query->size);
len = shorterquery(q, query->size);
PG_FREE_IF_COPY(query, 0);
if (len == 0)
{
res = cstring_to_text("T");
}
else
{
nrm.curpol = q + len - 1;
nrm.buflen = 32;
nrm.cur = nrm.buf = (char *) palloc(sizeof(char) * nrm.buflen);
*(nrm.cur) = '\0';
infix(&nrm, true);
res = cstring_to_text_with_len(nrm.buf, nrm.cur - nrm.buf);
}
pfree(q);
PG_RETURN_TEXT_P(res);
}
Datum
ginint4_queryextract(PG_FUNCTION_ARGS)
{
int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
StrategyNumber strategy = PG_GETARG_UINT16(2);
Datum *res = NULL;
*nentries = 0;
if (strategy == BooleanSearchStrategy)
{
QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM_COPY(PG_GETARG_POINTER(0));
ITEM *items = GETQUERY(query);
int i;
if (query->size == 0)
PG_RETURN_POINTER(NULL);
if (shorterquery(items, query->size) == 0)
elog(ERROR, "Query requires full scan, GIN doesn't support it");
pfree(query);
query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_POINTER(0));
items = GETQUERY(query);
res = (Datum *) palloc(sizeof(Datum) * query->size);
*nentries = 0;
for (i = 0; i < query->size; i++)
if (items[i].type == VAL)
{
res[*nentries] = Int32GetDatum(items[i].val);
(*nentries)++;
}
}
else
{
ArrayType *query = PG_GETARG_ARRAYTYPE_P(0);
int4 *arr;
uint32 i;
CHECKARRVALID(query);
*nentries = ARRNELEMS(query);
if (*nentries > 0)
{
res = (Datum *) palloc(sizeof(Datum) * (*nentries));
arr = ARRPTR(query);
for (i = 0; i < *nentries; i++)
res[i] = Int32GetDatum(arr[i]);
}
}
if (*nentries == 0)
{
switch (strategy)
{
case BooleanSearchStrategy:
case RTOverlapStrategyNumber:
*nentries = -1; /* nobody can be found */
break;
default: /* require fullscan: GIN can't find void
* arrays */
break;
}
}
PG_RETURN_POINTER(res);
}
