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