/*
* hashrescan() -- rescan an index relation
*/
void
hashrescan(IndexScanDesc scan, ScanKey scankey, int nscankeys,
ScanKey orderbys, int norderbys)
{
HashScanOpaque so = (HashScanOpaque) scan->opaque;
Relation rel = scan->indexRelation;
/*
* Before leaving current page, deal with any killed items. Also, ensure
* that we acquire lock on current page before calling _hash_kill_items.
*/
if (so->numKilled > 0)
{
LockBuffer(so->hashso_curbuf, BUFFER_LOCK_SHARE);
_hash_kill_items(scan);
LockBuffer(so->hashso_curbuf, BUFFER_LOCK_UNLOCK);
}
_hash_dropscanbuf(rel, so);
/* set position invalid (this will cause _hash_first call) */
ItemPointerSetInvalid(&(so->hashso_curpos));
ItemPointerSetInvalid(&(so->hashso_heappos));
/* Update scan key, if a new one is given */
if (scankey && scan->numberOfKeys > 0)
{
memmove(scan->keyData,
scankey,
scan->numberOfKeys * sizeof(ScanKeyData));
}
so->hashso_buc_populated = false;
so->hashso_buc_split = false;
}
/*
* hashendscan() -- close down a scan
*/
void
hashendscan(IndexScanDesc scan)
{
HashScanOpaque so = (HashScanOpaque) scan->opaque;
Relation rel = scan->indexRelation;
/* Before leaving current page, deal with any killed items */
if (so->numKilled > 0)
_hash_kill_items(scan);
_hash_dropscanbuf(rel, so);
if (so->killedItems != NULL)
pfree(so->killedItems);
pfree(so);
scan->opaque = NULL;
}
/*
* hashendscan() -- close down a scan
*/
void
hashendscan(IndexScanDesc scan)
{
HashScanOpaque so = (HashScanOpaque) scan->opaque;
Relation rel = scan->indexRelation;
/*
* Before leaving current page, deal with any killed items. Also, ensure
* that we acquire lock on current page before calling _hash_kill_items.
*/
if (so->numKilled > 0)
{
LockBuffer(so->hashso_curbuf, BUFFER_LOCK_SHARE);
_hash_kill_items(scan);
LockBuffer(so->hashso_curbuf, BUFFER_LOCK_UNLOCK);
}
_hash_dropscanbuf(rel, so);
if (so->killedItems != NULL)
pfree(so->killedItems);
pfree(so);
scan->opaque = NULL;
}