dongjoon-hyun commented on a change in pull request #24516: [SPARK-27624][CORE] 
Fix CalenderInterval to show an empty interval correctly
URL: https://github.com/apache/spark/pull/24516#discussion_r281042412
 
 

 ##########
 File path: 
common/unsafe/src/main/java/org/apache/spark/unsafe/types/CalendarInterval.java
 ##########
 @@ -321,6 +321,10 @@ public String toString() {
       appendUnit(sb, rest, "microsecond");
     }
 
+    if (months == 0 && microseconds == 0) {
+      sb.append(" 0 microseconds");
 
 Review comment:
   Thank you for review, @srowen . 

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