nicovak opened a new issue, #8512:
URL: https://github.com/apache/pinot/issues/8512

   Hello,
   
   I think It could be a nice feature to handle optional parts in date format 
with `[]`
   For example in my case, I can have DateTime with second fractions or not 
(it's adaptive).
   
   Actually, I need to perform a `Substr` :
   
   ```json
   FromDateTime(Substr(JSONPATH(payload, '$.created_at'), 0, 19), 
'yyyy-MM-dd''T''HH:mm:ss''Z''')
   ```
   
   But It could be handled like that : 
   
   ```json
   FromDateTime(JSONPATH(payload, '$.created_at'), 
'yyyy-MM-dd''T''HH:mm:ss[.SSS]''Z''')
   ```
   
   It's already provided by Java 8 and 
[DateTimeFormatter](https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html),
 in documentation we have : 
   
   ```
      [       optional section start
      ]       optional section end
   ```


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