cloud-fan commented on PR #57834:
URL: https://github.com/apache/spark/pull/57834#issuecomment-5242946196

   Thanks, both points were valid. Addressed in `3a52323638b`:
   
   - Materialize the construction-time metadata iterable before inspecting it, 
preventing generator exhaustion.
   - Fetch and filter builder metadata per RPC, preserving dynamic values such 
as refreshed authentication tokens.
   - Updated the special `CachedRemoteRelation` ExecutePlan path to use the 
same filtered metadata and operation-ID header.
   - Added regression coverage for one-shot iterables and per-call metadata 
refresh.


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