diff --git a/src/scope.rs b/src/scope.rs
index 0f1baf02..3550ee83 100644
--- a/src/scope.rs
+++ b/src/scope.rs
@@ -32,15 +32,12 @@ impl<K> Scope<K>
 where
     K: Ord,
 {
-    pub(crate) fn is_between(&self, key: &K) -> bool {
-        self.min.le(key) && self.max.ge(key)
+    pub(crate) fn contains(&self, key: &K) -> bool {
+        &self.min <= key && key <= &self.max
     }
 
-    pub(crate) fn is_meet(&self, target: &Scope<K>) -> bool {
-        (self.min.le(&target.min) && self.max.ge(&target.min))
-            || (self.min.le(&target.max) && self.max.ge(&target.max))
-            || (self.min.le(&target.min)) && self.max.ge(&target.max)
-            || (self.min.ge(&target.min)) && self.max.le(&target.max)
+    pub(crate) fn overlapped(&self, target: &Self) -> bool {
+        self.contains(&target.min) || self.contains(&target.max)
     }
 }
 
diff --git a/src/version/mod.rs b/src/version/mod.rs
index 0ce60eac..3e045679 100644
--- a/src/version/mod.rs
+++ b/src/version/mod.rs
@@ -68,7 +68,7 @@ where
         key: &TimestampedRef<R::Key>,
     ) -> Result<Option<RecordBatchEntry<R>>, VersionError<R>> {
         for scope in self.level_slice[0].iter().rev() {
-            if !scope.is_between(key.value()) {
+            if !scope.contains(key.value()) {
                 continue;
             }
             if let Some(entry) = Self::table_query(self, key, &scope.gen).await? {
@@ -80,7 +80,7 @@ where
                 continue;
             }
             let index = Self::scope_search(key.value(), level);
-            if !level[index].is_between(key.value()) {
+            if !level[index].contains(key.value()) {
                 continue;
             }
             if let Some(entry) = Self::table_query(self, key, &level[index].gen).await? {