diff --git a/src/kernel/lsm/table/ss_table/block.rs b/src/kernel/lsm/table/ss_table/block.rs
index fcb97be..10af548 100644
--- a/src/kernel/lsm/table/ss_table/block.rs
+++ b/src/kernel/lsm/table/ss_table/block.rs
@@ -642,7 +642,7 @@ where
 }
 
 /// 批量以restart_interval进行shared_len的获取
-fn sharding_shared_len<T>(vec_kv: &Vec<KeyValue<T>>, restart_interval: usize) -> Vec<usize>
+fn sharding_shared_len<T>(vec_kv: &[KeyValue<T>], restart_interval: usize) -> Vec<usize>
 where
     T: BlockItem,
 {
diff --git a/src/kernel/utils/bloom_filter.rs b/src/kernel/utils/bloom_filter.rs
index 432b3e0..eb0046b 100644
--- a/src/kernel/utils/bloom_filter.rs
+++ b/src/kernel/utils/bloom_filter.rs
@@ -41,7 +41,7 @@ impl<T: ?Sized> BloomFilter<T> {
         // g_i(x) = h1(x) + i * h2(x)
         let hashes = self.make_hash(elem);
         for fn_i in 0..self.hash_fn_count {
-            let index = self.get_index(hashes, fn_i as u64);
+            let index = self.get_index(hashes, fn_i);
             self.bits.set_bit(index, true);
         }
     }
@@ -52,7 +52,7 @@ impl<T: ?Sized> BloomFilter<T> {
     {
         let hashes = self.make_hash(elem);
         (0..self.hash_fn_count).all(|fn_i| {
-            let index = self.get_index(hashes, fn_i as u64);
+            let index = self.get_index(hashes, fn_i);
             self.bits.get_bit(index)
         })
     }
@@ -135,13 +135,17 @@ impl BitVector {
     }
 
     pub fn get_bit(&self, index: usize) -> bool {
-        (self.bit_groups[index / 8] >> index % 8) & 1 != 0
+        self.bit_groups[index / 8] >> index % 8 & 1 != 0
     }
 
     pub fn len(&self) -> usize {
         self.len as usize
     }
 
+    pub fn is_empty(&self) -> bool {
+        self.len == 0
+    }
+
     pub fn to_raw(&self) -> Vec<u8> {
         let mut bytes = u64::encode_fixed_vec(self.len);
 
@@ -269,7 +273,7 @@ mod tests {
                     false_positives += 1;
                 }
                 (false, true) => {
-                    assert!(false);
+                    unreachable!()
                 } // should never happen
                 _ => {}
             }