ulysses you created SPARK-29675:
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             Summary: Add exception when isolationLevel is Illegal
                 Key: SPARK-29675
                 URL: https://issues.apache.org/jira/browse/SPARK-29675
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.4
            Reporter: ulysses you


Now we use JDBC api and set an Illegal isolationLevel option, spark will throw 
a `scala.MatchError`, it's not friendly to user. So we should add an 
IllegalArgumentException.

 



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