ding-young commented on PR #15589:
URL: https://github.com/apache/datafusion/pull/15589#issuecomment-2780386375

   > This optimizer transformation doesn't look right for projected columns like
   > 
   > ```
   > create table t1(v1 int);
   > insert into t1 values (null);
   > 
   > select v1=v1 from t1;
   > -- Should return `NULL`, but get `False`
   > ```
   > 
   > However it makes sense if it is only applied on filter expressions.
   
   Thank you for review. I'll make the change


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