viirya commented on code in PR #45505:
URL: https://github.com/apache/spark/pull/45505#discussion_r1526899957


##########
sql/catalyst/src/main/java/org/apache/spark/sql/connector/metric/CustomFileTaskMetric.java:
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@@ -0,0 +1,37 @@
+/*
+ * 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.connector.metric;
+
+import org.apache.spark.annotation.Evolving;
+
+/**
+ * A custom file task metric. This allows file based data source V2 
implementations
+ * to use a single PartitionReader with multiple file readers. Each file 
reader can
+ * provide its own metrics values and they can be added into the parent 
PartitionReader
+ *
+ * @since 4.0.0
+ */
+@Evolving
+public interface CustomFileTaskMetric extends CustomTaskMetric {

Review Comment:
   Hmm, I am wondering why we need this interface? 



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