[opt](test) add more debug info in test_jdbc_catalog_ddl.groovy (apac…

…he#46323)

cherry-pick apache#46322

regression-test/suites/external_table_p0/jdbc/test_jdbc_catalog_ddl.groovy

@@ -39,6 +39,7 @@ suite("test_jdbc_catalog_ddl", "p0,external,mysql,external_docker,external_docke
                 "use_meta_cache" = "${useMetaCache}"
             );"""
             def res = sql(""" show databases from ${catalog_name}; """).collect {x -> x[0] as String}
+            println("show databases result " + res);
             def containedDb = ['mysql', 'doris_test', 'information_schema']
             for (final def db in containedDb) {
                 assertTrue(res.contains(db), 'Not contains db: `' + db + '` in mysql catalog')