From b4937b96e97409d6d90eaffc02d6b8ab16a73fb3 Mon Sep 17 00:00:00 2001
From: Emmanuel Keller <emmanuel.keller@surrealdb.com>
Date: Fri, 30 Aug 2024 08:40:09 +0100
Subject: [PATCH] Avoid calling the storage engine when range scan is invalid
 (#4641)

---
 core/src/kvs/tikv/mod.rs | 2 +-
 core/src/kvs/tr.rs       | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/core/src/kvs/tikv/mod.rs b/core/src/kvs/tikv/mod.rs
index a4dbd5a7..913d52ee 100644
--- a/core/src/kvs/tikv/mod.rs
+++ b/core/src/kvs/tikv/mod.rs
@@ -394,7 +394,7 @@ impl super::api::Transaction for Transaction {
 	where
 		K: Into<Key> + Sprintable + Debug,
 	{
-		// TiKV does not support verisoned queries.
+		// TiKV does not support versioned queries.
 		if version.is_some() {
 			return Err(Error::UnsupportedVersionedQueries);
 		}
diff --git a/core/src/kvs/tr.rs b/core/src/kvs/tr.rs
index d9a1287d..ac03aa2d 100644
--- a/core/src/kvs/tr.rs
+++ b/core/src/kvs/tr.rs
@@ -352,6 +352,9 @@ impl Transactor {
 	{
 		let beg: Key = rng.start.into();
 		let end: Key = rng.end.into();
+		if beg > end {
+			return Ok(vec![]);
+		}
 		expand_inner!(&mut self.inner, v => { v.scan(beg..end, limit, version).await })
 	}