fix: ensure variables passed to subgraph requests

Author: rawkode

lib/executor/src/execution/plan.rs

@@ -522,6 +522,12 @@ impl<'exec> Executor<'exec> {
         node: &FetchNode,
         representations: Option<Vec<u8>>,
     ) -> Result<ExecutionJob, PlanExecutionError> {
+        let variable_refs = self.variable_values.as_ref().map(|vars| {
+            vars.iter()
+                .map(|(key, value)| (key.as_str(), value))
+                .collect::<HashMap<&str, &sonic_rs::Value>>()
+        });
+
         Ok(ExecutionJob::Fetch(FetchJob {
             fetch_node_id: node.id,
             response: self
@@ -532,7 +538,7 @@ impl<'exec> Executor<'exec> {
                         query: node.operation.document_str.as_str(),
                         dedupe: self.dedupe_subgraph_requests,
                         operation_name: node.operation_name.as_deref(),
-                        variables: None,
+                        variables: variable_refs,
                         representations,
                     },
                 )