HyukjinKwon commented on PR #58602:
URL: https://github.com/apache/spark/pull/58602#issuecomment-5581921189

   To be clear for anyone finding this later: this is not a real problem in 
practice. Protobuf schema conversion recurses over a finite descriptor (bounded 
by the schema, not by input data), and recursive message types are already 
rejected by default (a repeated record name throws), so there is no unbounded 
recursion to guard against here. The proposed bound added no coverage and could 
regress legitimate deeply-nested non-recursive schemas, so this is not needed. 
Closing.


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