[GitHub] [spark] yaooqinn commented on a change in pull request #28727: [SPARK-31879][SQL][test-java11] Preset monday start(iso) for the first day of week by reflection

[GitBox <gi...@apache.org>]

yaooqinn commented on a change in pull request #28727:
URL: https://github.com/apache/spark/pull/28727#discussion_r435233117



##########
File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeFormatterHelper.scala
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@@ -155,7 +157,22 @@ trait DateTimeFormatterHelper {
   }
 }
 
-private object DateTimeFormatterHelper {
+private[spark] object DateTimeFormatterHelper {
+  val defaultLocale = Locale.US
+
+  def presetSundayStartToMondayStart(): Unit = {
+    val CACHE: Field = classOf[WeekFields].getDeclaredField("CACHE")

Review comment:
       Only for those trying to use the original value of `SUNDAY FISRT and 1 mininalDay`. This seems not to be a good way though.




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