cloud-fan commented on a change in pull request #28592:
URL: https://github.com/apache/spark/pull/28592#discussion_r429071489
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeFormatterHelper.scala
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@@ -86,6 +86,33 @@ trait DateTimeFormatterHelper {
throw e
}
}
+
+ /**
+ * When the new DateTimeFormatter failed to initialize because of invalid
datetime pattern, it
+ * will throw IllegalArgumentException. If the pattern can be recognized by
the legacy formatter
+ * it will raise SparkUpgradeException to tell users to restore the previous
behavior via LEGACY
+ * policy or follow our guide to correct their pattern. Otherwise, the
original
+ * IllegalArgumentException will be thrown.
+ *
+ * @param pattern the date time pattern
+ * @param block a func to capture exception, identically which forces a
legacy datetime formatter
Review comment:
`block` is a bad name. How about `tryLegacyFormatter`?
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