Added compatibility backups

iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/consensus/request/ConfigPhysicalPlan.java

@@ -163,6 +163,10 @@ public ConfigPhysicalPlanType getType() {
     return this.type;
   }
 
+  public short getPlanTypeId() {
+    return type.getPlanType();
+  }
+
   @Override
   public ByteBuffer serializeToByteBuffer() {
     try (final PublicBAOS byteArrayOutputStream = new PublicBAOS();

iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/consensus/request/ConfigPhysicalPlanVisitor.java

@@ -54,7 +54,13 @@
 import org.apache.iotdb.confignode.consensus.request.write.template.ExtendSchemaTemplatePlan;
 
 public abstract class ConfigPhysicalPlanVisitor<R, C> {
+  private final TimechoConfigPhysicalPlanVisitor<R, C> timechoVisitor =
+      new TimechoConfigPhysicalPlanVisitor<>();
+
   public R process(final ConfigPhysicalPlan plan, final C context) {
+    if (isTimechoPlan(plan)) {
+      return timechoVisitor.process(plan, context);
+    }
     switch (plan.getType()) {
       case CreateDatabase:
         return visitCreateDatabase((DatabaseSchemaPlan) plan, context);
@@ -207,6 +213,10 @@ public R process(final ConfigPhysicalPlan plan, final C context) {
     }
   }
 
+  protected boolean isTimechoPlan(final ConfigPhysicalPlan plan) {
+    return plan.getPlanTypeId() < 0;
+  }
+
   /** Top Level Description */
   public abstract R visitPlan(final ConfigPhysicalPlan plan, final C context);
 

iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/consensus/request/TimechoConfigPhysicalPlanVisitor.java

@@ -0,0 +1,34 @@
+/*
+ * 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.confignode.consensus.request;
+
+public class TimechoConfigPhysicalPlanVisitor<R, C> {
+
+  public R process(final ConfigPhysicalPlan plan, final C context) {
+    return visitPlan(plan, context);
+  }
+
+  public R visitPlan(final ConfigPhysicalPlan plan, final C context) {
+    throw new UnsupportedOperationException(
+        String.format(
+            "Timecho config physical plan is not supported in Apache IoTDB: %s",
+            plan.getPlanTypeId()));
+  }
+}

iotdb-core/confignode/src/test/java/org/apache/iotdb/confignode/consensus/request/ConfigPhysicalPlanVisitorTest.java

@@ -0,0 +1,73 @@
+/*
+ * 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.confignode.consensus.request;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+public class ConfigPhysicalPlanVisitorTest {
+
+  @Test
+  public void testNegativePlanTypeIdIsDispatchedToTimechoVisitor() {
+    final boolean[] openSourceVisitorVisited = new boolean[] {false};
+    final ConfigPhysicalPlanVisitor<String, Void> visitor =
+        new ConfigPhysicalPlanVisitor<String, Void>() {
+          @Override
+          public String visitPlan(final ConfigPhysicalPlan plan, final Void context) {
+            openSourceVisitorVisited[0] = true;
+            return "open-source";
+          }
+        };
+
+    try {
+      visitor.process(new NegativePlan(), null);
+      Assert.fail("Expected timecho plan to be dispatched to the placeholder visitor");
+    } catch (final UnsupportedOperationException e) {
+      Assert.assertFalse(openSourceVisitorVisited[0]);
+      Assert.assertTrue(e.getMessage().contains("-1"));
+    }
+  }
+
+  private static class NegativePlan extends ConfigPhysicalPlan {
+
+    private NegativePlan() {
+      super(ConfigPhysicalPlanType.TestOnly);
+    }
+
+    @Override
+    public short getPlanTypeId() {
+      return -1;
+    }
+
+    @Override
+    protected void serializeImpl(final DataOutputStream stream) throws IOException {
+      stream.writeShort(getPlanTypeId());
+    }
+
+    @Override
+    protected void deserializeImpl(final ByteBuffer buffer) throws IOException {
+      // Nothing to deserialize for the test-only placeholder plan.
+    }
+  }
+}