diff options
Diffstat (limited to 'src/include/nodes/relation.h')
| -rw-r--r-- | src/include/nodes/relation.h | 25 |
1 files changed, 6 insertions, 19 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index 888005282aa..45cb17c52b8 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.184 2010/02/26 02:01:25 momjian Exp $ + * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.185 2010/03/28 22:59:33 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -240,7 +240,9 @@ typedef struct PlannerInfo * * We also have "other rels", which are like base rels in that they refer to * single RT indexes; but they are not part of the join tree, and are given - * a different RelOptKind to identify them. + * a different RelOptKind to identify them. Lastly, there is a RelOptKind + * for "dead" relations, which are base rels that we have proven we don't + * need to join after all. * * Currently the only kind of otherrels are those made for member relations * of an "append relation", that is an inheritance set or UNION ALL subquery. @@ -346,7 +348,8 @@ typedef enum RelOptKind { RELOPT_BASEREL, RELOPT_JOINREL, - RELOPT_OTHER_MEMBER_REL + RELOPT_OTHER_MEMBER_REL, + RELOPT_DEADREL } RelOptKind; typedef struct RelOptInfo @@ -802,22 +805,6 @@ typedef struct UniquePath } UniquePath; /* - * NoOpPath represents exactly the same plan as its subpath. This is used - * when we have determined that a join can be eliminated. The difference - * between the NoOpPath and its subpath is just that the NoOpPath's parent - * is the whole join relation while the subpath is for one of the joined - * relations (and the other one isn't needed). - * - * Note: path.pathtype is always T_Join, but this won't actually give rise - * to a Join plan node. - */ -typedef struct NoOpPath -{ - Path path; - Path *subpath; -} NoOpPath; - -/* * All join-type paths share these fields. */ |