diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2007-09-26 18:51:51 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2007-09-26 18:51:51 +0000 |
| commit | cdf0231c88bd65409f93904443ee4c021f021c64 (patch) | |
| tree | 972207b1e2775306cabffcf0fdaf8dc2ee81e789 /src/include/optimizer | |
| parent | 149af068ff5e468961c6f400b636b40f7dc3ab9f (diff) | |
Create a function variable "join_search_hook" to let plugins override the
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.
Diffstat (limited to 'src/include/optimizer')
| -rw-r--r-- | src/include/optimizer/paths.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/src/include/optimizer/paths.h b/src/include/optimizer/paths.h index 7199a545b29..cbde0c7b9a5 100644 --- a/src/include/optimizer/paths.h +++ b/src/include/optimizer/paths.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/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, |