/*
* index_beginscan - start a scan of an index with amgettuple
*
* Caller must be holding suitable locks on the heap and the index.
*/
IndexScanDesc
index_beginscan(Relation heapRelation,
Relation indexRelation,
Snapshot snapshot,
int nkeys, ScanKey key)
{
MIRROREDLOCK_BUFMGR_VERIFY_NO_LOCK_LEAK_DECLARE;
IndexScanDesc scan;
MIRROREDLOCK_BUFMGR_VERIFY_NO_LOCK_LEAK_ENTER;
scan = index_beginscan_internal(indexRelation, nkeys, key);
/*
* Save additional parameters into the scandesc. Everything else was set
* up by RelationGetIndexScan.
*/
scan->heapRelation = heapRelation;
scan->xs_snapshot = snapshot;
MIRROREDLOCK_BUFMGR_VERIFY_NO_LOCK_LEAK_EXIT;
return scan;
}
/*
* index_beginscan_bitmap - start a scan of an index with amgetbitmap
*
* As above, caller had better be holding some lock on the parent heap
* relation, even though it's not explicitly mentioned here.
*/
IndexScanDesc
index_beginscan_bitmap(Relation indexRelation,
Snapshot snapshot,
int nkeys)
{
IndexScanDesc scan;
scan = index_beginscan_internal(indexRelation, nkeys, 0, snapshot);
/*
* Save additional parameters into the scandesc. Everything else was set
* up by RelationGetIndexScan.
*/
scan->xs_snapshot = snapshot;
return scan;
}
/*
* index_beginscan - start a scan of an index with amgettuple
*
* Caller must be holding suitable locks on the heap and the index.
*/
IndexScanDesc
index_beginscan(Relation heapRelation,
Relation indexRelation,
Snapshot snapshot,
int nkeys, int norderbys)
{
IndexScanDesc scan;
scan = index_beginscan_internal(indexRelation, nkeys, norderbys, snapshot, NULL, false);
/*
* Save additional parameters into the scandesc. Everything else was set
* up by RelationGetIndexScan.
*/
scan->heapRelation = heapRelation;
scan->xs_snapshot = snapshot;
return scan;
}
/*
* index_beginscan_parallel - join parallel index scan
*
* Caller must be holding suitable locks on the heap and the index.
*/
IndexScanDesc
index_beginscan_parallel(Relation heaprel, Relation indexrel, int nkeys,
int norderbys, ParallelIndexScanDesc pscan)
{
Snapshot snapshot;
IndexScanDesc scan;
Assert(RelationGetRelid(heaprel) == pscan->ps_relid);
snapshot = RestoreSnapshot(pscan->ps_snapshot_data);
RegisterSnapshot(snapshot);
scan = index_beginscan_internal(indexrel, nkeys, norderbys, snapshot,
pscan, true);
/*
* Save additional parameters into the scandesc. Everything else was set
* up by index_beginscan_internal.
*/
scan->heapRelation = heaprel;
scan->xs_snapshot = snapshot;
return scan;
}
