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-rw-r--r--src/backend/optimizer/plan/setrefs.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/backend/optimizer/plan/setrefs.c b/src/backend/optimizer/plan/setrefs.c
index 493103a1dbd..1c0d70b5b3e 100644
--- a/src/backend/optimizer/plan/setrefs.c
+++ b/src/backend/optimizer/plan/setrefs.c
@@ -1082,6 +1082,10 @@ set_join_references(PlannerInfo *root, Join *join, int rtoffset)
outer_itlist,
OUTER_VAR,
rtoffset);
+ /* Check we replaced any PlaceHolderVar with simple Var */
+ if (!(IsA(nlp->paramval, Var) &&
+ nlp->paramval->varno == OUTER_VAR))
+ elog(ERROR, "NestLoopParam was not reduced to a simple Var");
}
}
else if (IsA(join, MergeJoin))