/**
* 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.handlers;
import java.io.IOException;
import net.hydromatic.optiq.tools.RelConversionException;
import net.hydromatic.optiq.tools.ValidationException;
import org.apache.drill.exec.ops.QueryContext;
import org.apache.drill.exec.physical.PhysicalPlan;
import org.apache.drill.exec.planner.sql.DirectPlan;
import org.apache.drill.exec.planner.sql.parser.SqlUseSchema;
import org.eigenbase.sql.SqlNode;
public class UseSchemaHandler extends AbstractSqlHandler {
QueryContext context;
public UseSchemaHandler(QueryContext context) {
this.context = context;
}
@Override
public PhysicalPlan getPlan(SqlNode sqlNode) throws ValidationException, RelConversionException, IOException {
SqlUseSchema useSchema = unwrap(sqlNode, SqlUseSchema.class);
String defaultSchema = useSchema.getSchema();
boolean status = context.getSession().setDefaultSchemaPath(defaultSchema, context.getRootSchema());
String msg;
if (status) {
msg = String.format("Default schema changed to '%s'", defaultSchema);
} else {
msg = String.format("Failed to change default schema to '%s'", defaultSchema);
}
return DirectPlan.createDirectPlan(context, status, msg);
}
}