add apache header; fix line too long for style

backends-velox/src/main/scala/org/apache/spark/sql/execution/UnsafeArray.scala

@@ -1,8 +1,29 @@
+/*
+ * 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.spark.sql.execution
 
 import org.apache.spark.SparkEnv
 import org.apache.spark.executor.ShuffleWriteMetrics
-import org.apache.spark.memory.{MemoryConsumer, MemoryMode, SparkOutOfMemoryError, TaskMemoryManager}
+import org.apache.spark.memory.{
+  MemoryConsumer,
+  MemoryMode,
+  SparkOutOfMemoryError,
+  TaskMemoryManager
+}
 import org.apache.spark.sql.catalyst.expressions.UnsafeArrayData
 import org.apache.spark.unsafe.{Platform, UnsafeAlignedOffset}
 import org.apache.spark.unsafe.memory.MemoryBlock