Jackie-Jiang commented on a change in pull request #7804:
URL: https://github.com/apache/pinot/pull/7804#discussion_r761600020



##########
File path: 
pinot-spi/src/main/java/org/apache/pinot/spi/data/DateTimeFormatPatternSpec.java
##########
@@ -52,7 +66,28 @@ public DateTimeFormatPatternSpec(String timeFormat, String 
sdfPatternWithTz) {
         String timezoneString = m.group(TIMEZONE_GROUP).trim();
         _dateTimeZone = 
DateTimeZone.forTimeZone(TimeZone.getTimeZone(timezoneString));
       }
+      validateSdfPattern(_sdfPattern, requireLexicographicOrdering);
       _dateTimeFormatter = 
DateTimeFormat.forPattern(_sdfPattern).withZone(_dateTimeZone).withLocale(DEFAULT_LOCALE);
+
+    }
+  }
+
+  private static void validateSdfPattern(String sdfPattern, boolean 
requireLexicographicOrdering) {

Review comment:
       We can move it into `DateTimeUtils` and move the validation into the 
`SchemaUtils.validate()`. The validation logic should not be within the spi




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