Rework temp_tablespaces patch so that temp tablespaces are assigned separately

for each temp file, rather than once per sort or hashjoin; this allows
spreading the data of a large sort or join across multiple tablespaces.
(I remain dubious that this will make any difference in practice, but certain
people insisted.)  Arrange to cache the results of parsing the GUC variable
instead of recomputing from scratch on every demand, and push usage of the
cache down to the bottommost fd.c level.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/include/commands/tablespace.h b/src/include/commands/tablespace.h
index 78b86ffb68..f6f74c9fcb 100644
--- a/src/include/commands/tablespace.h
+++ b/src/include/commands/tablespace.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/commands/tablespace.h,v 1.17 2007/06/03 17:08:29 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/commands/tablespace.h,v 1.18 2007/06/07 19:19:57 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -41,7 +41,8 @@ extern void AlterTableSpaceOwner(const char *name, Oid newOwnerId);
 extern void TablespaceCreateDbspace(Oid spcNode, Oid dbNode, bool isRedo);
 
 extern Oid	GetDefaultTablespace(bool forTemp);
-extern Oid	GetTempTablespace(void);
+
+extern void PrepareTempTablespaces(void);
 
 extern Oid	get_tablespace_oid(const char *tablespacename);
 extern char *get_tablespace_name(Oid spc_oid);