feat(router): add a flag to disable the caching for query plans

Author: ardatan

bin/router/src/pipeline/query_plan.rs

@@ -21,9 +21,19 @@ pub async fn plan_operation_with_cache(
         StableOverrideContext::new(&app_state.planner.supergraph, request_override_context);
 
     let filtered_operation_for_plan = &normalized_operation.operation_for_plan;
+
+    if app_state.router_config.query_planner.no_plan_cache {
+        let plan = app_state
+            .planner
+            .plan_from_normalized_operation(
+                filtered_operation_for_plan,
+                request_override_context.into(),
+            )
+            .map_err(|err| req.new_pipeline_error(PipelineErrorVariant::PlannerError(err)))?;
+        return Ok(Arc::new(plan));
+    }
     let plan_cache_key =
         calculate_cache_key(filtered_operation_for_plan.hash(), &stable_override_context);
-
     let query_plan_arc = match app_state.plan_cache.get(&plan_cache_key).await {
         Some(plan) => plan,
         None => {

lib/router-config/src/query_planner.rs

@@ -7,4 +7,6 @@ pub struct QueryPlannerConfig {
     /// When set to `true` and an incoming request has a `hive-expose-query-plan: true` header, the query plan will be exposed in the response, as part of `extensions`.
     #[serde(default)]
     pub allow_expose: bool,
+    #[serde(default)]
+    pub no_plan_cache: bool,
 }