[GitHub] [druid] zachjsh commented on a diff in pull request #13788: Wire up the catalog resolver

["zachjsh (via GitHub)" <gi...@apache.org>]

zachjsh commented on code in PR #13788:
URL: https://github.com/apache/druid/pull/13788#discussion_r1113478802


##########
sql/src/main/java/org/apache/druid/sql/calcite/planner/CatalogResolver.java:
##########
@@ -0,0 +1,74 @@
+/*
+ * 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.druid.sql.calcite.planner;
+
+import org.apache.druid.sql.calcite.table.DatasourceTable;
+import org.apache.druid.sql.calcite.table.DruidTable;
+
+import java.util.Set;
+
+/**
+ * Facade onto the (optional) Druid catalog. Configured in Guice to be
+ * the {@link CatalogResolver.NullCatalogResolver} or to an actual catalog.
+ */
+public interface CatalogResolver
+{
+  CatalogResolver NULL_RESOLVER = new NullCatalogResolver();
+
+  /**
+   * Catalog resolver for when the catalog is not available.
+   */
+  class NullCatalogResolver implements CatalogResolver
+  {
+    @Override
+    public boolean ingestRequiresExistingTable()
+    {
+      return false;
+    }
+
+    @Override
+    public DruidTable resolveDatasource(

Review Comment:
   nit: annotate with`@Nullable`



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