Github user rdblue commented on a diff in the pull request: https://github.com/apache/spark/pull/21306#discussion_r237975013 --- Diff: sql/catalyst/src/main/java/org/apache/spark/sql/catalog/v2/CatalogProvider.java --- @@ -0,0 +1,50 @@ +/* + * 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.catalog.v2; + +import org.apache.spark.sql.internal.SQLConf; + +/** + * A marker interface to provide a catalog implementation for Spark. + * <p> + * Implementations can provide catalog functions by implementing additional interfaces, like + * {@link TableCatalog} to expose table operations. + * <p> + * Catalog implementations must implement this marker interface to be loaded by + * {@link Catalogs#load(String, SQLConf)}. The loader will instantiate catalog classes using the + * required public no-arg constructor. After creating an instance, it will be configured by calling + * {@link #initialize(CaseInsensitiveStringMap)}. + * <p> + * Catalog implementations are registered to a name by adding a configuration option to Spark: + * {@code spark.sql.catalog.catalog-name=com.example.YourCatalogClass}. All configuration properties + * in the Spark configuration that share the catalog name prefix, + * {@code spark.sql.catalog.catalog-name.(key)=(value)} will be passed in the case insensitive + * string map of options in initialization with the prefix removed. An additional property, + * {@code name}, is also added to the options and will contain the catalog's name; in this case, + * "catalog-name". + */ +public interface CatalogProvider { --- End diff -- @cloud-fan, do you want me to create the `sql-api` package in this PR, or do you want to add a separate PR to move the current v2 API?
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