Copilot commented on code in PR #11066:
URL: https://github.com/apache/gravitino/pull/11066#discussion_r3232718013


##########
plugins/idp-basic/build.gradle.kts:
##########
@@ -24,10 +24,29 @@ plugins {
 }
 
 dependencies {
+  implementation(project(":core"))
   implementation(libs.bcprov.jdk18on)
   implementation(libs.commons.lang3)
   implementation(libs.guava)
+  implementation(libs.mybatis)
+  testImplementation(project(":api"))
+  testImplementation(project(":clients:client-java"))
+  testImplementation(project(":common"))
+  testImplementation(project(":lance:lance-common")) {
+    exclude("*")

Review Comment:
   `exclude(\"*\")` is not a valid Gradle Kotlin DSL exclude signature and is 
likely to fail the build script compilation. If the goal is to avoid pulling 
any transitive dependencies from `:lance:lance-common`, configure the 
dependency as non-transitive (e.g., `isTransitive = false`) or replace this 
with explicit `exclude(group = ..., module = ...)` entries for the specific 
transitive modules that need to be removed.
   



##########
plugins/idp-basic/src/test/java/org/apache/gravitino/storage/relational/BackendTestExtension.java:
##########
@@ -0,0 +1,164 @@
+/*
+ * 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.storage.relational;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.sql.SQLException;
+import java.util.Comparator;
+import java.util.List;
+import java.util.stream.Stream;
+import org.apache.gravitino.Config;
+import org.apache.gravitino.Configs;
+import org.apache.gravitino.integration.test.util.BaseIT;
+import org.apache.gravitino.storage.relational.session.SqlSessionFactoryHelper;
+import org.junit.jupiter.api.extension.AfterEachCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.Extension;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContext;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
+
+class BackendTestExtension implements TestTemplateInvocationContextProvider {
+  private static final String DOCKER_TEST_FLAG = "dockerTest";
+
+  @Override
+  public boolean supportsTestTemplate(ExtensionContext context) {
+    return true;
+  }
+
+  @Override
+  public Stream<TestTemplateInvocationContext> 
provideTestTemplateInvocationContexts(
+      ExtensionContext context) {
+    List<String> backends =
+        "true".equalsIgnoreCase(System.getenv(DOCKER_TEST_FLAG))
+            ? List.of("h2", "mysql", "postgresql")
+            : List.of("h2");
+    return backends.stream().map(BackendInvocationContext::new);
+  }

Review Comment:
   The PR description says to enable multi-database execution by setting 
`dockerTest=true`, but the extension checks an environment variable via 
`System.getenv(\"dockerTest\")`. In typical Gradle usage, `-PdockerTest=true` 
(project property) or `-DdockerTest=true` (system property) are more common 
than exporting an env var; consider also checking 
`System.getProperty(\"dockerTest\")` (and/or a Gradle-provided system property) 
or update the documentation to explicitly require an environment variable.



##########
plugins/idp-basic/src/main/java/org/apache/gravitino/storage/relational/mapper/IdpUserMetaSQLProviderFactory.java:
##########
@@ -0,0 +1,85 @@
+/*
+ * 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.storage.relational.mapper;
+
+import com.google.common.collect.ImmutableMap;
+import java.util.List;
+import java.util.Map;
+import org.apache.gravitino.storage.relational.JDBCBackend.JDBCBackendType;
+import 
org.apache.gravitino.storage.relational.mapper.provider.base.IdpUserMetaBaseSQLProvider;
+import 
org.apache.gravitino.storage.relational.mapper.provider.h2.IdpUserMetaH2Provider;
+import 
org.apache.gravitino.storage.relational.mapper.provider.postgresql.IdpUserMetaPostgreSQLProvider;
+import org.apache.gravitino.storage.relational.po.IdpUserPO;
+import org.apache.gravitino.storage.relational.session.SqlSessionFactoryHelper;
+import org.apache.ibatis.annotations.Param;
+
+public class IdpUserMetaSQLProviderFactory {
+  private static final Map<JDBCBackendType, IdpUserMetaBaseSQLProvider>
+      IDP_USER_META_SQL_PROVIDER_MAP =
+          ImmutableMap.of(
+              JDBCBackendType.MYSQL, new IdpUserMetaMySQLProvider(),
+              JDBCBackendType.H2, new IdpUserMetaH2Provider(),
+              JDBCBackendType.POSTGRESQL, new IdpUserMetaPostgreSQLProvider());
+
+  public static IdpUserMetaBaseSQLProvider getProvider() {
+    String databaseId =
+        SqlSessionFactoryHelper.getInstance()
+            .getSqlSessionFactory()
+            .getConfiguration()
+            .getDatabaseId();
+
+    JDBCBackendType jdbcBackendType = JDBCBackendType.fromString(databaseId);
+    return IDP_USER_META_SQL_PROVIDER_MAP.get(jdbcBackendType);

Review Comment:
   `getProvider()` may return `null` if `databaseId` is missing/unknown or if 
the backend type is not present in `IDP_USER_META_SQL_PROVIDER_MAP`, which can 
surface later as a confusing `NullPointerException` during SQL generation. 
Prefer failing fast here with a clear exception message (e.g., throw 
`IllegalStateException` when the provider is not found) so misconfiguration is 
easier to diagnose.
   



##########
plugins/idp-basic/src/main/java/org/apache/gravitino/storage/relational/mapper/provider/postgresql/IdpUserMetaPostgreSQLProvider.java:
##########
@@ -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.
+ */
+
+package org.apache.gravitino.storage.relational.mapper.provider.postgresql;
+
+import org.apache.gravitino.storage.relational.mapper.IdpUserMetaMapper;
+import 
org.apache.gravitino.storage.relational.mapper.provider.base.IdpUserMetaBaseSQLProvider;
+import org.apache.ibatis.annotations.Param;
+
+public class IdpUserMetaPostgreSQLProvider extends IdpUserMetaBaseSQLProvider {
+
+  @Override
+  public String softDeleteIdpUser(Long userId) {
+    return "UPDATE "
+        + IdpUserMetaMapper.IDP_USER_TABLE_NAME
+        + " SET deleted_at = CAST(EXTRACT(EPOCH FROM CURRENT_TIMESTAMP) * 1000 
AS BIGINT),"
+        + " current_version = current_version + 1,"
+        + " last_version = last_version + 1"
+        + " WHERE user_id = #{userId} AND deleted_at = 0";
+  }
+
+  @Override
+  public String deleteIdpUserMetasByLegacyTimeline(Long legacyTimeline, 
@Param("limit") int limit) {
+    return "DELETE FROM "
+        + IdpUserMetaMapper.IDP_USER_TABLE_NAME
+        + " WHERE user_id IN (SELECT user_id FROM "
+        + IdpUserMetaMapper.IDP_USER_TABLE_NAME
+        + " WHERE deleted_at > 0 AND deleted_at < #{legacyTimeline} LIMIT 
#{limit})";

Review Comment:
   The PostgreSQL cleanup query applies `LIMIT` without an `ORDER BY`, which 
makes the subset of rows deleted non-deterministic across executions and query 
plans. If stable batching is important (e.g., to ensure oldest-deleted users 
are cleaned first), add an explicit ordering inside the subquery (typically by 
`deleted_at` and then `user_id`) before applying the limit.
   



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