Datum
ginendscan(PG_FUNCTION_ARGS)
{
IndexScanDesc scan = (IndexScanDesc) PG_GETARG_POINTER(0);
GinScanOpaque so = (GinScanOpaque) scan->opaque;
if (so != NULL)
{
freeScanKeys(so->keys, so->nkeys, TRUE);
freeScanKeys(so->markPos, so->nkeys, FALSE);
MemoryContextDelete(so->tempCtx);
pfree(so);
}
PG_RETURN_VOID();
}
Datum
ginrestrpos(PG_FUNCTION_ARGS)
{
IndexScanDesc scan = (IndexScanDesc) PG_GETARG_POINTER(0);
GinScanOpaque so = (GinScanOpaque) scan->opaque;
freeScanKeys(so->keys, so->nkeys, FALSE);
so->keys = copyScanKeys(so->markPos, so->nkeys);
PG_RETURN_VOID();
}
Datum
ginendscan(PG_FUNCTION_ARGS)
{
IndexScanDesc scan = (IndexScanDesc) PG_GETARG_POINTER(0);
GinScanOpaque so = (GinScanOpaque) scan->opaque;
freeScanKeys(so);
MemoryContextDelete(so->tempCtx);
pfree(so);
PG_RETURN_VOID();
}
Datum
ginrescan(PG_FUNCTION_ARGS)
{
IndexScanDesc scan = (IndexScanDesc) PG_GETARG_POINTER(0);
ScanKey scankey = (ScanKey) PG_GETARG_POINTER(1);
GinScanOpaque so;
so = (GinScanOpaque) scan->opaque;
if (so == NULL)
{
/* if called from ginbeginscan */
so = (GinScanOpaque) palloc(sizeof(GinScanOpaqueData));
so->tempCtx = AllocSetContextCreate(CurrentMemoryContext,
"Gin scan temporary context",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
initGinState(&so->ginstate, scan->indexRelation);
scan->opaque = so;
}
else
{
freeScanKeys(so->keys, so->nkeys, TRUE);
freeScanKeys(so->markPos, so->nkeys, FALSE);
}
so->markPos = so->keys = NULL;
if (scankey && scan->numberOfKeys > 0)
{
memmove(scan->keyData, scankey,
scan->numberOfKeys * sizeof(ScanKeyData));
}
PG_RETURN_VOID();
}
Datum
ginrescan(PG_FUNCTION_ARGS)
{
IndexScanDesc scan = (IndexScanDesc) PG_GETARG_POINTER(0);
ScanKey scankey = (ScanKey) PG_GETARG_POINTER(1);
/* remaining arguments are ignored */
GinScanOpaque so = (GinScanOpaque) scan->opaque;
freeScanKeys(so);
if (scankey && scan->numberOfKeys > 0)
{
memmove(scan->keyData, scankey,
scan->numberOfKeys * sizeof(ScanKeyData));
}
PG_RETURN_VOID();
}
