R-JunmingChen commented on PR #36739:
URL: https://github.com/apache/arrow/pull/36739#issuecomment-1678311281

   >I think it is possible to define 2 explicit public functions of the class 
SetLookupOptions:
   >
   >SetLookupOptions(Datum value_set, bool skip_nulls = false) (same as 
currently)
   >SetLookupOptions(Datum value_set, NullMatchingBehavior 
null_matching_behavior = NullMatchingBehavior::MATCH)
   
   Do you mean we remove the member variable `skip_nulls` and make it a 
parameter in constructor function and then translate the `skip_nulls` to 
`NullMatchingBehavior` ?
   
   I think this way will affect some users who set `skip_nulls` directly via 
member variable. Does it ok?
   
   If we don't remove member variable `skip_nulls, the translation problem 
still exists. For example:
   
   ```
   SetLookupOptions option(value_set);
   option.skip_nulls = true;
   ```


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