Copilot commented on code in PR #18876:
URL: https://github.com/apache/pinot/pull/18876#discussion_r3801898720


##########
pinot-integration-tests/src/test/java/org/apache/pinot/integration/tests/custom/UuidUpsertRealtimeTest.java:
##########
@@ -0,0 +1,134 @@
+/**
+ * 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.pinot.integration.tests.custom;
+
+import java.io.File;
+import java.nio.ByteBuffer;
+import java.time.Duration;
+import java.util.List;
+import org.apache.avro.Schema.Field;
+import org.apache.avro.Schema.Type;
+import org.apache.avro.file.DataFileWriter;
+import org.apache.avro.generic.GenericData;
+import org.apache.pinot.client.ResultSet;
+import org.apache.pinot.spi.config.table.TableConfig;
+import org.apache.pinot.spi.data.FieldSpec.DataType;
+import org.apache.pinot.spi.data.Schema;
+import org.apache.pinot.spi.utils.UuidUtils;
+import org.apache.pinot.util.TestUtils;
+import org.testng.annotations.Test;
+
+import static org.apache.avro.Schema.create;
+import static org.testng.Assert.assertEquals;
+
+
+/// Verifies realtime UUID ingestion and full-upsert deduplication with a UUID 
primary key.

Review Comment:
   Java single-line comments conventionally use `//` (or `/** ... */` for 
class-level Javadoc). Using `///` is legal but atypical and can be confusing 
for readers and tooling. Consider switching to `//` (or Javadoc if you want it 
surfaced in generated docs).



##########
pinot-integration-tests/src/test/java/org/apache/pinot/integration/tests/custom/UuidUpsertRealtimeTest.java:
##########
@@ -0,0 +1,134 @@
+/**
+ * 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.pinot.integration.tests.custom;
+
+import java.io.File;
+import java.nio.ByteBuffer;
+import java.time.Duration;
+import java.util.List;
+import org.apache.avro.Schema.Field;
+import org.apache.avro.Schema.Type;
+import org.apache.avro.file.DataFileWriter;
+import org.apache.avro.generic.GenericData;
+import org.apache.pinot.client.ResultSet;
+import org.apache.pinot.spi.config.table.TableConfig;
+import org.apache.pinot.spi.data.FieldSpec.DataType;
+import org.apache.pinot.spi.data.Schema;
+import org.apache.pinot.spi.utils.UuidUtils;
+import org.apache.pinot.util.TestUtils;
+import org.testng.annotations.Test;
+
+import static org.apache.avro.Schema.create;
+import static org.testng.Assert.assertEquals;
+
+
+/// Verifies realtime UUID ingestion and full-upsert deduplication with a UUID 
primary key.
+@Test(suiteName = "CustomClusterIntegrationTest")
+public class UuidUpsertRealtimeTest extends 
CustomDataQueryClusterIntegrationTest {
+  private static final String TABLE_NAME = "UuidUpsertRealtimeTest";
+  private static final String UUID_PK_COLUMN = "uuidPk";
+  private static final long BASE_TIME_MS = 1_700_100_000_000L;
+  private static final List<String> UUID_PK_VALUES = List.of(
+      "550e8400-e29b-41d4-a716-446655440000",
+      "550e8400-e29b-41d4-a716-446655440001",
+      "550e8400-e29b-41d4-a716-446655440000");
+
+  @Override
+  public String getTableName() {
+    return TABLE_NAME;
+  }
+
+  @Override
+  public boolean isRealtimeTable() {
+    return true;
+  }
+
+  @Override
+  protected int getNumKafkaPartitions() {
+    return 1;
+  }
+
+  @Override
+  protected void waitForAllDocsLoaded(long timeoutMs) {
+    TestUtils.waitForCondition(() -> getPinotConnection().execute(
+            "SELECT COUNT(*) FROM " + TABLE_NAME + " 
OPTION(skipUpsert=true)").getResultSet(0).getLong(0)
+            == UUID_PK_VALUES.size(),
+        100L, timeoutMs, "Failed to load all UUID upsert records", 
Duration.ofSeconds(5));
+  }
+
+  @Override
+  public int getNumAvroFiles() {
+    return 1;
+  }
+
+  @Override
+  protected int getRealtimeSegmentFlushSize() {
+    return 2;
+  }
+
+  @Override
+  protected TableConfig createRealtimeTableConfig(File sampleAvroFile) {
+    return createUpsertTableConfig(sampleAvroFile, UUID_PK_COLUMN, null, 
getNumKafkaPartitions());

Review Comment:
   The test asserts 'later duplicate wins' using the event timestamp, but the 
upsert table config passes `null` for the comparison column. If the underlying 
upsert behavior is based on ingestion order/offset (or another implicit 
comparator), this can make the winner selection less deterministic and 
potentially flaky across environments. Prefer setting the comparison column to 
`getTimeColumnName()` (and keeping the produced timestamps increasing) so the 
test’s expected winner is explicitly enforced by config.



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