In match_eclasses_to_foreign_key_col(), there is this:
if (em->em_is_child)
continue; /* ignore children here */
ISTM, it might as well be:
Assert(!em->em_is_child); /* no children yet */
That's because, I think it's still too early in query_planner() to be
expecting any child EC members.
Thanks,
Amit
diff --git a/src/backend/optimizer/path/equivclass.c b/src/backend/optimizer/path/equivclass.c
index 67bd760fb4..735bd7fdc6 100644
--- a/src/backend/optimizer/path/equivclass.c
+++ b/src/backend/optimizer/path/equivclass.c
@@ -2017,8 +2017,7 @@ match_eclasses_to_foreign_key_col(PlannerInfo *root,
EquivalenceMember *em = (EquivalenceMember *) lfirst(lc2);
Var *var;
- if (em->em_is_child)
- continue; /* ignore children here */
+ Assert(!em->em_is_child); /* no children yet */
/* EM must be a Var, possibly with RelabelType */
var = (Var *) em->em_expr;
--
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