From 52cb3dc3b4b9f78d87b869cd1b1f50ea1ab00a08 Mon Sep 17 00:00:00 2001
From: tpp <146148086+terry1purcell@users.noreply.github.com>
Date: Tue, 18 Nov 2025 03:29:35 -0800
Subject: [PATCH] planner: bug fix for compareCandidates (#64525)

ref pingcap/tidb#64378
---
 pkg/planner/core/find_best_task.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkg/planner/core/find_best_task.go b/pkg/planner/core/find_best_task.go
index db5575dd4b..ea8564e325 100644
--- a/pkg/planner/core/find_best_task.go
+++ b/pkg/planner/core/find_best_task.go
@@ -918,7 +918,7 @@ func compareCandidates(sctx base.PlanContext, statsTbl *statistics.Table, prop *
 		if riskResult > 0 && leftDidNotLose && totalSum >= 0 && predicateResult > 1 {
 			return 1, lhsPseudo // left wins - also return whether it has statistics (pseudo) or not
 		}
-		if riskResult < 0 && rightDidNotLose && totalSum <= 0 && predicateResult < 1 {
+		if riskResult < 0 && rightDidNotLose && totalSum <= 0 && predicateResult < -1 {
 			return -1, rhsPseudo // right wins - also return whether it has statistics (pseudo) or not
 		}
 		return 0, false // No winner (0). Do not return the pseudo result