rdblue commented on PR #9556:
URL: https://github.com/apache/iceberg/pull/9556#issuecomment-1917527435

   Merging this. Thanks @amogh-jahagirdar!
   
   > It is still not clear how a wrong nullability info in MergeRows led to 
inserting default values.
   
   @aokolnychyi, I think what's happening is that the nullability flag is not 
checked when copying the row from the `MergeRows` output. The "default" values 
are null values coming from looking at unset values in `UnsafeRow`.


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