[PR] [SPARK-51388][SQL] Improve SQL fragment propagation in to_timestamp and UNION [spark]

[via GitHub]

vladimirg-db opened a new pull request, #50154:
URL: https://github.com/apache/spark/pull/50154

   ### What changes were proposed in this pull request?
   
   Improve SQL fragment propagation in to_timestamp and UNION.
   
   ### Why are the changes needed?
   
   To improve error messages:
   
![image](https://github.com/user-attachments/assets/4952ce49-5a29-4bf7-9d9f-0e443b1127ec)
   
   
   ### Does this PR introduce _any_ user-facing change?
   
   Invalid `Cast` error messages become better.
   
   ### How was this patch tested?
   
   Golden file tests are regenerated.
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   No.


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