Copilot commented on code in PR #11140:
URL: https://github.com/apache/gravitino/pull/11140#discussion_r3263320140


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plugins/idp-basic/src/main/java/org/apache/gravitino/idp/storage/mapper/provider/base/IdpGroupUserRelBaseSQLProvider.java:
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@@ -0,0 +1,147 @@
+/*
+ * 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.idp.storage.mapper.provider.base;
+
+import java.util.List;
+import org.apache.gravitino.idp.storage.mapper.IdpGroupMetaMapper;
+import org.apache.gravitino.idp.storage.mapper.IdpGroupUserRelMapper;
+import org.apache.gravitino.idp.storage.mapper.IdpUserMetaMapper;
+import org.apache.gravitino.idp.storage.po.IdpGroupUserRelPO;
+import org.apache.ibatis.annotations.Param;
+
+public class IdpGroupUserRelBaseSQLProvider {
+
+  public String selectGroupNamesByUserId(@Param("userId") Long userId) {
+    return "SELECT g.group_name"
+        + " FROM "
+        + IdpGroupUserRelMapper.IDP_GROUP_USER_REL_TABLE_NAME
+        + " r JOIN "
+        + IdpGroupMetaMapper.IDP_GROUP_TABLE_NAME
+        + " g ON g.group_id = r.group_id"
+        + " WHERE r.user_id = #{userId}"
+        + " AND r.deleted_at = 0"
+        + " AND g.deleted_at = 0"
+        + " ORDER BY g.group_name";
+  }
+
+  public String selectUserNamesByGroupId(@Param("groupId") Long groupId) {
+    return "SELECT u.user_name"
+        + " FROM "
+        + IdpGroupUserRelMapper.IDP_GROUP_USER_REL_TABLE_NAME
+        + " r JOIN "
+        + IdpUserMetaMapper.IDP_USER_TABLE_NAME
+        + " u ON u.user_id = r.user_id"
+        + " WHERE r.group_id = #{groupId}"
+        + " AND r.deleted_at = 0"
+        + " AND u.deleted_at = 0"
+        + " ORDER BY u.user_name";
+  }
+
+  public String selectRelatedUserIds(
+      @Param("groupId") Long groupId, @Param("userIds") List<Long> userIds) {
+    return "<script>"
+        + "SELECT user_id"
+        + " FROM "
+        + IdpGroupUserRelMapper.IDP_GROUP_USER_REL_TABLE_NAME
+        + " WHERE group_id = #{groupId} "
+        + "<choose>"
+        + "<when test='userIds != null and userIds.size() > 0'>"
+        + "AND user_id IN ("
+        + "<foreach collection='userIds' item='userId' separator=','>"
+        + "#{userId}"
+        + "</foreach>"
+        + ") "
+        + "</when>"
+        + "<otherwise>"
+        + "AND 1 = 0 "
+        + "</otherwise>"
+        + "</choose>"
+        + "AND deleted_at = 0"
+        + "</script>";
+  }
+
+  public String batchInsertIdpGroupUsers(@Param("relations") 
List<IdpGroupUserRelPO> relations) {
+    return "<script>"
+        + "INSERT INTO "
+        + IdpGroupUserRelMapper.IDP_GROUP_USER_REL_TABLE_NAME
+        + " (id, group_id, user_id, current_version, last_version, deleted_at)"
+        + " VALUES "
+        + "<foreach item='item' collection='relations' separator=','>"
+        + "(#{item.id}, #{item.groupId}, #{item.userId}, 
#{item.currentVersion},"
+        + " #{item.lastVersion}, #{item.deletedAt})"
+        + "</foreach>"
+        + "</script>";
+  }
+
+  public String softDeleteIdpGroupUsers(
+      @Param("groupId") Long groupId, @Param("userIds") List<Long> userIds) {
+    return "<script>"
+        + "UPDATE "
+        + IdpGroupUserRelMapper.IDP_GROUP_USER_REL_TABLE_NAME
+        + softDeleteSetClause()
+        + " WHERE group_id = #{groupId} "
+        + "<choose>"
+        + "<when test='userIds != null and userIds.size() > 0'>"
+        + "AND user_id IN ("
+        + "<foreach collection='userIds' item='userId' separator=','>"
+        + "#{userId}"
+        + "</foreach>"
+        + ") "
+        + "</when>"
+        + "<otherwise>"
+        + "AND 1 = 0 "
+        + "</otherwise>"
+        + "</choose>"
+        + "AND deleted_at = 0"
+        + "</script>";
+  }
+
+  public String softDeleteGroupUsersByUserId(@Param("userId") Long userId) {
+    return "UPDATE "
+        + IdpGroupUserRelMapper.IDP_GROUP_USER_REL_TABLE_NAME
+        + softDeleteSetClause()
+        + " WHERE user_id = #{userId} AND deleted_at = 0";
+  }
+
+  public String softDeleteGroupUsersByGroupId(@Param("groupId") Long groupId) {
+    return "UPDATE "
+        + IdpGroupUserRelMapper.IDP_GROUP_USER_REL_TABLE_NAME
+        + softDeleteSetClause()
+        + " WHERE group_id = #{groupId} AND deleted_at = 0";
+  }
+
+  public String deleteIdpGroupUserRelMetasByLegacyTimeline(
+      @Param("legacyTimeline") Long legacyTimeline, @Param("limit") int limit) 
{
+    return "DELETE FROM "
+        + IdpGroupUserRelMapper.IDP_GROUP_USER_REL_TABLE_NAME
+        + " WHERE deleted_at > 0 AND deleted_at < #{legacyTimeline} LIMIT 
#{limit}";
+  }
+
+  protected String softDeleteSetClause() {
+    return " SET deleted_at = "
+        + currentTimeMillisExpression()
+        + ", current_version = current_version + 1,"
+        + " last_version = last_version + 1";
+  }
+
+  protected String currentTimeMillisExpression() {
+    return "(UNIX_TIMESTAMP() * 1000.0)";

Review Comment:
   Multiplying by `1000.0` makes this expression evaluate to a DOUBLE/DECIMAL, 
but it is used to populate the `deleted_at` column which is a 
BIGINT/epoch-millis value (the H2 and PostgreSQL overrides correctly return 
integer milliseconds). Under MySQL this can store a non-integer timestamp and 
lose precision/cause comparison oddities against the integer `deleted_at` 
values used elsewhere (e.g., `deleted_at < #{legacyTimeline}`). Consider using 
`(UNIX_TIMESTAMP(CURRENT_TIMESTAMP(3)) * 1000)` or `CAST(UNIX_TIMESTAMP() * 
1000 AS UNSIGNED)` so the result is an integer milliseconds value.
   



##########
plugins/idp-basic/src/main/java/org/apache/gravitino/idp/storage/mapper/IdpGroupUserRelSQLProviderFactory.java:
##########
@@ -0,0 +1,94 @@
+/*
+ * 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.idp.storage.mapper;
+
+import com.google.common.collect.ImmutableMap;
+import java.util.List;
+import java.util.Map;
+import 
org.apache.gravitino.idp.storage.mapper.provider.base.IdpGroupUserRelBaseSQLProvider;
+import 
org.apache.gravitino.idp.storage.mapper.provider.h2.IdpGroupUserRelH2Provider;
+import 
org.apache.gravitino.idp.storage.mapper.provider.postgresql.IdpGroupUserRelPostgreSQLProvider;
+import org.apache.gravitino.idp.storage.po.IdpGroupUserRelPO;
+import org.apache.gravitino.storage.relational.JDBCBackend.JDBCBackendType;
+import org.apache.ibatis.annotations.Param;
+
+public class IdpGroupUserRelSQLProviderFactory {
+  private static final IdpGroupUserRelBaseSQLProvider MYSQL_PROVIDER =
+      new IdpGroupUserRelBaseSQLProvider();
+  private static final IdpGroupUserRelBaseSQLProvider H2_PROVIDER = new 
IdpGroupUserRelH2Provider();
+  private static final IdpGroupUserRelBaseSQLProvider POSTGRESQL_PROVIDER =
+      new IdpGroupUserRelPostgreSQLProvider();
+  private static final Map<JDBCBackendType, IdpGroupUserRelBaseSQLProvider> 
PROVIDER_MAP =
+      ImmutableMap.of(
+          JDBCBackendType.MYSQL,
+          MYSQL_PROVIDER,
+          JDBCBackendType.H2,
+          H2_PROVIDER,
+          JDBCBackendType.POSTGRESQL,
+          POSTGRESQL_PROVIDER);
+
+  private IdpGroupUserRelSQLProviderFactory() {}
+
+  private static IdpGroupUserRelBaseSQLProvider currentProvider() {
+    return SQLProviderFactoryHelper.currentProvider(
+        PROVIDER_MAP, IdpGroupUserRelSQLProviderFactory.class);
+  }
+
+  static IdpGroupUserRelBaseSQLProvider getProvider(String databaseId) {
+    return SQLProviderFactoryHelper.getProvider(
+        databaseId, PROVIDER_MAP, IdpGroupUserRelSQLProviderFactory.class);
+  }
+
+  public static String selectGroupNamesByUserId(@Param("userId") Long userId) {
+    return currentProvider().selectGroupNamesByUserId(userId);
+  }
+
+  public static String selectUserNamesByGroupId(@Param("groupId") Long 
groupId) {
+    return currentProvider().selectUserNamesByGroupId(groupId);
+  }
+
+  public static String selectRelatedUserIds(
+      @Param("groupId") Long groupId, @Param("userIds") List<Long> userIds) {
+    return currentProvider().selectRelatedUserIds(groupId, userIds);
+  }
+
+  public static String batchInsertIdpGroupUsers(
+      @Param("relations") List<IdpGroupUserRelPO> relations) {
+    return currentProvider().batchInsertIdpGroupUsers(relations);
+  }
+
+  public static String softDeleteIdpGroupUsers(
+      @Param("groupId") Long groupId, @Param("userIds") List<Long> userIds) {
+    return currentProvider().softDeleteIdpGroupUsers(groupId, userIds);
+  }
+
+  public static String softDeleteGroupUsersByUserId(@Param("userId") Long 
userId) {
+    return currentProvider().softDeleteGroupUsersByUserId(userId);
+  }
+
+  public static String softDeleteGroupUsersByGroupId(@Param("groupId") Long 
groupId) {
+    return currentProvider().softDeleteGroupUsersByGroupId(groupId);
+  }

Review Comment:
   `@Param` annotations are only meaningful on MyBatis mapper interface 
methods; on these static provider-factory methods they have no effect and can 
mislead readers into thinking MyBatis is binding parameters here. Consider 
removing the `@Param` annotations from this factory class (and similarly from 
the base/PostgreSQL provider classes) and keeping them only on the 
`IdpGroupUserRelMapper` interface, where they actually drive parameter binding.



##########
plugins/idp-basic/src/main/java/org/apache/gravitino/idp/storage/mapper/IdpGroupUserRelMapper.java:
##########
@@ -0,0 +1,81 @@
+/*
+ * 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.idp.storage.mapper;
+
+import java.util.List;
+import org.apache.gravitino.idp.storage.po.IdpGroupUserRelPO;
+import org.apache.ibatis.annotations.DeleteProvider;
+import org.apache.ibatis.annotations.InsertProvider;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.SelectProvider;
+import org.apache.ibatis.annotations.UpdateProvider;
+
+/**
+ * A MyBatis mapper for built-in IdP group-user relation operations.
+ *
+ * <p>This interface defines the SQL statements MyBatis executes for the 
built-in IdP group-user
+ * relation store. The SQLs are provided through {@code *Provider} annotations 
on this mapper
+ * interface. See the <a 
href="https://mybatis.org/mybatis-3/getting-started.html";>MyBatis getting
+ * started guide</a>.
+ */
+public interface IdpGroupUserRelMapper {
+  String IDP_GROUP_USER_REL_TABLE_NAME = "idp_group_user_rel";
+
+  @SelectProvider(
+      type = IdpGroupUserRelSQLProviderFactory.class,
+      method = "selectGroupNamesByUserId")
+  List<String> selectGroupNamesByUserId(@Param("userId") Long userId);
+
+  @SelectProvider(
+      type = IdpGroupUserRelSQLProviderFactory.class,
+      method = "selectUserNamesByGroupId")
+  List<String> selectUserNamesByGroupId(@Param("groupId") Long groupId);
+
+  @SelectProvider(type = IdpGroupUserRelSQLProviderFactory.class, method = 
"selectRelatedUserIds")
+  List<Long> selectRelatedUserIds(
+      @Param("groupId") Long groupId, @Param("userIds") List<Long> userIds);
+
+  @InsertProvider(
+      type = IdpGroupUserRelSQLProviderFactory.class,
+      method = "batchInsertIdpGroupUsers")
+  void batchInsertIdpGroupUsers(@Param("relations") List<IdpGroupUserRelPO> 
relations);
+
+  @UpdateProvider(
+      type = IdpGroupUserRelSQLProviderFactory.class,
+      method = "softDeleteIdpGroupUsers")
+  void softDeleteIdpGroupUsers(
+      @Param("groupId") Long groupId, @Param("userIds") List<Long> userIds);
+
+  @UpdateProvider(
+      type = IdpGroupUserRelSQLProviderFactory.class,
+      method = "softDeleteGroupUsersByUserId")
+  void softDeleteGroupUsersByUserId(@Param("userId") Long userId);
+
+  @UpdateProvider(
+      type = IdpGroupUserRelSQLProviderFactory.class,
+      method = "softDeleteGroupUsersByGroupId")
+  void softDeleteGroupUsersByGroupId(@Param("groupId") Long groupId);

Review Comment:
   These soft-delete methods return `void`, while 
`deleteIdpGroupUserRelMetasByLegacyTimeline` returns `Integer`. Callers will 
frequently want to know whether any rows were actually updated (e.g., to 
short-circuit, log, or verify idempotency). Consider returning `Integer`/`int` 
(the number of affected rows) from the soft-delete methods for consistency and 
to give callers useful information.
   



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