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First phase of plan-invalidation project: create a plan cache management

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module and teach PREPARE and protocol-level prepared statements to use it.
In service of this, rearrange utility-statement processing so that parse
analysis does not assume table schemas can't change before execution for
utility statements (necessary because we don't attempt to re-acquire locks
for utility statements when reusing a stored plan).  This requires some
refactoring of the ProcessUtility API, but it ends up cleaner anyway,
for instance we can get rid of the QueryContext global.

Still to do: fix up SPI and related code to use the plan cache; I'm tempted to
try to make SQL functions use it too.  Also, there are at least some aspects
of system state that we want to ensure remain the same during a replan as in
the original processing; search_path certainly ought to behave that way for
instance, and perhaps there are others.
This commit is contained in:
Tom Lane
2007-03-13 00:33:44 +00:00
parent f84308f195
commit b9527e9840
61 changed files with 2478 additions and 1354 deletions
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5
src/include/utils/memutils.h
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@ -10,7 +10,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/memutils.h,v 1.61 2007/01/05 22:19:59 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/memutils.h,v 1.62 2007/03/13 00:33:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -75,8 +75,7 @@ extern DLLIMPORT MemoryContext MessageContext;
extern DLLIMPORT MemoryContext TopTransactionContext;
extern DLLIMPORT MemoryContext CurTransactionContext;
/* These two are transient links to contexts owned by other objects: */
extern DLLIMPORT MemoryContext QueryContext;
/* This is a transient link to the active portal's memory context: */
extern DLLIMPORT MemoryContext PortalContext;