From f4e4e7b8cd679a21d76bb137a53f1098e99191aa Mon Sep 17 00:00:00 2001
From: Richard Chien <stdrc@outlook.com>
Date: Thu, 1 Feb 2024 16:15:27 +0800
Subject: [PATCH] add comment

Signed-off-by: Richard Chien <stdrc@outlook.com>
---
 src/expr/core/src/window_function/state/buffer.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/expr/core/src/window_function/state/buffer.rs b/src/expr/core/src/window_function/state/buffer.rs
index c2402933e613e..ba064042c0021 100644
--- a/src/expr/core/src/window_function/state/buffer.rs
+++ b/src/expr/core/src/window_function/state/buffer.rs
@@ -336,6 +336,7 @@ impl<K: Ord, V: Clone> WindowImpl for RowsWindow<K, V> {
     }
 }
 
+/// The sliding window implementation for `RANGE` frames.
 pub(super) struct RangeWindow<V: Clone> {
     frame_bounds: RangeFrameBounds,
     _phantom: std::marker::PhantomData<V>,