diff --git a/src/common/base/src/bytes.rs b/src/common/base/src/bytes.rs
index 96f47588f1..1bbf5b296e 100644
--- a/src/common/base/src/bytes.rs
+++ b/src/common/base/src/bytes.rs
@@ -20,16 +20,6 @@ use serde::{Deserialize, Deserializer, Serialize, Serializer};
 #[derive(Debug, Default, Clone, PartialEq, Eq, PartialOrd, Ord, Deserialize, Serialize)]
 pub struct Bytes(bytes::Bytes);
 
-impl Bytes {
-    pub fn len(&self) -> usize {
-        self.0.len()
-    }
-
-    pub fn is_empty(&self) -> bool {
-        self.0.is_empty()
-    }
-}
-
 impl From<Bytes> for bytes::Bytes {
     fn from(value: Bytes) -> Self {
         value.0
diff --git a/src/sql/src/statements/statement_query.rs b/src/sql/src/statements/statement_query.rs
deleted file mode 100644
index b54d4df270..0000000000
--- a/src/sql/src/statements/statement_query.rs
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2023 Greptime Team
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-use sqlparser::ast::Query as SpQuery;
-
-use crate::errors::ParserError;
-
-/// Query statement instance.
-#[derive(Debug, Clone, PartialEq)]
-pub struct Query {
-    pub inner: SpQuery,
-}
-
-/// Automatically converts from sqlparser Query instance to SqlQuery.
-impl TryFrom<SpQuery> for Query {
-    type Error = ParserError;
-
-    fn try_from(q: SpQuery) -> Result<Self, Self::Error> {
-        Ok(Query { inner: q })
-    }
-}
-
-impl TryFrom<Query> for SpQuery {
-    type Error = ParserError;
-
-    fn try_from(value: Query) -> Result<Self, Self::Error> {
-        Ok(value.inner)
-    }
-}