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Redefine create_upper_paths_hook as being invoked once per upper relation.

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Per discussion, this gives potential users of the hook more flexibility,
because they can build custom Paths that implement only one stage of
upper processing atop core-provided Paths for earlier stages.
This commit is contained in:
Tom Lane
2016-04-12 15:23:14 -04:00
parent 7a5f8b5c59
commit f1f01de145
3 changed files with 45 additions and 13 deletions
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7
src/backend/optimizer/prep/prepunion.c
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@@ -206,7 +206,12 @@ plan_set_operations(PlannerInfo *root)
/* Add only the final path to the SETOP upperrel. */
add_path(setop_rel, path);
/* Select cheapest path (pretty easy at the moment) */
/* Let extensions possibly add some more paths */
if (create_upper_paths_hook)
(*create_upper_paths_hook) (root, UPPERREL_SETOP,
NULL, setop_rel);
/* Select cheapest path */
set_cheapest(setop_rel);
return setop_rel;