[improvement](iceberg)add some description for show create

fe/fe-core/src/main/java/org/apache/doris/catalog/Env.java

@@ -138,6 +138,7 @@
 import org.apache.doris.datasource.es.EsRepository;
 import org.apache.doris.datasource.hive.HiveTransactionMgr;
 import org.apache.doris.datasource.hive.event.MetastoreEventsProcessor;
+import org.apache.doris.datasource.iceberg.IcebergExternalTable;
 import org.apache.doris.deploy.DeployManager;
 import org.apache.doris.deploy.impl.AmbariDeployManager;
 import org.apache.doris.deploy.impl.K8sDeployManager;
@@ -317,6 +318,7 @@
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
@@ -3917,6 +3919,20 @@ public static void getDdlStmt(DdlStmt ddlStmt, String dbName, TableIf table, Lis
             sb.append("\"table\" = \"").append(jdbcTable.getJdbcTable()).append("\",\n");
             sb.append("\"table_type\" = \"").append(jdbcTable.getJdbcTypeName()).append("\"");
             sb.append("\n)");
+        } else if (table.getType() == TableType.ICEBERG_EXTERNAL_TABLE) {
+            addTableComment(table, sb);
+            org.apache.iceberg.Table icebergTable = ((IcebergExternalTable) table).getIcebergTable();
+            sb.append("\nLOCATION '").append(icebergTable.location()).append("'");
+            sb.append("\nPROPERTIES (");
+            Iterator<Entry<String, String>> iterator = icebergTable.properties().entrySet().iterator();
+            while (iterator.hasNext()) {
+                Entry<String, String> prop = iterator.next();
+                sb.append("\n  \"").append(prop.getKey()).append("\" = \"").append(prop.getValue()).append("\"");
+                if (iterator.hasNext()) {
+                    sb.append(",");
+                }
+            }
+            sb.append("\n)");
         }
 
         createTableStmt.add(sb + ";");
@@ -6366,7 +6382,7 @@ public void compactTable(AdminCompactTableStmt stmt) throws DdlException {
         AgentTaskExecutor.submit(batchTask);
     }
 
-    private static void addTableComment(Table table, StringBuilder sb) {
+    private static void addTableComment(TableIf table, StringBuilder sb) {
         if (StringUtils.isNotBlank(table.getComment())) {
             sb.append("\nCOMMENT '").append(table.getComment(true)).append("'");
         }

fe/fe-core/src/main/java/org/apache/doris/catalog/TableIf.java

@@ -428,7 +428,8 @@ default boolean needReadLockWhenPlan() {
      * Doris table type.
      */
     enum TableType {
-        MYSQL, ODBC, OLAP, SCHEMA, INLINE_VIEW, VIEW, BROKER, ELASTICSEARCH, HIVE, ICEBERG, @Deprecated HUDI, JDBC,
+        MYSQL, ODBC, OLAP, SCHEMA, INLINE_VIEW, VIEW, BROKER, ELASTICSEARCH, HIVE,
+        @Deprecated ICEBERG, @Deprecated HUDI, JDBC,
         TABLE_VALUED_FUNCTION, HMS_EXTERNAL_TABLE, ES_EXTERNAL_TABLE, MATERIALIZED_VIEW, JDBC_EXTERNAL_TABLE,
         ICEBERG_EXTERNAL_TABLE, TEST_EXTERNAL_TABLE, PAIMON_EXTERNAL_TABLE, MAX_COMPUTE_EXTERNAL_TABLE,
         HUDI_EXTERNAL_TABLE, TRINO_CONNECTOR_EXTERNAL_TABLE, LAKESOUl_EXTERNAL_TABLE;

fe/fe-core/src/main/java/org/apache/doris/datasource/iceberg/IcebergExternalDatabase.java

@@ -21,6 +21,11 @@
 import org.apache.doris.datasource.ExternalDatabase;
 import org.apache.doris.datasource.InitDatabaseLog;
 
+import org.apache.iceberg.catalog.Namespace;
+import org.apache.iceberg.catalog.SupportsNamespaces;
+
+import java.util.Map;
+
 public class IcebergExternalDatabase extends ExternalDatabase<IcebergExternalTable> {
 
     public IcebergExternalDatabase(ExternalCatalog extCatalog, Long id, String name) {
@@ -31,4 +36,10 @@ public IcebergExternalDatabase(ExternalCatalog extCatalog, Long id, String name)
     protected IcebergExternalTable buildTableForInit(String tableName, long tblId, ExternalCatalog catalog) {
         return new IcebergExternalTable(tblId, tableName, name, (IcebergExternalCatalog) extCatalog);
     }
+
+    public String getLocation() {
+        Map<String, String> props = ((SupportsNamespaces) ((IcebergExternalCatalog) getCatalog()).getCatalog())
+                .loadNamespaceMetadata(Namespace.of(name));
+        return props.getOrDefault("location", "");
+    }
 }

fe/fe-core/src/main/java/org/apache/doris/qe/ShowExecutor.java

@@ -199,6 +199,8 @@
 import org.apache.doris.datasource.hive.HMSExternalCatalog;
 import org.apache.doris.datasource.hive.HMSExternalTable;
 import org.apache.doris.datasource.hive.HiveMetaStoreClientHelper;
+import org.apache.doris.datasource.iceberg.IcebergExternalCatalog;
+import org.apache.doris.datasource.iceberg.IcebergExternalDatabase;
 import org.apache.doris.datasource.maxcompute.MaxComputeExternalCatalog;
 import org.apache.doris.job.manager.JobManager;
 import org.apache.doris.load.DeleteHandler;
@@ -1099,6 +1101,12 @@ private void handleShowCreateDb() throws AnalysisException {
                     .append(" LOCATION '")
                     .append(db.getLocationUri())
                     .append("'");
+        } else if (catalog instanceof IcebergExternalCatalog) {
+            IcebergExternalDatabase db = (IcebergExternalDatabase) catalog.getDbOrAnalysisException(showStmt.getDb());
+            sb.append("CREATE DATABASE `").append(showStmt.getDb()).append("`")
+                .append(" LOCATION '")
+                .append(db.getLocation())
+                .append("'");
         } else {
             DatabaseIf db = catalog.getDbOrAnalysisException(showStmt.getDb());
             sb.append("CREATE DATABASE `").append(ClusterNamespace.getNameFromFullName(showStmt.getDb())).append("`");

regression-test/suites/external_table_p0/iceberg/test_iceberg_show_create.groovy

@@ -0,0 +1,73 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+suite("test_iceberg_show_create", "p0,external,doris,external_docker,external_docker_doris") {
+    String enabled = context.config.otherConfigs.get("enableIcebergTest")
+    if (enabled == null || !enabled.equalsIgnoreCase("true")) {
+        logger.info("disable iceberg test.")
+        return
+    }
+
+    String rest_port = context.config.otherConfigs.get("iceberg_rest_uri_port")
+    String minio_port = context.config.otherConfigs.get("iceberg_minio_port")
+    String externalEnvIp = context.config.otherConfigs.get("externalEnvIp")
+    String catalog_name = "test_iceberg_show_create"
+
+    sql """drop catalog if exists ${catalog_name}"""
+    sql """
+    CREATE CATALOG ${catalog_name} PROPERTIES (
+        'type'='iceberg',
+        'iceberg.catalog.type'='rest',
+        'uri' = 'http://${externalEnvIp}:${rest_port}',
+        "s3.access_key" = "admin",
+        "s3.secret_key" = "password",
+        "s3.endpoint" = "http://${externalEnvIp}:${minio_port}",
+        "s3.region" = "us-east-1"
+    );"""
+
+    sql """ switch ${catalog_name} """
+
+    String db1 = "test_db1"
+    String db2 = "test_db2"
+    String tb1 = "test_tb1"
+
+    sql """ drop table if exists ${db1}.${tb1} """
+    sql """ drop database if exists ${db1} """
+    sql """ drop database if exists ${db2} """
+
+    sql """ create database ${db1} properties ('location'='s3a://warehouse/wh/${db1}') """
+    sql """ create database ${db2} """
+
+    String result = ""
+    result = sql "show create database ${db1}"
+    logger.info("${result}")
+    assertTrue(result.toString().containsIgnoreCase("s3a://warehouse/wh/${db1}"))
+
+    result = sql "show create database ${db2}"
+    logger.info("${result}")
+    assertTrue(result.toString().containsIgnoreCase("s3a://warehouse/wh/${db2}"))
+
+    sql """ create table ${db1}.${tb1} (id int) """
+    result = sql "show create table ${db1}.${tb1}"
+    logger.info("${result}")
+    assertTrue(result.toString().containsIgnoreCase("s3a://warehouse/wh/${db1}/${tb1}"))
+
+    sql """ drop table ${db1}.${tb1} """
+    sql """ drop database ${db1} """
+    sql """ drop database ${db2} """
+
+}