From c2d301b388affcc59064b920f11f8779dae36c8f Mon Sep 17 00:00:00 2001
From: you06 <you1474600@gmail.com>
Date: Wed, 13 Jul 2022 14:05:43 +0800
Subject: [PATCH] add comment

Signed-off-by: you06 <you1474600@gmail.com>
---
 executor/point_get.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/executor/point_get.go b/executor/point_get.go
index 8baa02111241c..e744570cbf370 100644
--- a/executor/point_get.go
+++ b/executor/point_get.go
@@ -237,6 +237,7 @@ func (e *PointGetExecutor) Next(ctx context.Context, req *chunk.Chunk) error {
 				return err
 			}
 
+			// lockNonExistIdxKey indicates the key will be locked regardless of its existence.
 			lockNonExistIdxKey := !e.ctx.GetSessionVars().IsPessimisticReadConsistency()
 			// Non-exist keys are also locked if the isolation level is not read consistency,
 			// lock it before read here, then it's able to read from pessimistic lock cache.