yaooqinn opened a new pull request, #50065:
URL: https://github.com/apache/spark/pull/50065

   ### What changes were proposed in this pull request?
   
   This PR set isParsing to false for the timestamp formatter in DESCRIBE AS 
JSON, because the formatter is not used for parsing datetime strings
   
   ### Why are the changes needed?
   
   
   Although it does not affect the final output due to the current fmt we use 
now being w/o 'S' portion, it can prevent potential bugs if we store/display 
higher-precision timestamps. 
   
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   
   ### How was this patch tested?
   
   Existing tests
   
   
   ### Was this patch authored or co-authored using generative AI tooling?
   No


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