anew opened a new pull request, #55589:
URL: https://github.com/apache/spark/pull/55589

   ### What changes were proposed in this pull request?
   Add the spark-connect protos to support AutoCDC flows. This is mainly two 
new protos:
   
   `AutoCdcFlowDetails`: similar to the existing `WriteRelationFlowDetails`, 
describes an AutoCDC flow. 
    `SCDType` an enum to specify the type of SCD (slow changing dimension) 
storage type.
   
   For now, throw "not implemented" for the new flow type.
   
   ### Why are the changes needed?
   This new API is needed to specify an AutoCDC flow in a declarative pipeline.
   
   ### Does this PR introduce _any_ user-facing change?
   It introduces a new Spark Connect API, however, no implementation yet, and 
also no language wrappers (e.g. Python), yet.
   
   ### How was this patch tested?
   No tests, as this API is unimplemented for now. 
   
   ### Was this patch authored or co-authored using generative AI tooling?
   Generated-by: Claude Sonnet 4.6


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