diff options
| author | Tom Lane | 2010-07-12 17:01:06 +0000 |
|---|---|---|
| committer | Tom Lane | 2010-07-12 17:01:06 +0000 |
| commit | 53e757689ce94520f1c53a89dbaa14ea57b09da7 (patch) | |
| tree | afa68ba05699223a719104b953bc20f37d4c33d1 /src/include/optimizer | |
| parent | 5a3489357fb61f1ea76412ada33549aca152ad55 (diff) | |
Make NestLoop plan nodes pass outer-relation variables into their inner
relation using the general PARAM_EXEC executor parameter mechanism, rather
than the ad-hoc kluge of passing the outer tuple down through ExecReScan.
The previous method was hard to understand and could never be extended to
handle parameters coming from multiple join levels. This patch doesn't
change the set of possible plans nor have any significant performance effect,
but it's necessary infrastructure for future generalization of the concept
of an inner indexscan plan.
ExecReScan's second parameter is now unused, so it's removed.
Diffstat (limited to 'src/include/optimizer')
| -rw-r--r-- | src/include/optimizer/subselect.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/optimizer/subselect.h b/src/include/optimizer/subselect.h index 1bc52cc14c..abbbd58c24 100644 --- a/src/include/optimizer/subselect.h +++ b/src/include/optimizer/subselect.h @@ -5,7 +5,7 @@ * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.39 2010/01/02 16:58:07 momjian Exp $ + * $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.40 2010/07/12 17:01:06 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -29,6 +29,7 @@ extern void SS_finalize_plan(PlannerInfo *root, Plan *plan, bool attach_initplans); extern Param *SS_make_initplan_from_plan(PlannerInfo *root, Plan *plan, Oid resulttype, int32 resulttypmod); +extern Param *assign_nestloop_param(PlannerInfo *root, Var *var); extern int SS_assign_special_param(PlannerInfo *root); #endif /* SUBSELECT_H */ |