/*
* hashbeginscan() -- start a scan on a hash index
*/
Datum
hashbeginscan(PG_FUNCTION_ARGS)
{
Relation rel = (Relation) PG_GETARG_POINTER(0);
int nkeys = PG_GETARG_INT32(1);
int norderbys = PG_GETARG_INT32(2);
IndexScanDesc scan;
HashScanOpaque so;
/* no order by operators allowed */
Assert(norderbys == 0);
scan = RelationGetIndexScan(rel, nkeys, norderbys);
so = (HashScanOpaque) palloc(sizeof(HashScanOpaqueData));
so->hashso_bucket_valid = false;
so->hashso_bucket_blkno = 0;
so->hashso_curbuf = InvalidBuffer;
/* set position invalid (this will cause _hash_first call) */
ItemPointerSetInvalid(&(so->hashso_curpos));
ItemPointerSetInvalid(&(so->hashso_heappos));
scan->opaque = so;
/* register scan in case we change pages it's using */
_hash_regscan(scan);
PG_RETURN_POINTER(scan);
}
/*
* hashbeginscan() -- start a scan on a hash index
*/
IndexScanDesc
hashbeginscan(Relation rel, int nkeys, int norderbys)
{
IndexScanDesc scan;
HashScanOpaque so;
/* no order by operators allowed */
Assert(norderbys == 0);
scan = RelationGetIndexScan(rel, nkeys, norderbys);
so = (HashScanOpaque) palloc(sizeof(HashScanOpaqueData));
so->hashso_bucket_valid = false;
so->hashso_bucket_blkno = 0;
so->hashso_curbuf = InvalidBuffer;
/* set position invalid (this will cause _hash_first call) */
ItemPointerSetInvalid(&(so->hashso_curpos));
ItemPointerSetInvalid(&(so->hashso_heappos));
scan->opaque = so;
/* register scan in case we change pages it's using */
_hash_regscan(scan);
return scan;
}
/*
* hashbeginscan() -- start a scan on a hash index
*/
Datum
hashbeginscan(PG_FUNCTION_ARGS)
{
Relation rel = (Relation) PG_GETARG_POINTER(0);
int keysz = PG_GETARG_INT32(1);
ScanKey scankey = (ScanKey) PG_GETARG_POINTER(2);
IndexScanDesc scan;
HashScanOpaque so;
scan = RelationGetIndexScan(rel, keysz, scankey);
so = (HashScanOpaque) palloc(sizeof(HashScanOpaqueData));
so->hashso_bucket_valid = false;
so->hashso_bucket_blkno = 0;
so->hashso_curbuf = so->hashso_mrkbuf = InvalidBuffer;
scan->opaque = so;
/* register scan in case we change pages it's using */
_hash_regscan(scan);
PG_RETURN_POINTER(scan);
}
