abmo-x opened a new pull request, #6301:
URL: https://github.com/apache/iceberg/pull/6301

   Update schema currently does not check if the field is optional/required and 
adds all new fields as optional. This leads to incorrect schema evolution where 
a required filed gets added to a table schema as optional. 
   
   With this change, a required field can only be added if 
'allowIncompatibleChanges' is enabled. 


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