reduce recursion level of unparser part
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enhancement
- Dominant language
- Rust
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Description
### 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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