Improve the following.

Hiroshi Inoue · Hiroshi Inoue · commit 3498ea830828 · 2000-08-30T08:48:55.000Z
=# create table t (id int4 unique);
NOTICE:  CREATE TABLE/UNIQUE will create implicit index 't_id_key' for table 't'
 =# begin;
 query: drop table t;
NOTICE:  Caution: DROP TABLE cannot be rolled back, so don't abort now
NOTICE:  Caution: DROP INDEX cannot be rolled back, so don't abort now
 =# rollback;
 =# drop table t;
NOTICE:  mdopen: couldn't open t: No such file or directory
NOTICE:  RelationIdBuildRelation: smgropen(t): No such file or directory
NOTICE:  mdopen: couldn't open t: No such file or directory
NOTICE:  mdopen: couldn't open t: No such file or directory
NOTICE:  mdopen: couldn't open t_id_key: No such file or directory
NOTICE:  RelationIdBuildRelation: smgropen(t_id_key): No such file or directory
NOTICE:  mdopen: couldn't open t: No such file or directory
NOTICE:  RelationIdBuildRelation: smgropen(t): No such file or directory
NOTICE:  mdopen: couldn't open t: No such file or directory
ERROR:  cannot open relation t
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.109 2000/08/06 04:39:03 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.110 2000/08/30 08:48:55 inoue Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1595,7 +1595,10 @@ RelationClearRelation(Relation relation, bool rebuildIt)
 		 * this is kind of expensive, but I think we must do it in case
 		 * relation has been truncated...
 		 */
-		relation->rd_nblocks = RelationGetNumberOfBlocks(relation);
+		if (relation->rd_unlinked)
+			relation->rd_nblocks = 0;
+		else
+			relation->rd_nblocks = RelationGetNumberOfBlocks(relation);
 
 		if (relDescChanged && !RelationHasReferenceCountZero(relation))
 			elog(ERROR, "RelationClearRelation: relation %u modified while in use",

Original file line number	Diff line number	Diff line change
`@@ -8,7 +8,7 @@`
`8`	`8`	`*`
`9`	`9`	`*`
`10`	`10`	`* IDENTIFICATION`
`11`		`- * $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.109 2000/08/06 04:39:03 tgl Exp $`
	`11`	`+ * $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.110 2000/08/30 08:48:55 inoue Exp $`
`12`	`12`	`*`
`13`	`13`	`*-------------------------------------------------------------------------`
`14`	`14`	`*/`
`@@ -1595,7 +1595,10 @@ RelationClearRelation(Relation relation, bool rebuildIt)`
`1595`	`1595`	`* this is kind of expensive, but I think we must do it in case`
`1596`	`1596`	`* relation has been truncated...`
`1597`	`1597`	`*/`
`1598`		`- relation->rd_nblocks = RelationGetNumberOfBlocks(relation);`
	`1598`	`+ if (relation->rd_unlinked)`
	`1599`	`+ relation->rd_nblocks = 0;`
	`1600`	`+ else`
	`1601`	`+ relation->rd_nblocks = RelationGetNumberOfBlocks(relation);`
`1599`	`1602`
`1600`	`1603`	`if (relDescChanged && !RelationHasReferenceCountZero(relation))`
`1601`	`1604`	`elog(ERROR, "RelationClearRelation: relation %u modified while in use",`