mbecker opened a new issue #7276:
URL: https://github.com/apache/pinot/issues/7276


   Hi,
   
   I'm having a time format in the Kafka Messages as follows:
   ```sh
   "_time": "2021-08-10T07:08:08.873Z",
   ```
   
   I'm using the following schema for the date:
   ```json
   "dateTimeFieldSpecs": [
         {
           "name": "_time",
           "dataType": "STRING",
           "format": 
"1:MILLISECONDS:SIMPLE_DATE_FORMAT:yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
           "granularity": "1:MINUTES"
         }
       ],
   ```
   (I'm using a Java format here)
   
   How can I check that the ingest in Pinot is working with the specified date 
time field?
   
   Then in a Presto SQL the DATETIMECONVERT doesn't work as expected and 
returns an error:
   ```sql
   SELECT DATETIMECONVERT("_time", 
'1:MILLISECONDS:SIMPLE_DATE_FORMAT:yyyy-mm-ddTHH:MM:SS.%fZ', 
'1:DAYS:SIMPLE_DATE_FORMAT:yyyyMMdd', '1:DAYS'),
          max(value_number) AS max_1
   FROM abc.xyz
   LIMIT 1000;
   ```
   (Here I'm using a python format? as described in superset)
   
   The returned error is as follows:
   ```sh
   pinot error: must be real number, not dict
   ```
   
   How can I use the column "_time" with the RFC 3339 format as the date time 
field in Presto / Superset?
   
   Thanks for your held and cheers!
   
   


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