Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19136#discussion_r138945691
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/DataSourceV2.java ---
@@ -0,0 +1,28 @@
+/*
+ * 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;
+
+/**
+ * The base interface for data source v2. Implementations must have a
public, no arguments
+ * constructor.
+ *
+ * Note that this is an empty interface, data source implementations
should mix-in at least one of
+ * the plug-in interfaces like `ReadSupport`. Otherwise it's just a dummy
data source which is
--- End diff --
use an actual link ...
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