While working on adding support for tuple routing for foreign partitions, I noticed that in create_modifytable_path, we forgot to add a comment on its new argument 'partitioned_rels'. Attached a patch for including that in the comments for that function.

Best regards,
Etsuro Fujita
diff --git a/src/backend/optimizer/util/pathnode.c 
index ec4a093..46bc1df 100644
--- a/src/backend/optimizer/util/pathnode.c
+++ b/src/backend/optimizer/util/pathnode.c
@@ -3159,6 +3159,8 @@ create_lockrows_path(PlannerInfo *root, RelOptInfo *rel,
  * 'operation' is the operation type
  * 'canSetTag' is true if we set the command tag/es_processed
  * 'nominalRelation' is the parent RT index for use of EXPLAIN
+ * 'partitioned_rels' is an integer list of RT indexes of non-leaf tables in
+ *             the partition tree if UPDATE/DELETE to a partitioned table, 
else NIL
  * 'resultRelations' is an integer list of actual RT indexes of target rel(s)
  * 'subpaths' is a list of Path(s) producing source data (one per rel)
  * 'subroots' is a list of PlannerInfo structs (one per rel)
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