zabetak commented on a change in pull request #1869: [CALCITE-3868] Remove 
redundant ruleSet and ruleNames in VolcanoPlanner
URL: https://github.com/apache/calcite/pull/1869#discussion_r396993936
 
 

 ##########
 File path: 
core/src/main/java/org/apache/calcite/plan/volcano/VolcanoPlanner.java
 ##########
 @@ -392,35 +382,24 @@ public RelSet getSet(RelNode rel) {
     this.mapRel2Subset.clear();
     this.relImportances.clear();
     this.ruleQueue.clear();
-    this.ruleNames.clear();
     this.materializations.clear();
     this.latticeByName.clear();
     this.provenanceMap.clear();
   }
 
   public List<RelOptRule> getRules() {
-    return ImmutableList.copyOf(ruleSet);
+    return ImmutableList.copyOf(mapDescToRule.values());
   }
 
   public boolean addRule(RelOptRule rule) {
 
 Review comment:
   If we choose to add this method to the superclass (instead of having 
`mapRuleDescription`) then here we can ovverride. 

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