Merge branch 'main' into add-picosecond-ITs-3

Author: lqiu96

google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1/it/ITBigQueryStorageWriteClientTest.java

@@ -56,9 +56,7 @@
 import com.google.protobuf.DescriptorProtos.FieldDescriptorProto;
 import com.google.protobuf.Descriptors;
 import com.google.protobuf.Descriptors.DescriptorValidationException;
-import com.google.protobuf.DynamicMessage;
 import com.google.protobuf.Int64Value;
-import com.google.protobuf.Message;
 import io.grpc.Status;
 import io.grpc.Status.Code;
 import java.io.ByteArrayOutputStream;
@@ -2546,6 +2544,8 @@ public void timestamp_protobufWrite_customMessage_higherPrecision()
     String table =
         BigQueryResource.formatTableResource(
             ServiceOptions.getDefaultProjectId(), DATASET, tableName);
+
+    // Read all the data as Avro GenericRecords
     List<GenericData.Record> rows = Helper.readAllRows(readClient, parentProjectId, table, null);
     List<String> timestampHigherPrecision =
         rows.stream()