diff options
Diffstat (limited to 'src/backend/optimizer/path/allpaths.c')
| -rw-r--r-- | src/backend/optimizer/path/allpaths.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c index b11b9399891..40129016260 100644 --- a/src/backend/optimizer/path/allpaths.c +++ b/src/backend/optimizer/path/allpaths.c @@ -1307,6 +1307,8 @@ add_paths_to_append_rel(PlannerInfo *root, RelOptInfo *rel, { List *subpaths = NIL; bool subpaths_valid = true; + List *startup_subpaths = NIL; + bool startup_subpaths_valid = true; List *partial_subpaths = NIL; List *pa_partial_subpaths = NIL; List *pa_nonpartial_subpaths = NIL; @@ -1346,6 +1348,20 @@ add_paths_to_append_rel(PlannerInfo *root, RelOptInfo *rel, else subpaths_valid = false; + /* + * When the planner is considering cheap startup plans, we'll also + * collect all the cheapest_startup_paths and build an AppendPath + * containing those as subpaths. + */ + if (rel->consider_startup && childrel->pathlist != NIL && + childrel->cheapest_startup_path->param_info == NULL) + accumulate_append_subpath(childrel->cheapest_startup_path, + &startup_subpaths, + NULL); + else + startup_subpaths_valid = false; + + /* Same idea, but for a partial plan. */ if (childrel->partial_pathlist != NIL) { @@ -1478,6 +1494,11 @@ add_paths_to_append_rel(PlannerInfo *root, RelOptInfo *rel, NIL, NULL, 0, false, -1)); + /* build an AppendPath for the cheap startup paths, if valid */ + if (startup_subpaths_valid) + add_path(rel, (Path *) create_append_path(root, rel, startup_subpaths, + NIL, NIL, NULL, 0, false, -1)); + /* * Consider an append of unordered, unparameterized partial paths. Make * it parallel-aware if possible. |