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The unit test `JdbcDataSourceTest.java` was originally implemented using the H2 database, which is no longer available in Impala's environment. The test code was also outdated and erroneous. This commit addresses and fixes the failure of JdbcDataSourceTest.java and rewrites it in Postgres, hence ensures compatibility with Impala's current environment and aligns with JDBC and external data source APIs. Please note, this test is moved to fe folder to fix the BackendConfig instance not initialized error. To test this file, run the following command: pushd fe && mvn -fae test -Dtest=JdbcDataSourceTest Please note that the tests in JdbcDataSourceTest have a dependency on previous tests and individual tests cannot be ran separately for this class. Change-Id: Ie07173d256d73c88f5a6c041f087db16b6ff3127 Reviewed-on: http://gerrit.cloudera.org:8080/21805 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>