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Allow callers of create_foreignscan_path to specify nondefault PathTarget.

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Although the default choice of rel->reltarget should typically be
sufficient for scan or join paths, it's not at all sufficient for the
purposes PathTargets were invented for; in particular not for
upper-relation Paths.  So break API compatibility by adding a PathTarget
argument to create_foreignscan_path().  To ease updating of existing
code, accept a NULL value of the argument as selecting rel->reltarget.
This commit is contained in:
Tom Lane
2016-03-14 17:31:28 -04:00
parent 307c78852f
commit 28048cbaa2
4 changed files with 11 additions and 2 deletions
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src/include/optimizer/pathnode.h
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@@ -87,6 +87,7 @@ extern Path *create_ctescan_path(PlannerInfo *root, RelOptInfo *rel,
extern Path *create_worktablescan_path(PlannerInfo *root, RelOptInfo *rel,
Relids required_outer);
extern ForeignPath *create_foreignscan_path(PlannerInfo *root, RelOptInfo *rel,
PathTarget *target,
double rows, Cost startup_cost, Cost total_cost,
List *pathkeys,
Relids required_outer,