daijyc opened a new pull request #32373:
URL: https://github.com/apache/spark/pull/32373


   ### What changes were proposed in this pull request?
   Fix the behavior of IsolatedClientLoader to load system classes first.
   
   ### Why are the changes needed?
   By convention, Spark shall use system jars first unless 
spark.driver.userClassPathFirst is defined. There's no reason the break the 
contract when loading HMS client jar using IsolatedClientLoader.
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   ### How was this patch tested?
   Unit test added in HiveUtilsSuite


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