wgtmac commented on PR #47316:
URL: https://github.com/apache/arrow/pull/47316#issuecomment-3211110159

   ```
   TIME_MILLIS is the deprecated ConvertedType counterpart of a TIME logical 
type that is UTC normalized and has MILLIS precision.
   
   TIME_MICROS is the deprecated ConvertedType counterpart of a TIME logical 
type that is UTC normalized and has MICROS precision.
   ```
   
   I guess the only reason to default `isAdjustedToUTC=true` is to keep 
backward compatibility for `TIME_MILLIS` and `TIME_MICROS` converted types: 
https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#deprecated-time-convertedtype
   
   


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