[I] reduce recursion level of unparser part [datafusion]

["waynexia (via GitHub)" <gi...@apache.org>]

waynexia opened a new issue, #19787:
URL: https://github.com/apache/datafusion/issues/19787

   ### Is your feature request related to a problem or challenge?
   
   Related to https://github.com/apache/datafusion/pull/19109#discussion_r2670731564
   
   ### Describe the solution you'd like
   
   Unparser's deep recursion can overflow the stack easily, especially for complex analytical queries like those from tpc-h
   
   ### Describe alternatives you've considered
   
   Convert the current implementation to an iterative flavor
   
   ### Additional context
   
   _No response_


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