[Improvement](hms catalog) support show_create_database for hms catalog

fe/fe-core/src/main/java/org/apache/doris/datasource/hive/PooledHiveMetaStoreClient.java

@@ -43,6 +43,7 @@
 import org.apache.hadoop.hive.metastore.api.ColumnStatisticsObj;
 import org.apache.hadoop.hive.metastore.api.CurrentNotificationEventId;
 import org.apache.hadoop.hive.metastore.api.DataOperationType;
+import org.apache.hadoop.hive.metastore.api.Database;
 import org.apache.hadoop.hive.metastore.api.FieldSchema;
 import org.apache.hadoop.hive.metastore.api.LockComponent;
 import org.apache.hadoop.hive.metastore.api.LockResponse;
@@ -188,6 +189,19 @@ public List<Partition> getPartitionsByFilter(String dbName, String tblName, Stri
         }
     }
 
+    public Database getDatabase(String dbName) {
+        try (CachedClient client = getClient()) {
+            try {
+                return client.client.getDatabase(dbName);
+            } catch (Exception e) {
+                client.setThrowable(e);
+                throw e;
+            }
+        } catch (Exception e) {
+            throw new HMSClientException("failed to get database %s from hms client", e, dbName);
+        }
+    }
+
     public Table getTable(String dbName, String tblName) {
         try (CachedClient client = getClient()) {
             try {

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

@@ -991,15 +991,28 @@ private void handleShowVariables() throws AnalysisException {
     private void handleShowCreateDb() throws AnalysisException {
         ShowCreateDbStmt showStmt = (ShowCreateDbStmt) stmt;
         List<List<String>> rows = Lists.newArrayList();
-        DatabaseIf db = ctx.getCurrentCatalog().getDbOrAnalysisException(showStmt.getDb());
+
         StringBuilder sb = new StringBuilder();
-        sb.append("CREATE DATABASE `").append(ClusterNamespace.getNameFromFullName(showStmt.getDb())).append("`");
-        if (db.getDbProperties().getProperties().size() > 0) {
-            sb.append("\nPROPERTIES (\n");
-            sb.append(new PrintableMap<>(db.getDbProperties().getProperties(), "=", true, true, false));
-            sb.append("\n)");
+        CatalogIf catalog = ctx.getCurrentCatalog();
+        if (catalog instanceof HMSExternalCatalog) {
+            String simpleDBName = ClusterNamespace.getNameFromFullName(showStmt.getDb());
+            org.apache.hadoop.hive.metastore.api.Database db = ((HMSExternalCatalog) catalog).getClient()
+                    .getDatabase(simpleDBName);
+            sb.append("CREATE DATABASE `").append(simpleDBName).append("`")
+                .append(" LOCATION '")
+                .append(db.getLocationUri())
+                .append("'");
+        } else {
+            DatabaseIf db = catalog.getDbOrAnalysisException(showStmt.getDb());
+            sb.append("CREATE DATABASE `").append(ClusterNamespace.getNameFromFullName(showStmt.getDb())).append("`");
+            if (db.getDbProperties().getProperties().size() > 0) {
+                sb.append("\nPROPERTIES (\n");
+                sb.append(new PrintableMap<>(db.getDbProperties().getProperties(), "=", true, true, false));
+                sb.append("\n)");
+            }
         }
 
+
         rows.add(Lists.newArrayList(ClusterNamespace.getNameFromFullName(showStmt.getDb()), sb.toString()));
         resultSet = new ShowResultSet(showStmt.getMetaData(), rows);
     }

fe/fe-core/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStoreClient.java

@@ -1721,8 +1721,11 @@ public Database getDatabase(String name) throws TException {
 
   @Override
   public Database getDatabase(String catalogName, String databaseName) throws TException {
-    Database d = client.get_database(prependCatalogToDbName(catalogName, databaseName, conf));
-    return deepCopy(filterHook.filterDatabase(d));
+    if (hiveVersion == HiveVersion.V1_0 || hiveVersion == HiveVersion.V2_0 || hiveVersion == HiveVersion.V2_3) {
+      return deepCopy(client.get_database(databaseName));
+    } else {
+      return deepCopy(client.get_database(prependCatalogToDbName(catalogName, databaseName, conf)));
+    }
   }
 
   @Override

regression-test/suites/export_p0/test_show_create_database.groovy

@@ -0,0 +1,46 @@
+// 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_show_create_database", "p0,external,hive,external_docker,external_docker_hive") {
+
+    sql """create database if not exists db_test"""
+    result = sql """show create database db_test"""
+    assertEquals(result.size(), 1)
+    assertEquals(result[0][1], "CREATE DATABASE `db_test`")
+
+    String enabled = context.config.otherConfigs.get("enableHiveTest")
+    if (enabled != null && enabled.equalsIgnoreCase("true")) {
+        String hms_port = context.config.otherConfigs.get("hms_port")
+        String externalEnvIp = context.config.otherConfigs.get("externalEnvIp")
+
+        String catalog_name = "hive_test_other"
+
+        sql """drop catalog if exists ${catalog_name}"""
+        sql """create catalog if not exists ${catalog_name} properties (
+            "type"="hms",
+            'hive.metastore.uris' = 'thrift://${externalEnvIp}:${hms_port}'
+        );"""
+
+        sql """switch ${catalog_name}"""
+
+        result = sql """show create database `default`"""
+        assertEquals(result.size(), 1)
+        assertTrue(result[0][1].contains("CREATE DATABASE `default` LOCATION 'hdfs:"))
+
+        sql """drop catalog if exists ${catalog_name}"""
+    }
+}