xuefuz commented on a change in pull request #8007: [FLINK-11474][table] Add 
ReadableCatalog, ReadableWritableCatalog, and other …
URL: https://github.com/apache/flink/pull/8007#discussion_r275848866
 
 

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 File path: 
flink-table/flink-table-common/src/main/java/org/apache/flink/table/catalog/ReadableCatalog.java
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 @@ -0,0 +1,116 @@
+/*
+ * 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.flink.table.catalog;
+
+import org.apache.flink.table.catalog.exceptions.DatabaseNotExistException;
+import org.apache.flink.table.catalog.exceptions.TableNotExistException;
+
+import java.util.List;
+
+/**
+ * This interface is responsible for reading database/table/views/UDFs from a 
registered catalog.
+ * It connects a registered catalog and Flink's Table API.
+ */
+public interface ReadableCatalog {
 
 Review comment:
   Sounds good. I will have CatalogException declared in those APIs.

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