liyafan82 commented on a change in pull request #1853: [CALCITE-3851] Store 
nodes with zero importance with a set
URL: https://github.com/apache/calcite/pull/1853#discussion_r391384985
 
 

 ##########
 File path: 
core/src/main/java/org/apache/calcite/plan/volcano/VolcanoPlanner.java
 ##########
 @@ -917,13 +917,13 @@ RelNode changeTraitsUsingConverters(
   public void setImportance(RelNode rel, double importance) {
     assert rel != null;
     if (importance == 0d) {
-      relImportances.put(rel, importance);
+      nodesToSkip.add(rel);
     }
   }
 
   Double getImportance(RelNode rel) {
     assert rel != null;
-    return relImportances.get(rel);
+    return nodesToSkip.contains(rel) ? 0d : null;
   }
 
 Review comment:
   Removed. Thanks for the good suggestion. 

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