HyukjinKwon commented on PR #52980:
URL: https://github.com/apache/spark/pull/52980#issuecomment-3529115068

   For now, we have been using naive datetimes so far, which matches with 
`TimestampType` concept without a timezone. I think we should probably just 
focus on fixing the perf issue in this PR instead of fixing other bugs together.
   
   Another thing is that `spark.sql.session.timeZone` takes care about the 
timestamp diff only in Spark operators - it doesn't affect UDF executions. The 
same applies to Scala/Java UDF executions as well.


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