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Adjust amrescan code so that it's allowed to call index_rescan with a

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NULL key pointer, indicating that the existing scan key should be reused.
This behavior isn't used yet but will be needed for my planned fix to
the keys_are_unique code.
This commit is contained in:
Tom Lane
2003-03-23 23:01:03 +00:00
parent cb1672e9f8
commit 0489783011
5 changed files with 63 additions and 72 deletions
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10
src/backend/access/index/indexam.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/index/indexam.c,v 1.64 2003/02/22 00:45:03 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/index/indexam.c,v 1.65 2003/03/23 23:01:03 tgl Exp $
*
* INTERFACE ROUTINES
* index_open - open an index relation by relation OID
@@ -294,8 +294,12 @@ index_beginscan(Relation heapRelation,
* index_rescan - (re)start a scan of an index
*
* The caller may specify a new set of scankeys (but the number of keys
* cannot change). Note that this is also called when first starting
* an indexscan; see RelationGetIndexScan.
* cannot change). To restart the scan without changing keys, pass NULL
* for the key array.
*
* Note that this is also called when first starting an indexscan;
* see RelationGetIndexScan. Keys *must* be passed in that case,
* unless scan->numberOfKeys is zero.
* ----------------
*/
void