/**
* 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.store.direct;
import com.fasterxml.jackson.annotation.JsonTypeName;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.physical.PhysicalOperatorSetupException;
import org.apache.drill.exec.physical.base.AbstractGroupScan;
import org.apache.drill.exec.physical.base.GroupScan;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.base.ScanStats;
import org.apache.drill.exec.physical.base.SubScan;
import org.apache.drill.exec.proto.CoordinationProtos.DrillbitEndpoint;
import org.apache.drill.exec.store.RecordReader;
import java.util.List;
@JsonTypeName("direct-scan")
public class DirectGroupScan extends AbstractGroupScan {
// private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(DirectGroupScan.class);
private final RecordReader reader;
private final ScanStats stats;
public DirectGroupScan(RecordReader reader) {
this(reader, ScanStats.TRIVIAL_TABLE);
}
public DirectGroupScan(RecordReader reader, ScanStats stats) {
super((String) null);
this.reader = reader;
this.stats = stats;
}
@Override
public void applyAssignments(List<DrillbitEndpoint> endpoints) throws PhysicalOperatorSetupException {
assert endpoints.size() == 1;
}
@Override
public SubScan getSpecificScan(int minorFragmentId) throws ExecutionSetupException {
assert minorFragmentId == 0;
return new DirectSubScan(reader);
}
@Override
public int getMaxParallelizationWidth() {
return 1;
}
@Override
public ScanStats getScanStats() {
return stats;
}
@Override
public PhysicalOperator getNewWithChildren(List<PhysicalOperator> children) throws ExecutionSetupException {
assert children == null || children.isEmpty();
return new DirectGroupScan(reader, stats);
}
@Override
public String getDigest() {
return String.valueOf(reader);
}
@Override
public GroupScan clone(List<SchemaPath> columns) {
return this;
}
}