Zach

Hi @nightscape, i finalized my tests on release 0.18.6-beta1, looks good to me. I have one more suggestion about the version number scheme, please see [0.18.6-beta1](https://github.com/crealytics/spark-excel/pull/697#issuecomment-1386080087)

Great finding! GenericObjectPool supports tests/validations indeed. We would also need to implement the validation method in JdbcClientPoolFactory, inherited default implementation just returns true: `override def validateObject(p: PooledObject[SqlConnection]): Boolean` And question...