Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19136#discussion_r137699153
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/reader/upward/StatisticsSupport.java
---
@@ -0,0 +1,26 @@
+/*
+ * 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.sources.v2.reader.upward;
+
+/**
+ * A mix in interface for `DataSourceV2Reader`. Users can implement this
interface to report
+ * statistics to Spark.
+ */
+public interface StatisticsSupport {
--- End diff --
I'd like to put column stats in a separated interface, because we already
separate basic stats and column stats in `ANALYZE TABLE`.
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