/**
* 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.optiq;
import org.apache.drill.jdbc.DrillTable;
import org.eigenbase.rel.TableAccessRelBase;
import org.eigenbase.relopt.RelOptCluster;
import org.eigenbase.relopt.RelOptPlanner;
import org.eigenbase.relopt.RelOptTable;
import org.eigenbase.relopt.RelTraitSet;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
/**
* GroupScan of a Drill table.
*/
public class DrillScan extends TableAccessRelBase implements DrillRel {
private final DrillTable drillTable;
/** Creates a DrillScan. */
public DrillScan(RelOptCluster cluster, RelTraitSet traits, RelOptTable table) {
super(cluster, traits, table);
assert getConvention() == CONVENTION;
this.drillTable = table.unwrap(DrillTable.class);
assert drillTable != null;
}
@Override
public void register(RelOptPlanner planner) {
super.register(planner);
DrillOptiq.registerStandardPlannerRules(planner, drillTable.client);
}
public int implement(DrillImplementor implementor) {
final ObjectNode node = implementor.mapper.createObjectNode();
node.put("op", "scan");
node.put("memo", "initial_scan");
node.put("ref", "_MAP"); // output is a record with a single field, '_MAP'
node.put("storageengine", drillTable.getStorageEngineName());
node.put("selection", implementor.mapper.convertValue(drillTable.getSelection(), JsonNode.class));
implementor.registerSource(drillTable);
return implementor.add(node);
}
}