cloud-fan commented on a change in pull request #27537: 
[SPARK-30668][SQL][FOLLOWUP] Raise exception instead of silent change for new 
DateFormatter
URL: https://github.com/apache/spark/pull/27537#discussion_r387599817
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeFormatterHelper.scala
 ##########
 @@ -57,6 +60,27 @@ trait DateTimeFormatterHelper {
     }
     formatter
   }
+
+  // When legacy time parser policy set to EXCEPTION, check whether we will 
get different results
+  // between legacy format and new format. For legacy parser, 
DateTimeParseException will not be
+  // thrown. On the contrary, if the legacy policy set to CORRECTED, 
DateTimeParseException will
 
 Review comment:
   `On the contrary, if the legacy policy set to CORRECTED ...`
   
   `If the legacy policy set to CORRECTED, do nothing and let the exception 
propagate.`

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