Skip ambulkdelete scan if there's nothing to delete and the index is not

[postgresql] / src / backend / access / index / indexam.c

diff --git a/src/backend/access/index/indexam.c b/src/backend/access/index/indexam.c
index 6a681192cafbb0cdca6fd18cf8afc8aa2707546e..69c9ecb918987e9b7d8863b5fe2d4385cc8a8aa2 100644 (file)
--- a/src/backend/access/index/indexam.c
+++ b/src/backend/access/index/indexam.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/access/index/indexam.c,v 1.89 2006/02/11 17:14:08 momjian Exp $
+ *       $PostgreSQL: pgsql/src/backend/access/index/indexam.c,v 1.90 2006/02/11 23:31:33 tgl Exp $
  *
  * INTERFACE ROUTINES
  *             index_open              - open an index relation by relation OID
@@ -685,6 +685,10 @@ index_getmulti(IndexScanDesc scan,
  *             callback routine tells whether a given main-heap tuple is
  *             to be deleted
  *
+ *             if callback_state is NULL then there are no tuples to be deleted;
+ *             index AM can choose to avoid work in this case, but must still
+ *             follow the protocol of returning statistical info.
+ * 
  *             return value is an optional palloc'd struct of statistics
  * ----------------
  */