fix: add owned query frontend key conversion

Signed-off-by: jeremyhi <fengjiachun@gmail.com>

src/query-frontend/src/key.rs

@@ -73,6 +73,20 @@ impl From<&QueryFrontendRequest> for QueryKey {
     }
 }
 
+impl From<QueryFrontendRequest> for QueryKey {
+    fn from(request: QueryFrontendRequest) -> Self {
+        Self {
+            db: request.db,
+            read_preference: request.read_preference,
+            query: request.query,
+            start: request.start,
+            end: request.end,
+            step: request.step,
+            lookback: request.lookback,
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -163,6 +177,16 @@ mod tests {
         assert_eq!("db", request.key().db());
     }
 
+    #[test]
+    fn owned_request_converts_into_key() {
+        let request = test_request();
+        let borrowed_key = request.key();
+        let owned_key = request.into_key();
+
+        assert_eq!(borrowed_key, owned_key);
+        assert_eq!("db", owned_key.db());
+    }
+
     #[test]
     fn debug_redacts_query_text() {
         let request = QueryFrontendRequest {

src/query-frontend/src/request.rs

@@ -54,6 +54,11 @@ impl QueryFrontendRequest {
     pub fn key(&self) -> QueryKey {
         QueryKey::from(self)
     }
+
+    /// Converts this request into its exact identity [`QueryKey`].
+    pub fn into_key(self) -> QueryKey {
+        QueryKey::from(self)
+    }
 }
 
 impl fmt::Debug for QueryFrontendRequest {