[fix](test) fix unstable jdbc ddl case (apache#46697)

### What problem does this PR solve?

When `use_meta_cache = false`, we should wait for database sync.

regression-test/data/external_table_p0/nereids_commands/test_nereids_refresh_catalog.out

@@ -1,13 +1,6 @@
 -- This file is automatically generated. You should know what you did if you want to edit this
 -- !database --
-DORIS
-Doris
-doris
 doris_test
-information_schema
-init_db
-mysql
-show_test_do_not_modify
 
 -- !ex_tb0_where --
 111
@@ -20,25 +13,9 @@ show_test_do_not_modify
 115	abg
 
 -- !preceding_create_external_database --
-DORIS
-Doris
-doris
-doris_test
-information_schema
-init_db
-mysql
-show_test_do_not_modify
 
 -- !subsequent_create_external_database --
-DORIS
-Doris
-doris
-doris_test
-information_schema
-init_db
-mysql
 new_mysql_db
-show_test_do_not_modify
 
 -- !sql_show_tables --
 
@@ -76,23 +53,7 @@ new_mysql_table2	CREATE TABLE `new_mysql_table2` (\n  `id` int NULL,\n  `name` v
 new_mysql_table2	CREATE TABLE `new_mysql_table2` (\n  `id` int NULL,\n  `name` varchar(20) NULL,\n  `new_column` int NULL,\n  `new_column_1` int NULL,\n  `new_column_2` int NULL\n) ENGINE=JDBC_EXTERNAL_TABLE;
 
 -- !preceding_drop_external_database --
-DORIS
-Doris
-doris
-doris_test
-information_schema
-init_db
-mysql
 new_mysql_db
-show_test_do_not_modify
 
 -- !subsequent_drop_external_database --
-DORIS
-Doris
-doris
-doris_test
-information_schema
-init_db
-mysql
-show_test_do_not_modify
 

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

@@ -15,6 +15,9 @@
 // specific language governing permissions and limitations
 // under the License.
 
+import java.util.concurrent.TimeUnit;
+import org.awaitility.Awaitility;
+
 suite("test_jdbc_catalog_ddl", "p0,external,mysql,external_docker,external_docker_mysql") {
 
     String enabled = context.config.otherConfigs.get("enableJdbcTest")
@@ -23,6 +26,18 @@ suite("test_jdbc_catalog_ddl", "p0,external,mysql,external_docker,external_docke
     String bucket = getS3BucketName()
     String driver_url = "https://${bucket}.${s3_endpoint}/regression/jdbc_driver/mysql-connector-java-5.1.49.jar"
     String mysql_port = context.config.otherConfigs.get("mysql_57_port");
+
+    def wait_db_sync = { String ctl ->
+        Awaitility.await().atMost(10, TimeUnit.SECONDS).pollInterval(1, TimeUnit.SECONDS).until{
+            try {
+                def res = sql "show databases from ${ctl}"
+                return res.size() > 0;
+            } catch (Exception e) {
+                e.printStackTrace();
+                return false;
+            }
+        }
+    }
     // String driver_url = "mysql-connector-java-5.1.49.jar"
     if (enabled != null && enabled.equalsIgnoreCase("true")) {
         String catalog_name = "test_jdbc_catalog_ddl";
@@ -38,6 +53,11 @@ suite("test_jdbc_catalog_ddl", "p0,external,mysql,external_docker,external_docke
                 "driver_class" = "com.mysql.jdbc.Driver",
                 "use_meta_cache" = "${useMetaCache}"
             );"""
+
+            if (useMetaCache.equals("false")) {
+                wait_db_sync("${catalog_name}")
+            }
+
             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']
@@ -68,6 +88,7 @@ suite("test_jdbc_catalog_ddl", "p0,external,mysql,external_docker,external_docke
 
             if (useMetaCache.equals("false")) {
                 sql """refresh catalog ${catalog_name}"""
+                wait_db_sync("${catalog_name}")
             }
             sql "use ${catalog_name}.temp_database"
             qt_sql01 """select * from temp_table"""

regression-test/suites/external_table_p0/nereids_commands/test_nereids_refresh_catalog.groovy

@@ -48,16 +48,16 @@ suite("test_nereids_refresh_catalog", "p0,external,mysql,external_docker,externa
         sql """CALL EXECUTE_STMT("${catalog_name}", "drop database if exists ${new_mysql_db}");"""
         sql """switch ${catalog_name}"""
 
-        qt_database """show databases;"""
+        qt_database """show databases like "%doris_test%";"""
         sql """ use ${ex_db_name}"""
 
         qt_ex_tb0_where """select id from ${ex_tb0} where id = 111;"""
         order_qt_ex_tb0  """ select id, name from ${ex_tb0} order by id; """
         // create database in mysql
         sql """CALL EXECUTE_STMT("${catalog_name}", "create database  ${new_mysql_db} ;");"""
-        qt_preceding_create_external_database """show databases;"""
+        qt_preceding_create_external_database """show databases like "%${new_mysql_db}%";"""
         checkNereidsExecute("refresh catalog ${catalog_name} ;")
-        qt_subsequent_create_external_database """show databases;"""
+        qt_subsequent_create_external_database """show databases like "%${new_mysql_db}%";"""
 
         checkNereidsExecute("refresh catalog ${catalog_name} properties ('invalid_cache'='true');")
         sql """use ${new_mysql_db}"""
@@ -94,10 +94,10 @@ suite("test_nereids_refresh_catalog", "p0,external,mysql,external_docker,externa
         qt_subsequent_refresh_table """show create table ${new_mysql_db}.${new_mysql_table2};"""
 
         sql """CALL EXECUTE_STMT("${catalog_name}", "drop database if exists ${new_mysql_db} ;");"""
-        qt_preceding_drop_external_database """show databases;"""
+        qt_preceding_drop_external_database """show databases like "%${new_mysql_db}%";"""
 
         checkNereidsExecute("refresh catalog ${catalog_name} properties ('invalid_cache'='true');")
-        qt_subsequent_drop_external_database """show databases;"""
+        qt_subsequent_drop_external_database """show databases like "%${new_mysql_db}%";"""
 
         sql """ drop catalog if exists ${catalog_name} ;"""
     }