jackylee-ch commented on PR #47268:
URL: https://github.com/apache/spark/pull/47268#issuecomment-2219465255

   > Will it cover `multiple` nested scenes? The solution here seems to still 
bypass the child's lazy execution, right?
   
   Yes, it cover the `multiple` nested scenes.  And yes the `children.evaluate` 
execute first, but we postpone the handling of Exceptions to ensure that the 
children's exceptions can be obtained during GenericUDF.eval. When facing 
multiple layers of GenericUDF, if the innermost child throws an exception, we 
also gradually execute the child GenericUDFs and handle the thrown exceptions 
layer by layer until the top layer.


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