ZENOTME commented on code in PR #569:
URL: https://github.com/apache/iceberg-python/pull/569#discussion_r1946187013


##########
pyiceberg/table/__init__.py:
##########
@@ -292,7 +303,13 @@ def _apply(self, updates: Tuple[TableUpdate, ...], 
requirements: Tuple[TableRequ
             requirement.validate(self.table_metadata)
 
         self._updates += updates
-        self._requirements += requirements
+
+        # For the requirements, it does not make sense to add a requirement 
more than once
+        # For example, you cannot assert that the current schema has two 
different IDs
+        existing_requirements = {type(requirement) for requirement in 
self._requirements}
+        for new_requirement in requirements:
+            if type(new_requirement) not in existing_requirements:
+                self._requirements = self._requirements + requirements

Review Comment:
   Hi, I'm not sure why is not `self._requirements = self._requirements + 
new_requirement` instead of `self._requirements = self._requirements + 
requirements`. If we meet something like `[requirement1(not in 
existing_requirements), requirement2(in existing_requirements)]`, looks like 
this code will include all requirement? Is something or context I miss? 



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