diff --git a/src/datanode/src/region_server.rs b/src/datanode/src/region_server.rs
index 8e8f911a87e1..febe749bb734 100644
--- a/src/datanode/src/region_server.rs
+++ b/src/datanode/src/region_server.rs
@@ -206,7 +206,7 @@ impl RegionServer {
             .await
             .context(DecodeLogicalPlanSnafu)?;
 
-        let res = self
+        self
             .inner
             .handle_read(QueryRequest {
                 header: request.header,