xuanyuanking opened a new pull request #27537: 
[WIP][SPARK-30668][SQL][FOLLOWUP] Raise exception instead of silent change for 
new TimestampFormatter
URL: https://github.com/apache/spark/pull/27537
 
 
   ### What changes were proposed in this pull request?
   This is a follow-up work for #27441. For the cases of new TimestampFormatter 
return null while legacy formatter can return a value, we need to throw an 
exception instead of silent change. The legacy config will be referenced in the 
error message.
   
   ### Why are the changes needed?
   Avoid silent result change for new behavior in 3.0. 
   
   ### Does this PR introduce any user-facing change?
   Yes, an exception is thrown when we detect legacy formatter can parse the 
string and the new formatter return null.
   
   ### How was this patch tested?
   Extend existing UT.
   

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