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-rw-r--r--src/backend/optimizer/plan/createplan.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/backend/optimizer/plan/createplan.c b/src/backend/optimizer/plan/createplan.c
index 1b118528141..134130476e4 100644
--- a/src/backend/optimizer/plan/createplan.c
+++ b/src/backend/optimizer/plan/createplan.c
@@ -3017,6 +3017,9 @@ create_indexscan_plan(PlannerInfo *root,
/* it should be a base rel... */
Assert(baserelid > 0);
Assert(best_path->path.parent->rtekind == RTE_RELATION);
+ /* check the scan direction is valid */
+ Assert(best_path->indexscandir == ForwardScanDirection ||
+ best_path->indexscandir == BackwardScanDirection);
/*
* Extract the index qual expressions (stripped of RestrictInfos) from the