GWphua commented on code in PR #18477:
URL: https://github.com/apache/druid/pull/18477#discussion_r2320967879


##########
processing/src/main/java/org/apache/druid/java/util/common/Intervals.java:
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@@ -53,6 +57,46 @@ public static Interval of(String format, Object... 
formatArgs)
     return of(StringUtils.format(format, formatArgs));
   }
 
+  /**
+   * @return Null if cannot parse with optimized strategy, else return the 
Interval.

Review Comment:
   Hi @kfaraz, thanks for the quick review. I have incorporated your 
suggestions. 
   
   Regarding the short circuit, I agree we can add a short-circuit for working 
with Periods , though it is hard to find an exhaustive way to cover all 
fallback cases. 
   
   I have listed all cases i can think of under the test file. Here's a TLDR of 
what's considered fallback.
   
   ```
   // Zulu without millis
   "2022-01-01T00:00:00Z/2022-01-02T00:00:00Z",
   // Date-only
   "2022-01-01/2022-01-02",
   // start/period
   "2022-01-01T12:00:00Z/PT6H",
   // period/end
   "P2DT3H4M5S/2022-01-01T00:00:00Z"
   ```



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