wiring hooked up

lib/src/sparql/plan.rs

@@ -1,4 +1,5 @@
 use crate::sparql::GraphPattern;
+use crate::sparql::model::Variable;
 use crate::sparql::eval::StringOrStoreString;
 use crate::store::numeric_encoder::{
     EncodedQuad, EncodedTerm, Encoder, MemoryStrStore, StrContainer, StrLookup,
@@ -19,6 +20,7 @@ pub enum PlanNode {
     },
     Service {
         service_name: PatternValue,
+        variables: Vec<Variable>,
         child: Box<PlanNode>,
         graph_pattern: GraphPattern,
         silent: bool,

lib/src/sparql/plan_builder.rs

@@ -108,6 +108,7 @@ impl<E: Encoder> PlanBuilder<E> {
                 let graph_pattern = *p.clone();
                 PlanNode::Service {
                     service_name,
+                    variables: variables.clone(),
                     child: Box::new(self.build_for_graph_pattern(p, variables, service_name)?),
                     graph_pattern,
                     silent: *s,