cloud-fan commented on a change in pull request #32266:
URL: https://github.com/apache/spark/pull/32266#discussion_r620092134



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala
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@@ -93,6 +93,24 @@ object IntervalUtils {
 
   private val yearMonthPattern = "^([+|-])?(\\d+)-(\\d+)$".r
 
+  def safeFromYearMonthString(input: UTF8String): Option[Int] = {
+    try {
+      if (input == null || input.toString == null) {
+        throw new IllegalArgumentException("Interval year-month string must be 
not null")
+      } else {
+        val regex = "INTERVAL '([-|+]?[0-9]+-[-|+]?[0-9]+)' YEAR TO MONTH".r

Review comment:
       For parsing I think it's OK to be always case insensitive. The Spark SQL 
parser is case insensitive.




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