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Create a function variable "join_search_hook" to let plugins override the

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join search order portion of the planner; this is specifically intended to
simplify developing a replacement for GEQO planning.  Patch by Julius
Stroffek, editorialized on by me.  I renamed make_one_rel_by_joins to
standard_join_search and make_rels_by_joins to join_search_one_level to better
reflect their place within this scheme.
This commit is contained in:
Tom Lane
2007-09-26 18:51:51 +00:00
parent 149af068ff
commit cdf0231c88
4 changed files with 55 additions and 26 deletions
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14
src/include/optimizer/paths.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/paths.h,v 1.98 2007/05/22 01:40:33 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.99 2007/09/26 18:51:51 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -23,7 +23,16 @@
extern bool enable_geqo;
extern int geqo_threshold;
/* Hook for plugins to replace standard_join_search() */
typedef RelOptInfo * (*join_search_hook_type) (PlannerInfo *root,
int levels_needed,
List *initial_rels);
extern PGDLLIMPORT join_search_hook_type join_search_hook;
extern RelOptInfo *make_one_rel(PlannerInfo *root, List *joinlist);
extern RelOptInfo *standard_join_search(PlannerInfo *root, int levels_needed,
List *initial_rels);
#ifdef OPTIMIZER_DEBUG
extern void debug_print_rel(PlannerInfo *root, RelOptInfo *rel);
@@ -89,7 +98,8 @@ extern void add_paths_to_joinrel(PlannerInfo *root, RelOptInfo *joinrel,
* joinrels.c
* routines to determine which relations to join
*/
extern List *make_rels_by_joins(PlannerInfo *root, int level, List **joinrels);
extern List *join_search_one_level(PlannerInfo *root, int level,
List **joinrels);
extern RelOptInfo *make_join_rel(PlannerInfo *root,
RelOptInfo *rel1, RelOptInfo *rel2);
extern bool have_join_order_restriction(PlannerInfo *root,