fusion2222 commented on issue #1045:
URL: 
https://github.com/apache/iceberg-python/issues/1045#issuecomment-2614600767

   At this point I looked on code 4 hours about how to adjust unit test 
mentioned by @kevinjqliu. But code is so complicated and it is hard to navigate 
for a newcomer.
   
   Even if I correct assertion for throwing exception with message `"Column 
'quux' has an unsupported type: timestamp[ns, tz=UTC]"`, there is still 
assertion for warning:
   ```
   Iceberg does not yet support 'ns' timestamp precision. Use 
'downcast-ns-timestamp-to-us-on-write' configuration property to automatically 
downcast 'ns' to 'us' on write.`. 
   ```
   
   This is triggered by `pyiceberg.io.pyarrow._ConvertToIceberg.primitive` 
somewhere deep in `Table.add_files`. Code does not have sensible comments 
explain **why** this warning is shown. Is this some sort of limit in some 3rd 
party library? Or something else?
   


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