dramaticlly commented on PR #17638:
URL: https://github.com/apache/iceberg/pull/17638#issuecomment-5350417806

   > >Note withCredentials appends rather than replaces, so 
toBuilder().withCredentials(extra) preserves any existing credentials; the 
TestRESTScanPlanning simplification is behavior-preserving.
   > 
   > 
   > 
   > This is actually quite surprising imo. I know it's an existing behavior 
but I feel like that's definitley not expected from a builder API; I forget if 
this was intentional or not, maybe @singhpk234 remembers. I guess it's not an 
issue hit in practice but I feel like we should have this replace credentials, 
and if we have a need for adding, we could do an `addCredentials`.
   
   Thanks @amogh-jahagirdar , once we figured out the expected behaviour, happy 
to follow up and give a pass for all builder method deal with collections.


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