OneSizeFitsQuorum commented on code in PR #12852:
URL: https://github.com/apache/iotdb/pull/12852#discussion_r1668293305


##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/sql/ast/ShowRegions.java:
##########
@@ -0,0 +1,103 @@
+/*
+ * 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.iotdb.db.queryengine.plan.relational.sql.ast;
+
+import org.apache.iotdb.common.rpc.thrift.TConsensusGroupType;
+import org.apache.iotdb.commons.path.PartialPath;
+
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+import java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static java.util.Objects.requireNonNull;
+
+public class ShowRegions extends Statement {
+
+  private final TConsensusGroupType regionType;
+  private final List<PartialPath> storageGroups;
+  private final List<Integer> nodeIds;
+
+  public ShowRegions(
+      TConsensusGroupType regionType, List<PartialPath> storageGroups, 
List<Integer> nodeIds) {
+    super(null);
+    this.regionType = regionType;
+    this.storageGroups = requireNonNull(storageGroups, "storageGroups is 
null");

Review Comment:
   maybe we should  rename it to database



##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/execution/config/executor/ClusterConfigTaskExecutor.java:
##########
@@ -2790,6 +2795,119 @@ public SettableFuture<ConfigTaskResult> 
showDatabases(ShowDB showDB) {
     return future;
   }
 
+  @Override
+  public SettableFuture<ConfigTaskResult> showCluster(ShowCluster showCluster) 
{
+    SettableFuture<ConfigTaskResult> future = SettableFuture.create();
+    TShowClusterResp showClusterResp = new TShowClusterResp();
+    try (ConfigNodeClient client =
+        
CONFIG_NODE_CLIENT_MANAGER.borrowClient(ConfigNodeInfo.CONFIG_REGION_ID)) {
+      showClusterResp = client.showCluster();
+    } catch (ClientManagerException | TException e) {
+      if (showClusterResp.getConfigNodeList() == null) {
+        future.setException(new TException(MSG_RECONNECTION_FAIL));
+      } else {
+        future.setException(e);
+      }
+      return future;
+    }
+    // build TSBlock
+    if (showCluster.getDetails().orElse(false)) {
+      ShowClusterDetailsTask.buildTSBlock(showClusterResp, future);
+    } else {
+      
org.apache.iotdb.db.queryengine.plan.execution.config.metadata.relational.ShowClusterTask

Review Comment:
   can we just use ShowClusterTask?



##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/sql/parser/AstBuilder.java:
##########
@@ -409,23 +416,43 @@ public Node 
visitCountDevicesStatement(RelationalSqlParser.CountDevicesStatement
 
   @Override
   public Node 
visitShowClusterStatement(RelationalSqlParser.ShowClusterStatementContext ctx) {
-    return super.visitShowClusterStatement(ctx);
+    boolean details = ctx.DETAILS() != null;
+    return new ShowCluster(details);
   }
 
   @Override
   public Node 
visitShowRegionsStatement(RelationalSqlParser.ShowRegionsStatementContext ctx) {
-    return super.visitShowRegionsStatement(ctx);
+    TConsensusGroupType regionType = null;
+    if (ctx.DATA() != null) {
+      regionType = TConsensusGroupType.DataRegion;
+    } else if (ctx.SCHEMA() != null) {
+      regionType = TConsensusGroupType.SchemaRegion;
+    }
+    List<PartialPath> storageGroups = new ArrayList<>();

Review Comment:
   database



##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/sql/ast/ShowRegions.java:
##########
@@ -0,0 +1,103 @@
+/*
+ * 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.iotdb.db.queryengine.plan.relational.sql.ast;
+
+import org.apache.iotdb.common.rpc.thrift.TConsensusGroupType;
+import org.apache.iotdb.commons.path.PartialPath;
+
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+import java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static java.util.Objects.requireNonNull;
+
+public class ShowRegions extends Statement {
+
+  private final TConsensusGroupType regionType;
+  private final List<PartialPath> storageGroups;

Review Comment:
   can we just use string as database now?



##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/execution/config/executor/ClusterConfigTaskExecutor.java:
##########
@@ -2790,6 +2795,119 @@ public SettableFuture<ConfigTaskResult> 
showDatabases(ShowDB showDB) {
     return future;
   }
 
+  @Override
+  public SettableFuture<ConfigTaskResult> showCluster(ShowCluster showCluster) 
{
+    SettableFuture<ConfigTaskResult> future = SettableFuture.create();
+    TShowClusterResp showClusterResp = new TShowClusterResp();
+    try (ConfigNodeClient client =
+        
CONFIG_NODE_CLIENT_MANAGER.borrowClient(ConfigNodeInfo.CONFIG_REGION_ID)) {
+      showClusterResp = client.showCluster();
+    } catch (ClientManagerException | TException e) {
+      if (showClusterResp.getConfigNodeList() == null) {
+        future.setException(new TException(MSG_RECONNECTION_FAIL));
+      } else {
+        future.setException(e);
+      }
+      return future;
+    }
+    // build TSBlock
+    if (showCluster.getDetails().orElse(false)) {
+      ShowClusterDetailsTask.buildTSBlock(showClusterResp, future);
+    } else {
+      
org.apache.iotdb.db.queryengine.plan.execution.config.metadata.relational.ShowClusterTask
+          .buildTsBlock(showClusterResp, future);
+    }
+
+    return future;
+  }
+
+  @Override
+  public SettableFuture<ConfigTaskResult> showRegions(ShowRegions showRegions) 
{
+    SettableFuture<ConfigTaskResult> future = SettableFuture.create();
+    TShowRegionResp showRegionResp = new TShowRegionResp();
+    TShowRegionReq showRegionReq = new TShowRegionReq();
+    showRegionReq.setConsensusGroupType(showRegions.getRegionType());
+    if ((showRegions.getStorageGroups() == null) || 
showRegions.getStorageGroups().isEmpty()) {

Review Comment:
   maybe we can rename storageGroup to database



##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/execution/config/executor/ClusterConfigTaskExecutor.java:
##########
@@ -2790,6 +2795,119 @@ public SettableFuture<ConfigTaskResult> 
showDatabases(ShowDB showDB) {
     return future;
   }
 
+  @Override
+  public SettableFuture<ConfigTaskResult> showCluster(ShowCluster showCluster) 
{
+    SettableFuture<ConfigTaskResult> future = SettableFuture.create();
+    TShowClusterResp showClusterResp = new TShowClusterResp();
+    try (ConfigNodeClient client =
+        
CONFIG_NODE_CLIENT_MANAGER.borrowClient(ConfigNodeInfo.CONFIG_REGION_ID)) {
+      showClusterResp = client.showCluster();
+    } catch (ClientManagerException | TException e) {
+      if (showClusterResp.getConfigNodeList() == null) {
+        future.setException(new TException(MSG_RECONNECTION_FAIL));
+      } else {
+        future.setException(e);
+      }
+      return future;
+    }
+    // build TSBlock
+    if (showCluster.getDetails().orElse(false)) {
+      ShowClusterDetailsTask.buildTSBlock(showClusterResp, future);
+    } else {
+      
org.apache.iotdb.db.queryengine.plan.execution.config.metadata.relational.ShowClusterTask
+          .buildTsBlock(showClusterResp, future);
+    }
+
+    return future;
+  }
+
+  @Override
+  public SettableFuture<ConfigTaskResult> showRegions(ShowRegions showRegions) 
{
+    SettableFuture<ConfigTaskResult> future = SettableFuture.create();
+    TShowRegionResp showRegionResp = new TShowRegionResp();
+    TShowRegionReq showRegionReq = new TShowRegionReq();
+    showRegionReq.setConsensusGroupType(showRegions.getRegionType());
+    if ((showRegions.getStorageGroups() == null) || 
showRegions.getStorageGroups().isEmpty()) {
+      showRegionReq.setDatabases(null);
+    } else {
+      showRegionReq.setDatabases(
+          showRegions.getStorageGroups().stream()
+              .map(PartialPath::getFullPath)
+              .collect(Collectors.toList()));
+    }
+    try (ConfigNodeClient client =
+        
CONFIG_NODE_CLIENT_MANAGER.borrowClient(ConfigNodeInfo.CONFIG_REGION_ID)) {
+      showRegionResp = client.showRegion(showRegionReq);
+      if (showRegionResp.getStatus().getCode() != 
TSStatusCode.SUCCESS_STATUS.getStatusCode()) {
+        future.setException(
+            new IoTDBException(
+                showRegionResp.getStatus().message, 
showRegionResp.getStatus().code));
+        return future;
+      }
+    } catch (ClientManagerException | TException e) {
+      future.setException(e);
+    }
+
+    // filter the regions by nodeId
+    // TODO: This part currently will remain empty as we're ot implementing 
any other filtering
+    // methods right now.
+    if ((showRegions.getNodeIds() != null) && 
!showRegions.getNodeIds().isEmpty()) {

Review Comment:
   redundant ()?



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