cloud-fan commented on a change in pull request #28646:
URL: https://github.com/apache/spark/pull/28646#discussion_r430531795
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeFormatterHelper.scala
##########
@@ -217,9 +217,15 @@ private object DateTimeFormatterHelper {
toFormatter(builder, TimestampFormatter.defaultLocale)
}
+ final val bugInStandAloneForm = {
+ val formatter = DateTimeFormatter.ofPattern("LLL", Locale.US)
Review comment:
This is a tradeoff we need to make. If we take locale into
consideration, then this can't be a static check. We may need to build a cache.
Since the default locale is US, and `LLL`/`qqq` is rarely used, the check
seems fine to me even if it can give false negative.
##########
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:
This is a bug in the time library of JDK, and is not related to JRE. I
think JDK is more precise.
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