Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/1032#discussion_r150680951
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/DynamicRootSchema.java
---
@@ -0,0 +1,125 @@
+/*
+ * 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 com.google.common.collect.ImmutableSortedSet;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+import org.apache.calcite.DataContext;
+import org.apache.calcite.jdbc.CalciteRootSchema;
+import org.apache.calcite.jdbc.CalciteSchema;
+
+import org.apache.calcite.linq4j.tree.Expression;
+import org.apache.calcite.linq4j.tree.Expressions;
+import org.apache.calcite.schema.SchemaPlus;
+import org.apache.calcite.schema.impl.AbstractSchema;
+import org.apache.calcite.util.BuiltInMethod;
+import org.apache.calcite.util.Compatible;
+import org.apache.drill.common.exceptions.ExecutionSetupException;
+import org.apache.drill.exec.store.SchemaConfig;
+import org.apache.drill.exec.store.StoragePlugin;
+import org.apache.drill.exec.store.StoragePluginRegistry;
+import org.apache.drill.exec.store.SubSchemaWrapper;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.NavigableSet;
+import java.util.Set;
+
+public class DynamicRootSchema extends DynamicSchema
--- End diff --
Class would benefit from general comments: purpose, references, structure.
---
