conf = new TajoConf();
Path testDir = CommonTestingUtil.getTestDir("target/test-data/TestDBSTore");
File absolutePath = new File(testDir.toUri());
conf.set(CatalogConstants.JDBC_URI, "jdbc:derby:"+absolutePath.getAbsolutePath()+"/db;create=true");
LOG.info("derby repository is set to "+conf.get(CatalogConstants.JDBC_URI));
store = new DerbyStore(conf);
}