Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21306#discussion_r199991918
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/CatalogSupport.java ---
@@ -0,0 +1,36 @@
+/*
+ * 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;
+
+import org.apache.spark.sql.sources.v2.catalog.DataSourceCatalog;
+
+/**
+ * A mix-in interface for {@link DataSourceV2} catalog support. Data
sources can implement this
+ * interface to provide the ability to load, create, alter, and drop
tables.
+ * <p>
+ * Data sources must implement this interface to support logical
operations that combine writing
+ * data with catalog tasks, like create-table-as-select.
+ */
+public interface CatalogSupport {
--- End diff --
After thinking about it more, what we really need in the near future is all
about table: create/alter/lookup/drop tables, instead of how the tables are
organized, like databases, and how other information is stored, like
view/function.
How about we call it `TableSupport`?
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