cloud-fan commented on a change in pull request #32266:
URL: https://github.com/apache/spark/pull/32266#discussion_r622784637



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala
##########
@@ -92,6 +93,30 @@ object IntervalUtils {
   }
 
   private val yearMonthPattern = "^([+|-])?(\\d+)-(\\d+)$".r
+  private val yearMonthStringPattern =
+    
"^(INTERVAL\\s+)([+|-])?(')([+|-])?(\\d+)-(\\d+)(')(\\s+YEAR\\s+TO\\s+MONTH)$".r
+
+  def castStringToYMInterval(input: UTF8String): CalendarInterval = {
+    input.trimAll().toString.toUpperCase(Locale.ROOT) match {
+      case yearMonthPattern("-", year, month) => toYMInterval(year, month, -1)
+      case yearMonthPattern(_, year, month) => toYMInterval(year, month, 1)
+      case yearMonthStringPattern(_, prefixSign, _, suffixSign, year, month, 
_, _) =>
+        (prefixSign, suffixSign) match {
+          case ("-", "-") => toYMInterval(year, month, 1)
+          case ("-", _) => toYMInterval(year, month, -1)
+          case (_, "-") => toYMInterval(year, month, -1)
+          case (_, _) => toYMInterval(year, month, 1)
+        }
+      case yearMonthStringPattern(_, null, _, "-", year, month, _, _) =>

Review comment:
       isn't it covered by the case above?




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