mihaibudiu commented on PR #4696:
URL: https://github.com/apache/calcite/pull/4696#issuecomment-3676193805

   I tried to use these classes and I couldn't. 
   I think we can use any operator as long as we override the method to create 
a call.
   I am not sure it's enough to have collation extend SqlNode; wouldn't some 
visitors need to know about it too?
   I see that Collation in attributes is never set, but maybe it's used in 
derived classes.
   One can convert enums to SqlLiterals with string values. But how about the 
Locale in the Collation?


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