adriangb commented on PR #22372:
URL: https://github.com/apache/datafusion/pull/22372#issuecomment-4527262657

   > If I used `with_table_partition_cols` I would expect partition_cols to be 
ultimately thing that rewrites `self.table_partition_cols` with incoming 
`partition_cols`. However the method adding them to already existing.
   
   That's a good point. The builder API for a mutable `Vec<..>` field could go 
one of two ways: append or replace. My intuition is that we should make it 
clear which one it is. I don't think there are any tests or uses of appending 
internally, so I would suggest we just error if the existing list is non-empty. 
@Dandandan @comphead wdyt?


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