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Create hooks to let a loadable plugin monitor (or even replace) the planner

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and/or create plans for hypothetical situations; in particular, investigate
plans that would be generated using hypothetical indexes.  This is a
heavily-rewritten version of the hooks proposed by Gurjeet Singh for his
Index Advisor project.  In this formulation, the index advisor can be
entirely a loadable module instead of requiring a significant part to be
in the core backend, and plans can be generated for hypothetical indexes
without requiring the creation and rolling-back of system catalog entries.

The index advisor patch as-submitted is not compatible with these hooks,
but it needs significant work anyway due to other 8.2-to-8.3 planner
changes.  With these hooks in the core backend, development of the advisor
can proceed as a pgfoundry project.
This commit is contained in:
Tom Lane
2007-05-25 17:54:25 +00:00
parent ce5b24abed
commit 604ffd280b
9 changed files with 168 additions and 62 deletions
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9
src/include/optimizer/plancat.h
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@@ -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/optimizer/plancat.h,v 1.43 2007/01/05 22:19:56 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/plancat.h,v 1.44 2007/05/25 17:54:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,6 +16,13 @@
#include "nodes/relation.h"
/* Hook for plugins to get control in get_relation_info() */
typedef void (*get_relation_info_hook_type) (PlannerInfo *root,
Oid relationObjectId,
bool inhparent,
RelOptInfo *rel);
extern DLLIMPORT get_relation_info_hook_type get_relation_info_hook;
extern void get_relation_info(PlannerInfo *root, Oid relationObjectId,
bool inhparent, RelOptInfo *rel);

11
src/include/optimizer/planner.h
View File

@@ -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/optimizer/planner.h,v 1.39 2007/04/16 01:14:58 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/planner.h,v 1.40 2007/05/25 17:54:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -18,8 +18,17 @@
#include "nodes/relation.h"
/* Hook for plugins to get control in planner() */
typedef PlannedStmt * (*planner_hook_type) (Query *parse,
int cursorOptions,
ParamListInfo boundParams);
extern DLLIMPORT planner_hook_type planner_hook;
extern PlannedStmt *planner(Query *parse, int cursorOptions,
ParamListInfo boundParams);
extern PlannedStmt *standard_planner(Query *parse, int cursorOptions,
ParamListInfo boundParams);
extern Plan *subquery_planner(PlannerGlobal *glob, Query *parse,
Index level, double tuple_fraction,
PlannerInfo **subroot);