Fix bug using null as measurement name

integration-test/src/test/java/org/apache/iotdb/session/it/IoTDBSessionSyntaxConventionIT.java

@@ -18,13 +18,17 @@
  */
 package org.apache.iotdb.session.it;
 
+import org.apache.iotdb.db.protocol.thrift.OperationType;
 import org.apache.iotdb.isession.ISession;
 import org.apache.iotdb.isession.SessionDataSet;
+import org.apache.iotdb.isession.template.Template;
 import org.apache.iotdb.it.env.EnvFactory;
 import org.apache.iotdb.it.framework.IoTDBTestRunner;
 import org.apache.iotdb.itbase.category.ClusterIT;
 import org.apache.iotdb.itbase.category.LocalStandaloneIT;
 import org.apache.iotdb.rpc.StatementExecutionException;
+import org.apache.iotdb.rpc.TSStatusCode;
+import org.apache.iotdb.session.template.MeasurementNode;
 import org.apache.iotdb.tsfile.file.metadata.enums.CompressionType;
 import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
 import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
@@ -44,6 +48,7 @@
 import java.util.Collections;
 import java.util.List;
 
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
@@ -428,4 +433,33 @@ public void createSchemaTemplateWithIllegalMeasurementTest() {
       fail(e.getMessage());
     }
   }
+
+  @Test
+  public void createSchemaTemplateWithIllegalMeasurementNameTest() {
+    try (ISession session = EnvFactory.getEnv().getSessionConnection()) {
+
+      Template template = new Template("null_t", true);
+      MeasurementNode mNode =
+          new MeasurementNode(null, TSDataType.FLOAT, TSEncoding.GORILLA, CompressionType.LZ4);
+      template.addToTemplate(mNode);
+
+      try {
+        session.createSchemaTemplate(template);
+        fail();
+      } catch (StatementExecutionException e) {
+        TSStatusCode statusCode =
+            TSStatusCode.representOf(TSStatusCode.METADATA_ERROR.getStatusCode());
+        String message =
+            String.format(
+                "[%s] Exception occurred: %s failed. %s",
+                statusCode,
+                OperationType.CREATE_SCHEMA_TEMPLATE,
+                "The name of a measurement in schema template shall not be null.");
+        assertEquals(TSStatusCode.METADATA_ERROR.getStatusCode() + ": " + message, e.getMessage());
+      }
+    } catch (Exception e) {
+      e.printStackTrace();
+      fail(e.getMessage());
+    }
+  }
 }

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/parser/StatementGenerator.java

@@ -640,6 +640,11 @@ public static CreateSchemaTemplateStatement createStatement(TSCreateSchemaTempla
       CompressionType compressionType =
           CompressionType.deserialize(ReadWriteIOUtils.readByte(buffer));
 
+      if (measurementName == null) {
+        throw new MetadataException(
+            "The name of a measurement in schema template shall not be null.");
+      }
+
       if (alignedPrefix.containsKey(prefix) && !isAlign) {
         throw new MetadataException("Align designation incorrect at: " + prefix);
       }