[GitHub] [incubator-doris] wangshuo128 commented on a diff in pull request #9470: [refactor](Nereids): small refactor

[GitBox <gi...@apache.org>]

wangshuo128 commented on code in PR #9470:
URL: https://github.com/apache/incubator-doris/pull/9470#discussion_r867792476


##########
fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Memo.java:
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@@ -21,19 +21,21 @@
 import org.apache.doris.nereids.trees.plans.logical.LogicalPlan;
 
 import com.google.common.collect.Lists;
+import org.glassfish.jersey.internal.guava.Sets;
 
+import java.util.HashSet;
 import java.util.List;
 
 /**
  * Representation for memo in cascades optimizer.
  */
 public class Memo {
     private final List<Group> groups = Lists.newArrayList();
-    private final List<PlanReference> planReferences = Lists.newArrayList();
+    private final HashSet<GroupExpression> groupExpressions = Sets.newHashSet();

Review Comment:
   ```suggestion
       private final Set<GroupExpression> groupExpressions = Sets.newHashSet();
   ```



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