Avoid creating partitioned topic for partition name

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/BrokerService.java

@@ -1882,6 +1882,7 @@ public CompletableFuture<PartitionedTopicMetadata> fetchPartitionedTopicMetadata
                                 // If topic is already exist, creating partitioned topic is not allowed.
                                 if (metadata.partitions == 0
                                         && !topicExists
+                                        && !topicName.isPartitioned()
                                         && pulsar.getBrokerService().isAllowAutoTopicCreation(topicName)
                                         && pulsar.getBrokerService().isDefaultTopicTypePartitioned(topicName)) {
                                     return pulsar.getBrokerService().createDefaultPartitionedTopicAsync(topicName);

pulsar-broker/src/test/java/org/apache/pulsar/broker/admin/TopicAutoCreationTest.java

@@ -0,0 +1,88 @@
+/**
+ * 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.pulsar.broker.admin;
+
+import org.apache.pulsar.client.admin.PulsarAdminException;
+import org.apache.pulsar.client.api.Producer;
+import org.apache.pulsar.client.api.ProducerConsumerBase;
+import org.apache.pulsar.client.api.PulsarClientException;
+import org.junit.Assert;
+import org.testng.annotations.AfterMethod;
+import org.testng.annotations.BeforeMethod;
+import org.testng.annotations.Test;
+
+import java.util.List;
+import java.util.UUID;
+
+public class TopicAutoCreationTest extends ProducerConsumerBase {
+
+    @Override
+    @BeforeMethod
+    protected void setup() throws Exception {
+        conf.setAllowAutoTopicCreationType("partitioned");
+        conf.setAllowAutoTopicCreation(true);
+        conf.setDefaultNumPartitions(3);
+        super.internalSetup();
+        super.producerBaseSetup();
+    }
+
+    @Override
+    @AfterMethod
+    protected void cleanup() throws Exception {
+        super.internalCleanup();
+    }
+
+    @Test
+    public void testPartitionedTopicAutoCreation() throws PulsarAdminException, PulsarClientException {
+        final String namespaceName = "my-property/my-ns";
+        final String topic = "persistent://" + namespaceName + "/test-partitioned-topi-auto-creation-"
+                + UUID.randomUUID().toString();
+
+        Producer<byte[]> producer = pulsarClient.newProducer()
+                .topic(topic)
+                .create();
+
+        List<String> partitionedTopics = admin.topics().getPartitionedTopicList(namespaceName);
+        List<String> topics = admin.topics().getList(namespaceName);
+        Assert.assertEquals(partitionedTopics.size(), 1);
+        Assert.assertEquals(topics.size(), 3);
+
+        producer.close();
+        for (String t : topics) {
+            admin.topics().delete(t);
+        }
+
+        admin.topics().deletePartitionedTopic(topic);
+
+
+        final String partition = "persistent://" + namespaceName + "/test-partitioned-topi-auto-creation-partition-0";
+
+        producer = pulsarClient.newProducer()
+                .topic(partition)
+                .create();
+
+        partitionedTopics = admin.topics().getPartitionedTopicList(namespaceName);
+        topics = admin.topics().getList(namespaceName);
+        Assert.assertEquals(partitionedTopics.size(), 0);
+        Assert.assertEquals(topics.size(), 1);
+
+        producer.close();
+    }
+}