sam-1112 commented on PR #5956:
URL: 
https://github.com/apache/datafusion-comet/pull/5956#issuecomment-5999516834

   Thanks, @andygrove . Fixed both:
   
   - The merge now checks the selected result’s validity and preserves legacy 
nulls instead of reading the underlying slot. Added a `Long.MaxValue` case in 
`trunc_timestamp.sql` to catch the epoch-zero regression, plus a Rust test 
covering null preservation in mixed batches.
   - Changed the Havana row to `2020-11-15T12:00:00Z` and updated the comment.


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