[I] Upsert with NULL value not working [iceberg-python]

[via GitHub]

Benjamin-Lemaire opened a new issue, #1835:
URL: https://github.com/apache/iceberg-python/issues/1835

   ### Apache Iceberg version
   
   None
   
   ### Please describe the bug 🐞
   
   The upsert function does not work when one of the two fields used for 
comparison is NULL. The diff_expr variable needs to be enhanced to handle NULL 
values in the fields being compared, as the expression 'value' != NULL will 
never evaluate to true.
   
   Here is how I fixed it locally from module `upsert_util.py`
   
   
![Image](https://github.com/user-attachments/assets/39962f85-678d-4f5e-92f7-700bdd8097b3)
   
   ### Willingness to contribute
   
   - [ ] I can contribute a fix for this bug independently
   - [ ] I would be willing to contribute a fix for this bug with guidance from 
the Iceberg community
   - [ ] I cannot contribute a fix for this bug at this time


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