diff options
Diffstat (limited to 'src/backend/optimizer/util/pathnode.c')
| -rw-r--r-- | src/backend/optimizer/util/pathnode.c | 39 |
1 files changed, 16 insertions, 23 deletions
diff --git a/src/backend/optimizer/util/pathnode.c b/src/backend/optimizer/util/pathnode.c index f8270074142..c0363d2405d 100644 --- a/src/backend/optimizer/util/pathnode.c +++ b/src/backend/optimizer/util/pathnode.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/optimizer/util/pathnode.c,v 1.128 2006/06/06 17:59:57 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/util/pathnode.c,v 1.129 2006/07/01 18:38:33 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -667,36 +667,29 @@ create_append_path(RelOptInfo *rel, List *subpaths) /* * create_result_path - * Creates a path corresponding to a Result plan, returning the - * pathnode. + * Creates a path representing a Result-and-nothing-else plan. + * This is only used for the case of a query with an empty jointree. */ ResultPath * -create_result_path(RelOptInfo *rel, Path *subpath, List *constantqual) +create_result_path(List *quals) { ResultPath *pathnode = makeNode(ResultPath); pathnode->path.pathtype = T_Result; - pathnode->path.parent = rel; /* may be NULL */ - - if (subpath) - pathnode->path.pathkeys = subpath->pathkeys; - else - pathnode->path.pathkeys = NIL; - - pathnode->subpath = subpath; - pathnode->constantqual = constantqual; + pathnode->path.parent = NULL; + pathnode->path.pathkeys = NIL; + pathnode->quals = quals; /* Ideally should define cost_result(), but I'm too lazy */ - if (subpath) - { - pathnode->path.startup_cost = subpath->startup_cost; - pathnode->path.total_cost = subpath->total_cost; - } - else - { - pathnode->path.startup_cost = 0; - pathnode->path.total_cost = cpu_tuple_cost; - } + pathnode->path.startup_cost = 0; + pathnode->path.total_cost = cpu_tuple_cost; + /* + * In theory we should include the qual eval cost as well, but + * at present that doesn't accomplish much except duplicate work that + * will be done again in make_result; since this is only used for + * degenerate cases, nothing interesting will be done with the path + * cost values... + */ return pathnode; } |