Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/1032#discussion_r150682678
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/DynamicSchema.java
---
@@ -0,0 +1,65 @@
+/*
+ * 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.drill.exec.planner.sql;
+
+import org.apache.calcite.jdbc.CalciteSchema;
+import org.apache.calcite.jdbc.SimpleCalciteSchema;
+import org.apache.calcite.schema.Schema;
+import org.apache.calcite.schema.SchemaPlus;
+import org.apache.drill.exec.store.SchemaConfig;
+import org.apache.drill.exec.store.StoragePluginRegistry;
+
+
+/**
+ * Unlike SimpleCalciteSchema, DynamicSchema could have an empty or
partial schemaMap, but it could maintain a map of
+ * name->SchemaFactory, and only register schema when the corresponsdent
name is requested.
+ */
+public class DynamicSchema extends SimpleCalciteSchema {
+
+ protected SchemaConfig schemaConfig;
+ protected StoragePluginRegistry storages;
--- End diff --
Seems that storages is never initialized or used except in the accessor.
---
