Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/527#discussion_r68865539
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/SchemaTreeProvider.java
---
@@ -0,0 +1,105 @@
+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.store;
+
+import org.apache.calcite.jdbc.SimpleCalciteSchema;
+import org.apache.calcite.schema.SchemaPlus;
+import org.apache.drill.common.AutoCloseables;
+import org.apache.drill.common.exceptions.DrillRuntimeException;
+import org.apache.drill.exec.ExecConstants;
+import org.apache.drill.exec.server.DrillbitContext;
+import org.apache.drill.exec.store.SchemaConfig.SchemaConfigInfoProvider;
+import org.apache.drill.exec.util.ImpersonationUtil;
+
+import com.google.common.collect.Lists;
+
+import java.io.IOException;
+import java.util.List;
+
+/**
+ * Class which creates new schema trees. It keeps track of newly created
schema trees and closes them safely as
+ * part of {@link #close()}.
+ */
+public class SchemaTreeProvider implements AutoCloseable {
+ private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(SchemaTreeProvider.class);
+
+ private final DrillbitContext dContext;
+ private final List<SchemaPlus> schemaTreesToClose;
+ private final boolean isImpersonationEnabled;
+
+ public SchemaTreeProvider(final DrillbitContext dContext) {
+ this.dContext = dContext;
+ schemaTreesToClose = Lists.newArrayList();
+ isImpersonationEnabled =
dContext.getConfig().getBoolean(ExecConstants.IMPERSONATION_ENABLED);
+ }
+
+ /**
+ * Return root schema with schema owner as the given user.
+ *
+ * @param userName Name of the user who is accessing the storage sources.
+ * @param provider {@link SchemaConfigInfoProvider} instance
+ * @return Root of the schema tree.
+ */
+ public SchemaPlus getRootSchema(final String userName, final
SchemaConfigInfoProvider provider) {
+ final String schemaUser = isImpersonationEnabled ? userName :
ImpersonationUtil.getProcessUserName();
+ final SchemaConfig schemaConfig = SchemaConfig.newBuilder(schemaUser,
provider).build();
+ return getRootSchema(schemaConfig);
+ }
+
+ /**
+ * Create and return a SchemaTree with given <i>schemaConfig</i>.
+ * @param schemaConfig
+ * @return
+ */
+ public SchemaPlus getRootSchema(SchemaConfig schemaConfig) {
--- End diff --
createRootSchema(...)?
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