waitingkuo commented on issue #7958:
URL: 
https://github.com/apache/arrow-datafusion/issues/7958#issuecomment-1784074103

   @alamb @comphead 
   i'm not familiar with parquet parser, i assume that time casting is dealed 
by timestamp casting but not to_timestamp function. 
   The behaviors for `casting` and `to_timestamp` are now different after #7844 
merged
   
   ```bash
   ❯ select to_timestamp(1), arrow_typeof(to_timestamp(1));
   +------------------------+--------------------------------------+
   | to_timestamp(Int64(1)) | arrow_typeof(to_timestamp(Int64(1))) |
   +------------------------+--------------------------------------+
   | 1970-01-01T00:00:01    | Timestamp(Second, None)              |
   +------------------------+--------------------------------------+
   1 row in set. Query took 0.004 seconds.
   
   ❯ select 1::timestamp, arrow_typeof(1::timestamp);
   +-------------------------------+-----------------------------+
   | Int64(1)                      | arrow_typeof(Int64(1))      |
   +-------------------------------+-----------------------------+
   | 1970-01-01T00:00:00.000000001 | Timestamp(Nanosecond, None) |
   +-------------------------------+-----------------------------+
   ```


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