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jerryshao pushed a commit to branch main
in repository https://gitbox.apache.org/repos/asf/gravitino.git


The following commit(s) were added to refs/heads/main by this push:
     new b748d734a5 [#14050] fix(jdbc): report non-empty schema drops 
consistently (#14051)
b748d734a5 is described below

commit b748d734a56895a820cd9fee4114064dd17e1339
Author: Qi Yu <[email protected]>
AuthorDate: Wed Oct 21 17:36:05 2026 +0800

    [#14050] fix(jdbc): report non-empty schema drops consistently (#14051)
    
    ### What changes were proposed in this pull request?
    
    Throw `NonEmptySchemaException` when a non-cascading schema drop finds
    tables in JDBC common, Doris, StarRocks and ClickHouse. MySQL and
    OceanBase inherit the shared JDBC fix. Keep the existing SQL and cascade
    behavior.
    
    ### Why are the changes needed?
    
    The schema drop contract and REST error handler expect
    `NonEmptySchemaException`. Throwing generic state/argument exceptions
    currently produces HTTP 500 or 400 for a normal non-empty-schema
    rejection.
    
    Fix: #14050
    
    ### Does this PR introduce _any_ user-facing change?
    
    Affected catalog clients receive `NonEmptySchemaException` and REST
    clients receive HTTP 409 when dropping a non-empty schema without
    cascade, instead of generic errors. No API signatures or configuration
    changes.
    
    ### How was this patch tested?
    
    - Four pre-fix non-empty-drop regression cases failed with the incorrect
    exception types.
    - After the fix: all 438 non-Docker tests in JDBC common, Doris,
    StarRocks and ClickHouse passed, plus all 11 `TestSchemaOperations` REST
    tests (449 total).
    - New coverage checks rejection before DROP, successful empty-schema
    drops, cascade behavior, JDBC resource closure, and the HTTP 409
    response/error type.
    - Module Spotless checks and `git diff --check` passed.
    - Live database/Docker integration tests were not run locally.
---
 .../operations/ClickHouseDatabaseOperations.java   |  7 +-
 .../operations/TestClickHouseDatabaseDrop.java     | 78 ++++++++++++++++++++++
 catalogs/catalog-jdbc-common/build.gradle.kts      |  1 +
 .../jdbc/operation/JdbcDatabaseOperations.java     |  8 +--
 .../jdbc/operation/TestJdbcDatabaseDrop.java       | 70 +++++++++++++++++++
 .../doris/operation/DorisDatabaseOperations.java   |  6 +-
 .../doris/operation/TestDorisDatabaseDrop.java     | 69 +++++++++++++++++++
 catalogs/catalog-jdbc-starrocks/build.gradle.kts   |  1 +
 .../operations/StarRocksDatabaseOperations.java    |  6 +-
 .../operations/TestStarRocksDatabaseDrop.java      | 69 +++++++++++++++++++
 .../server/web/rest/TestSchemaOperations.java      | 21 ++++++
 11 files changed, 322 insertions(+), 14 deletions(-)

diff --git 
a/catalogs-contrib/catalog-jdbc-clickhouse/src/main/java/org/apache/gravitino/catalog/clickhouse/operations/ClickHouseDatabaseOperations.java
 
b/catalogs-contrib/catalog-jdbc-clickhouse/src/main/java/org/apache/gravitino/catalog/clickhouse/operations/ClickHouseDatabaseOperations.java
index 931b4b2c5a..f392172ea1 100644
--- 
a/catalogs-contrib/catalog-jdbc-clickhouse/src/main/java/org/apache/gravitino/catalog/clickhouse/operations/ClickHouseDatabaseOperations.java
+++ 
b/catalogs-contrib/catalog-jdbc-clickhouse/src/main/java/org/apache/gravitino/catalog/clickhouse/operations/ClickHouseDatabaseOperations.java
@@ -43,6 +43,7 @@ import org.apache.gravitino.catalog.jdbc.JdbcSchema;
 import org.apache.gravitino.catalog.jdbc.operation.JdbcDatabaseOperations;
 import org.apache.gravitino.catalog.jdbc.utils.JdbcConnectorUtils;
 import org.apache.gravitino.exceptions.NoSuchSchemaException;
+import org.apache.gravitino.exceptions.NonEmptySchemaException;
 import org.apache.gravitino.meta.AuditInfo;
 
 public class ClickHouseDatabaseOperations extends JdbcDatabaseOperations {
@@ -196,10 +197,8 @@ public class ClickHouseDatabaseOperations extends 
JdbcDatabaseOperations {
           checkStmt.setString(1, databaseName);
           try (ResultSet rs = checkStmt.executeQuery()) {
             if (rs.next()) {
-              throw new IllegalArgumentException(
-                  String.format(
-                      "Database %s is not empty, you can drop it with CASCADE 
option.",
-                      databaseName));
+              throw new NonEmptySchemaException(
+                  "Database %s is not empty, you can drop it with CASCADE 
option.", databaseName);
             }
           }
         }
diff --git 
a/catalogs-contrib/catalog-jdbc-clickhouse/src/test/java/org/apache/gravitino/catalog/clickhouse/operations/TestClickHouseDatabaseDrop.java
 
b/catalogs-contrib/catalog-jdbc-clickhouse/src/test/java/org/apache/gravitino/catalog/clickhouse/operations/TestClickHouseDatabaseDrop.java
new file mode 100644
index 0000000000..a37b94882a
--- /dev/null
+++ 
b/catalogs-contrib/catalog-jdbc-clickhouse/src/test/java/org/apache/gravitino/catalog/clickhouse/operations/TestClickHouseDatabaseDrop.java
@@ -0,0 +1,78 @@
+/*
+ * 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.
+ */
+package org.apache.gravitino.catalog.clickhouse.operations;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.Collections;
+import javax.sql.DataSource;
+import org.apache.gravitino.catalog.jdbc.converter.JdbcExceptionConverter;
+import org.apache.gravitino.exceptions.NonEmptySchemaException;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.mockito.Mockito;
+
+class TestClickHouseDatabaseDrop {
+
+  @ParameterizedTest
+  @CsvSource({"true, false", "false, false", "true, true"})
+  void testDropRespectsNonEmptySchemaContract(boolean nonEmpty, boolean 
cascade) throws Exception {
+    DataSource dataSource = Mockito.mock(DataSource.class);
+    Connection connection = Mockito.mock(Connection.class);
+    PreparedStatement check = Mockito.mock(PreparedStatement.class);
+    PreparedStatement comment = Mockito.mock(PreparedStatement.class);
+    Statement statement = Mockito.mock(Statement.class);
+    ResultSet tables = Mockito.mock(ResultSet.class);
+    ResultSet comments = Mockito.mock(ResultSet.class);
+    String checkSql = "SELECT 1 FROM system.tables WHERE database = ? LIMIT 1";
+    String commentSql = "SELECT comment FROM system.databases WHERE name = ?";
+    Mockito.when(dataSource.getConnection()).thenReturn(connection);
+    Mockito.when(connection.prepareStatement(checkSql)).thenReturn(check);
+    Mockito.when(connection.prepareStatement(commentSql)).thenReturn(comment);
+    Mockito.when(connection.createStatement()).thenReturn(statement);
+    Mockito.when(check.executeQuery()).thenReturn(tables);
+    Mockito.when(comment.executeQuery()).thenReturn(comments);
+    Mockito.when(tables.next()).thenReturn(nonEmpty);
+    ClickHouseDatabaseOperations operations = new 
ClickHouseDatabaseOperations();
+    operations.initialize(dataSource, new JdbcExceptionConverter(), 
Collections.emptyMap());
+
+    if (nonEmpty && !cascade) {
+      NonEmptySchemaException failure =
+          Assertions.assertThrowsExactly(
+              NonEmptySchemaException.class, () -> 
operations.delete("nonempty_schema", false));
+      Assertions.assertTrue(failure.getMessage().contains("nonempty_schema"));
+      Mockito.verify(statement, 
Mockito.never()).executeUpdate(Mockito.anyString());
+      Mockito.verify(connection, Mockito.never()).prepareStatement(commentSql);
+    } else {
+      Assertions.assertTrue(operations.delete("nonempty_schema", cascade));
+      Mockito.verify(statement).executeUpdate("DROP DATABASE 
`nonempty_schema`");
+    }
+    if (cascade) {
+      Mockito.verify(connection, Mockito.never()).prepareStatement(checkSql);
+    } else {
+      Mockito.verify(check).setString(1, "nonempty_schema");
+      Mockito.verify(tables).close();
+      Mockito.verify(check).close();
+    }
+    Mockito.verify(connection).close();
+  }
+}
diff --git a/catalogs/catalog-jdbc-common/build.gradle.kts 
b/catalogs/catalog-jdbc-common/build.gradle.kts
index ce772b8afb..b29ae7786f 100644
--- a/catalogs/catalog-jdbc-common/build.gradle.kts
+++ b/catalogs/catalog-jdbc-common/build.gradle.kts
@@ -65,6 +65,7 @@ dependencies {
   testImplementation(libs.commons.io)
   testImplementation(libs.junit.jupiter.api)
   testImplementation(libs.junit.jupiter.params)
+  testImplementation(libs.mockito.core)
   testImplementation(libs.sqlite.jdbc)
   testImplementation(libs.testcontainers)
   testImplementation(libs.testcontainers.mysql)
diff --git 
a/catalogs/catalog-jdbc-common/src/main/java/org/apache/gravitino/catalog/jdbc/operation/JdbcDatabaseOperations.java
 
b/catalogs/catalog-jdbc-common/src/main/java/org/apache/gravitino/catalog/jdbc/operation/JdbcDatabaseOperations.java
index cf6f89d95a..450cc9e3e3 100644
--- 
a/catalogs/catalog-jdbc-common/src/main/java/org/apache/gravitino/catalog/jdbc/operation/JdbcDatabaseOperations.java
+++ 
b/catalogs/catalog-jdbc-common/src/main/java/org/apache/gravitino/catalog/jdbc/operation/JdbcDatabaseOperations.java
@@ -38,6 +38,7 @@ import org.apache.gravitino.catalog.jdbc.JdbcSchema;
 import org.apache.gravitino.catalog.jdbc.converter.JdbcExceptionConverter;
 import org.apache.gravitino.catalog.jdbc.utils.JdbcConnectorUtils;
 import org.apache.gravitino.exceptions.NoSuchSchemaException;
+import org.apache.gravitino.exceptions.NonEmptySchemaException;
 import org.apache.gravitino.exceptions.SchemaAlreadyExistsException;
 import org.apache.gravitino.meta.AuditInfo;
 import org.slf4j.Logger;
@@ -170,6 +171,7 @@ public abstract class JdbcDatabaseOperations implements 
DatabaseOperation {
    * @param databaseName The name of the database.
    * @param cascade cascade If set to true, drops all the tables in the schema 
as well.
    * @return the SQL statement to drop a database with the given name.
+   * @throws NonEmptySchemaException if the database contains tables and 
cascade is false
    */
   protected String generateDropDatabaseSql(String databaseName, boolean 
cascade) {
     final String dropDatabaseSql = String.format("DROP DATABASE `%s`", 
databaseName);
@@ -183,10 +185,8 @@ public abstract class JdbcDatabaseOperations implements 
DatabaseOperation {
         // Execute the query and check if there exists any tables in the 
database
         try (ResultSet resultSet = statement.executeQuery(query)) {
           if (resultSet.next()) {
-            throw new IllegalStateException(
-                String.format(
-                    "Database %s is not empty, the value of cascade should be 
true.",
-                    databaseName));
+            throw new NonEmptySchemaException(
+                "Database %s is not empty, the value of cascade should be 
true.", databaseName);
           }
         }
       }
diff --git 
a/catalogs/catalog-jdbc-common/src/test/java/org/apache/gravitino/catalog/jdbc/operation/TestJdbcDatabaseDrop.java
 
b/catalogs/catalog-jdbc-common/src/test/java/org/apache/gravitino/catalog/jdbc/operation/TestJdbcDatabaseDrop.java
new file mode 100644
index 0000000000..98032f742b
--- /dev/null
+++ 
b/catalogs/catalog-jdbc-common/src/test/java/org/apache/gravitino/catalog/jdbc/operation/TestJdbcDatabaseDrop.java
@@ -0,0 +1,70 @@
+/*
+ * 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.
+ */
+package org.apache.gravitino.catalog.jdbc.operation;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.Collections;
+import javax.sql.DataSource;
+import org.apache.gravitino.catalog.jdbc.converter.JdbcExceptionConverter;
+import org.apache.gravitino.exceptions.NonEmptySchemaException;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.mockito.Mockito;
+
+class TestJdbcDatabaseDrop {
+
+  @ParameterizedTest
+  @CsvSource({"true, false", "false, false", "true, true"})
+  void testDropRespectsNonEmptySchemaContract(boolean nonEmpty, boolean 
cascade) throws Exception {
+    DataSource dataSource = Mockito.mock(DataSource.class);
+    Connection connection = Mockito.mock(Connection.class);
+    Statement statement = Mockito.mock(Statement.class);
+    ResultSet tables = Mockito.mock(ResultSet.class);
+    Mockito.when(dataSource.getConnection()).thenReturn(connection);
+    Mockito.when(connection.createStatement()).thenReturn(statement);
+    Mockito.when(statement.executeQuery("SHOW TABLES IN 
`nonempty_schema`")).thenReturn(tables);
+    Mockito.when(tables.next()).thenReturn(nonEmpty);
+    JdbcDatabaseOperations operations =
+        Mockito.mock(JdbcDatabaseOperations.class, Mockito.CALLS_REAL_METHODS);
+    operations.initialize(dataSource, new JdbcExceptionConverter(), 
Collections.emptyMap());
+
+    if (nonEmpty && !cascade) {
+      NonEmptySchemaException failure =
+          Assertions.assertThrowsExactly(
+              NonEmptySchemaException.class, () -> 
operations.delete("nonempty_schema", false));
+      Assertions.assertTrue(failure.getMessage().contains("nonempty_schema"));
+      Mockito.verify(statement, 
Mockito.never()).executeUpdate(Mockito.anyString());
+    } else {
+      Assertions.assertTrue(operations.delete("nonempty_schema", cascade));
+      Mockito.verify(statement)
+          .executeUpdate("DROP DATABASE `nonempty_schema`" + (cascade ? "" : 
""));
+    }
+    if (cascade) {
+      Mockito.verify(statement, 
Mockito.never()).executeQuery(Mockito.anyString());
+    } else {
+      Mockito.verify(tables).close();
+    }
+    int connections = !nonEmpty && !cascade ? 2 : 1;
+    Mockito.verify(statement, Mockito.times(connections)).close();
+    Mockito.verify(connection, Mockito.times(connections)).close();
+  }
+}
diff --git 
a/catalogs/catalog-jdbc-doris/src/main/java/org/apache/gravitino/catalog/doris/operation/DorisDatabaseOperations.java
 
b/catalogs/catalog-jdbc-doris/src/main/java/org/apache/gravitino/catalog/doris/operation/DorisDatabaseOperations.java
index 1f0a37c153..1a6fbd2b10 100644
--- 
a/catalogs/catalog-jdbc-doris/src/main/java/org/apache/gravitino/catalog/doris/operation/DorisDatabaseOperations.java
+++ 
b/catalogs/catalog-jdbc-doris/src/main/java/org/apache/gravitino/catalog/doris/operation/DorisDatabaseOperations.java
@@ -34,6 +34,7 @@ import org.apache.gravitino.catalog.jdbc.JdbcSchema;
 import org.apache.gravitino.catalog.jdbc.operation.JdbcDatabaseOperations;
 import org.apache.gravitino.exceptions.NoSuchSchemaException;
 import org.apache.gravitino.exceptions.NoSuchTableException;
+import org.apache.gravitino.exceptions.NonEmptySchemaException;
 import org.apache.gravitino.meta.AuditInfo;
 
 /** Database operations for Apache Doris. */
@@ -76,9 +77,8 @@ public class DorisDatabaseOperations extends 
JdbcDatabaseOperations {
         Statement statement = connection.createStatement();
         ResultSet resultSet = statement.executeQuery(query)) {
       if (resultSet.next()) {
-        throw new IllegalStateException(
-            String.format(
-                "Database %s is not empty, the value of cascade should be 
true.", databaseName));
+        throw new NonEmptySchemaException(
+            "Database %s is not empty, the value of cascade should be true.", 
databaseName);
       }
     } catch (SQLException sqlException) {
       throw this.exceptionMapper.toGravitinoException(sqlException);
diff --git 
a/catalogs/catalog-jdbc-doris/src/test/java/org/apache/gravitino/catalog/doris/operation/TestDorisDatabaseDrop.java
 
b/catalogs/catalog-jdbc-doris/src/test/java/org/apache/gravitino/catalog/doris/operation/TestDorisDatabaseDrop.java
new file mode 100644
index 0000000000..07f3f0c29e
--- /dev/null
+++ 
b/catalogs/catalog-jdbc-doris/src/test/java/org/apache/gravitino/catalog/doris/operation/TestDorisDatabaseDrop.java
@@ -0,0 +1,69 @@
+/*
+ * 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.
+ */
+package org.apache.gravitino.catalog.doris.operation;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.Collections;
+import javax.sql.DataSource;
+import org.apache.gravitino.catalog.jdbc.converter.JdbcExceptionConverter;
+import org.apache.gravitino.exceptions.NonEmptySchemaException;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.mockito.Mockito;
+
+class TestDorisDatabaseDrop {
+
+  @ParameterizedTest
+  @CsvSource({"true, false", "false, false", "true, true"})
+  void testDropRespectsNonEmptySchemaContract(boolean nonEmpty, boolean 
cascade) throws Exception {
+    DataSource dataSource = Mockito.mock(DataSource.class);
+    Connection connection = Mockito.mock(Connection.class);
+    Statement statement = Mockito.mock(Statement.class);
+    ResultSet tables = Mockito.mock(ResultSet.class);
+    Mockito.when(dataSource.getConnection()).thenReturn(connection);
+    Mockito.when(connection.createStatement()).thenReturn(statement);
+    Mockito.when(statement.executeQuery("SHOW TABLES IN 
`nonempty_schema`")).thenReturn(tables);
+    Mockito.when(tables.next()).thenReturn(nonEmpty);
+    DorisDatabaseOperations operations = new DorisDatabaseOperations();
+    operations.initialize(dataSource, new JdbcExceptionConverter(), 
Collections.emptyMap());
+
+    if (nonEmpty && !cascade) {
+      NonEmptySchemaException failure =
+          Assertions.assertThrowsExactly(
+              NonEmptySchemaException.class, () -> 
operations.delete("nonempty_schema", false));
+      Assertions.assertTrue(failure.getMessage().contains("nonempty_schema"));
+      Mockito.verify(statement, 
Mockito.never()).executeUpdate(Mockito.anyString());
+    } else {
+      Assertions.assertTrue(operations.delete("nonempty_schema", cascade));
+      Mockito.verify(statement)
+          .executeUpdate("DROP DATABASE `nonempty_schema`" + (cascade ? " 
FORCE" : ""));
+    }
+    if (cascade) {
+      Mockito.verify(statement, 
Mockito.never()).executeQuery(Mockito.anyString());
+    } else {
+      Mockito.verify(tables).close();
+    }
+    int connections = !nonEmpty && !cascade ? 2 : 1;
+    Mockito.verify(statement, Mockito.times(connections)).close();
+    Mockito.verify(connection, Mockito.times(connections)).close();
+  }
+}
diff --git a/catalogs/catalog-jdbc-starrocks/build.gradle.kts 
b/catalogs/catalog-jdbc-starrocks/build.gradle.kts
index 03b7d260bb..60a45284da 100644
--- a/catalogs/catalog-jdbc-starrocks/build.gradle.kts
+++ b/catalogs/catalog-jdbc-starrocks/build.gradle.kts
@@ -50,6 +50,7 @@ dependencies {
   testImplementation(libs.awaitility)
   testImplementation(libs.junit.jupiter.api)
   testImplementation(libs.junit.jupiter.params)
+  testImplementation(libs.mockito.core)
   testImplementation(libs.mysql.driver)
   testImplementation(libs.postgresql.driver)
   testImplementation(libs.testcontainers)
diff --git 
a/catalogs/catalog-jdbc-starrocks/src/main/java/org/apache/gravitino/catalog/starrocks/operations/StarRocksDatabaseOperations.java
 
b/catalogs/catalog-jdbc-starrocks/src/main/java/org/apache/gravitino/catalog/starrocks/operations/StarRocksDatabaseOperations.java
index 4e7eda3b63..14cfd10859 100644
--- 
a/catalogs/catalog-jdbc-starrocks/src/main/java/org/apache/gravitino/catalog/starrocks/operations/StarRocksDatabaseOperations.java
+++ 
b/catalogs/catalog-jdbc-starrocks/src/main/java/org/apache/gravitino/catalog/starrocks/operations/StarRocksDatabaseOperations.java
@@ -31,6 +31,7 @@ import org.apache.gravitino.catalog.jdbc.JdbcSchema;
 import org.apache.gravitino.catalog.jdbc.operation.JdbcDatabaseOperations;
 import org.apache.gravitino.catalog.starrocks.utils.StarRocksUtils;
 import org.apache.gravitino.exceptions.NoSuchSchemaException;
+import org.apache.gravitino.exceptions.NonEmptySchemaException;
 import org.apache.gravitino.meta.AuditInfo;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -68,9 +69,8 @@ public class StarRocksDatabaseOperations extends 
JdbcDatabaseOperations {
         Statement statement = connection.createStatement();
         ResultSet resultSet = statement.executeQuery(query)) {
       if (resultSet.next()) {
-        throw new IllegalStateException(
-            String.format(
-                "Database %s is not empty, the value of cascade should be 
true.", databaseName));
+        throw new NonEmptySchemaException(
+            "Database %s is not empty, the value of cascade should be true.", 
databaseName);
       }
     } catch (SQLException sqlException) {
       throw this.exceptionMapper.toGravitinoException(sqlException);
diff --git 
a/catalogs/catalog-jdbc-starrocks/src/test/java/org/apache/gravitino/catalog/starrocks/operations/TestStarRocksDatabaseDrop.java
 
b/catalogs/catalog-jdbc-starrocks/src/test/java/org/apache/gravitino/catalog/starrocks/operations/TestStarRocksDatabaseDrop.java
new file mode 100644
index 0000000000..a1ce629ba7
--- /dev/null
+++ 
b/catalogs/catalog-jdbc-starrocks/src/test/java/org/apache/gravitino/catalog/starrocks/operations/TestStarRocksDatabaseDrop.java
@@ -0,0 +1,69 @@
+/*
+ * 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.
+ */
+package org.apache.gravitino.catalog.starrocks.operations;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.Collections;
+import javax.sql.DataSource;
+import org.apache.gravitino.catalog.jdbc.converter.JdbcExceptionConverter;
+import org.apache.gravitino.exceptions.NonEmptySchemaException;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.mockito.Mockito;
+
+class TestStarRocksDatabaseDrop {
+
+  @ParameterizedTest
+  @CsvSource({"true, false", "false, false", "true, true"})
+  void testDropRespectsNonEmptySchemaContract(boolean nonEmpty, boolean 
cascade) throws Exception {
+    DataSource dataSource = Mockito.mock(DataSource.class);
+    Connection connection = Mockito.mock(Connection.class);
+    Statement statement = Mockito.mock(Statement.class);
+    ResultSet tables = Mockito.mock(ResultSet.class);
+    Mockito.when(dataSource.getConnection()).thenReturn(connection);
+    Mockito.when(connection.createStatement()).thenReturn(statement);
+    Mockito.when(statement.executeQuery("SHOW TABLES IN 
`nonempty_schema`")).thenReturn(tables);
+    Mockito.when(tables.next()).thenReturn(nonEmpty);
+    StarRocksDatabaseOperations operations = new StarRocksDatabaseOperations();
+    operations.initialize(dataSource, new JdbcExceptionConverter(), 
Collections.emptyMap());
+
+    if (nonEmpty && !cascade) {
+      NonEmptySchemaException failure =
+          Assertions.assertThrowsExactly(
+              NonEmptySchemaException.class, () -> 
operations.delete("nonempty_schema", false));
+      Assertions.assertTrue(failure.getMessage().contains("nonempty_schema"));
+      Mockito.verify(statement, 
Mockito.never()).executeUpdate(Mockito.anyString());
+    } else {
+      Assertions.assertTrue(operations.delete("nonempty_schema", cascade));
+      Mockito.verify(statement)
+          .executeUpdate("DROP DATABASE `nonempty_schema`" + (cascade ? " 
FORCE" : ""));
+    }
+    if (cascade) {
+      Mockito.verify(statement, 
Mockito.never()).executeQuery(Mockito.anyString());
+    } else {
+      Mockito.verify(tables).close();
+    }
+    int connections = !nonEmpty && !cascade ? 2 : 1;
+    Mockito.verify(statement, Mockito.times(connections)).close();
+    Mockito.verify(connection, Mockito.times(connections)).close();
+  }
+}
diff --git 
a/server/src/test/java/org/apache/gravitino/server/web/rest/TestSchemaOperations.java
 
b/server/src/test/java/org/apache/gravitino/server/web/rest/TestSchemaOperations.java
index 7b7178eb2e..a119612fd2 100644
--- 
a/server/src/test/java/org/apache/gravitino/server/web/rest/TestSchemaOperations.java
+++ 
b/server/src/test/java/org/apache/gravitino/server/web/rest/TestSchemaOperations.java
@@ -457,6 +457,27 @@ public class TestSchemaOperations extends 
BaseOperationsTest {
     Assertions.assertEquals(RuntimeException.class.getSimpleName(), 
errorResp3.getType());
   }
 
+  @Test
+  void testDropNonEmptySchemaWithoutCascadeReturnsConflict() {
+    NameIdentifier identifier = NameIdentifier.of(metalake, catalog, 
"schema1");
+    doThrow(new NonEmptySchemaException("Schema schema1 is not empty"))
+        .when(dispatcher)
+        .dropSchema(identifier, false);
+
+    try (Response response =
+        target("/metalakes/" + metalake + "/catalogs/" + catalog + 
"/schemas/schema1")
+            .queryParam("cascade", false)
+            .request(MediaType.APPLICATION_JSON_TYPE)
+            .accept("application/vnd.gravitino.v1+json")
+            .delete()) {
+      Assertions.assertEquals(Response.Status.CONFLICT.getStatusCode(), 
response.getStatus());
+      ErrorResponse error = response.readEntity(ErrorResponse.class);
+      Assertions.assertEquals(ErrorConstants.NON_EMPTY_CODE, error.getCode());
+      Assertions.assertEquals(NonEmptySchemaException.class.getSimpleName(), 
error.getType());
+      verify(dispatcher).dropSchema(identifier, false);
+    }
+  }
+
   @Test
   public void testDropSchema() {
     when(dispatcher.dropSchema(any(), eq(false))).thenReturn(true);

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