waitingkuo commented on issue #3922:
URL: 
https://github.com/apache/arrow-datafusion/issues/3922#issuecomment-1287399593

   @alamb i think int32 isn't large enough for microsecond scale.
   `cast`ing timestamp[us]  to integer returns number of microseconds from 
1970, but 2^32-1 microseonds is just too small.
   
   ```bash
   ❯ select to_timestamp_micros(4294967295);
   +--------------------------------------+
   | totimestampmicros(Int64(4294967295)) |
   +--------------------------------------+
   | 1970-01-01 01:11:34.967295           |
   +--------------------------------------+
   1 row in set. Query took 0.000 seconds.
   ```


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