Trouble reading external JDBC tables after upgrading from Databricks Runtime 5.5

Problem Attempting to read external tables via JDBC works fine on Databricks Runtime 5.5, but the same table reads fail on Databricks Runtime 6.0 and above. You see an error similar to the following: com.databricks.backend.common.rpc.DatabricksExceptions$SQLExecutionException: java.util.concurrent.ExecutionException: org.apache.spark.sql.AnalysisExc...

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