cloud-fan commented on a change in pull request #28646:
URL: https://github.com/apache/spark/pull/28646#discussion_r430944614



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeFormatterHelper.scala
##########
@@ -244,6 +250,12 @@ private object DateTimeFormatterHelper {
           for (style <- unsupportedNarrowTextStyle if 
patternPart.contains(style)) {
             throw new IllegalArgumentException(s"Too many pattern letters: 
${style.head}")
           }
+          if (bugInStandAloneForm && (patternPart.contains("LLL") || 
patternPart.contains("qqq"))) {
+            throw new IllegalArgumentException("The current JDK has a bug to 
support stand-alone " +

Review comment:
       JCL is not a widely used word. I picked `Java` to make it general and 
easy to understand.




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