srowen commented on a change in pull request #34153:
URL: https://github.com/apache/spark/pull/34153#discussion_r720859389
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeFormatterHelper.scala
##########
@@ -322,6 +323,13 @@ private object DateTimeFormatterHelper {
(isParsing && unsupportedLettersForParsing.contains(c))) {
throw new IllegalArgumentException(s"Illegal pattern character:
$c")
}
+ // SPARK-36796: `select date_format('2018-11-17 13:33:33.333', 'B')`
failed with Java 8,
+ // but use Java 17 will return `in the afternoon` because 'B' is
used to represent
+ // `Pattern letters to output a day period` in Java 17 and disabled
it here for
+ // compatibility with Java 8 behavior.
+ for (c <- patternPart if unknownPatternLetters.contains(c)) {
Review comment:
@MaxGekk
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