danny0405 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_r407325507
 
 

 ##########
 File path: core/src/main/java/org/apache/calcite/plan/volcano/RuleQueue.java
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 @@ -196,7 +196,7 @@ VolcanoRuleMatch popMatch(VolcanoPlannerPhase phase) {
     phaseMatchList.matchMap.remove(
         planner.getSubset(match.rels[0]), match);
 
-    LOGGER.debug("Pop match: {}", match);
+    LOGGER.trace("Pop match: {}", match);
     return match;
 
 Review comment:
   Any strong reason why switch from `DEBUG` to `TRACE` ?

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