cloud-fan commented on a change in pull request #32959:
URL: https://github.com/apache/spark/pull/32959#discussion_r662805329



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
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@@ -269,10 +274,6 @@ object DateTimeUtils {
           i += 3
         } else if (i < 2) {
           if (b == '-') {
-            if (i == 0 && j != 4) {
-              // year should have exact four digits

Review comment:
       Again, shall we check the number of year digits? what if overflow 
happens? like `999999999999999999-12-12`




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