chunweilei commented on a change in pull request #1910: [CALCITE-3915] Add rule 
listener to report rule attempts and time at …
URL: https://github.com/apache/calcite/pull/1910#discussion_r407318309
 
 

 ##########
 File path: 
core/src/main/java/org/apache/calcite/plan/volcano/VolcanoPlanner.java
 ##########
 @@ -64,19 +45,8 @@
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
-import java.util.ArrayDeque;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Comparator;
-import java.util.Deque;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.IdentityHashMap;
-import java.util.Iterator;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import java.text.NumberFormat;
+import java.util.*;
 
 Review comment:
   I think it's not expected considering the calcite code convention.

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