ajantha-bhat commented on issue #8849:
URL: https://github.com/apache/iceberg/issues/8849#issuecomment-1765789016

   Hmm, It is not just the null check addition in the procedure, later it fails 
because reference MAIN does not exist during replace branch. 
   
   
https://github.com/apache/iceberg/blob/46cad6ddaeff8104d96defab25206a4ff7e01629/core/src/main/java/org/apache/iceberg/UpdateSnapshotReferencesOperation.java#L123
   
   The reason is we create the main branch only during first snapshot creation. 
   But in this scenario there is no main branch exist for replace operation. 
   I thought of blocking this scenario by throwing an exception. But since we 
support creating empty branch (from 
https://github.com/apache/iceberg/pull/8072/), we should also support replacing 
to/from empty branch. 
   
   I am thinking to add an empty/dummy snapshot for create table operation with 
MAIN reference in a sparate PR to tackle this.
   Let me know what you guys think, @amogh-jahagirdar, @ConeyLiu , @rdblue  


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