MaxGekk commented on a change in pull request #26079: [SPARK-29369][SQL] 
Support string intervals without the `interval` prefix
URL: https://github.com/apache/spark/pull/26079#discussion_r333483069
 
 

 ##########
 File path: 
common/unsafe/src/main/java/org/apache/spark/unsafe/types/CalendarInterval.java
 ##########
 @@ -73,45 +72,50 @@ private static long toLong(String s) {
    * This method is case-insensitive.
    */
   public static CalendarInterval fromString(String s) {
-    if (s == null) {
-      return null;
-    }
-    s = s.trim();
-    Matcher m = p.matcher(s);
-    if (!m.matches() || s.compareToIgnoreCase("interval") == 0) {
+    try {
+      return fromCaseInsensitiveString(s);
+    } catch (IllegalArgumentException e) {
       return null;
-    } else {
-      long months = toLong(m.group(1)) * 12 + toLong(m.group(2));
-      long microseconds = toLong(m.group(3)) * MICROS_PER_WEEK;
-      microseconds += toLong(m.group(4)) * MICROS_PER_DAY;
-      microseconds += toLong(m.group(5)) * MICROS_PER_HOUR;
-      microseconds += toLong(m.group(6)) * MICROS_PER_MINUTE;
-      microseconds += toLong(m.group(7)) * MICROS_PER_SECOND;
-      microseconds += toLong(m.group(8)) * MICROS_PER_MILLI;
-      microseconds += toLong(m.group(9));
-      return new CalendarInterval((int) months, microseconds);
     }
   }
 
   /**
-   * Convert a string to CalendarInterval. Unlike fromString, this method can 
handle
+   * Convert a string to CalendarInterval. This method can handle
    * strings without the `interval` prefix and throws IllegalArgumentException
    * when the input string is not a valid interval.
    *
    * @throws IllegalArgumentException if the string is not a valid internal.
    */
   public static CalendarInterval fromCaseInsensitiveString(String s) {
 
 Review comment:
   This PR introduced code duplication 
https://github.com/apache/spark/pull/8034 for your code 
https://github.com/apache/spark/pull/7355 5 years ago.

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