waitingkuo commented on issue #7958:
URL: 
https://github.com/apache/arrow-datafusion/issues/7958#issuecomment-1784890619

   `Timestamp` in SQL maps to `Timestamp(Nanosecond, tz)` for now.
   
https://github.com/apache/arrow-datafusion/blob/9b45967edc6dba312ea223464dad3e66604d2095/datafusion/sql/src/planner.rs#L346
   
   So far, `1::timestamp` in datafusion treat `int 1` as `1 ns` which is same 
as pyarrow
   ```python
   In [8]: pa.array([1]).cast(pa.timestamp('ns'))
   Out[8]: 
   <pyarrow.lib.TimestampArray object at 0x11969d2e0>
   [
     1970-01-01 00:00:00.000000001
   ]
   ```
   
   @alamb @avantgardnerio @liukun4515 any thoughts about this?


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