/**
* 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.physical.impl.sort;
import javax.inject.Named;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.record.VectorContainer;
import org.apache.drill.exec.record.selection.SelectionVector4;
import org.apache.hadoop.util.IndexedSortable;
import org.apache.hadoop.util.QuickSort;
public abstract class SortTemplate implements Sorter, IndexedSortable{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(SortTemplate.class);
private SelectionVector4 vector4;
public void setup(FragmentContext context, RecordBatch hyperBatch) throws SchemaChangeException{
// we pass in the local hyperBatch since that is where we'll be reading data.
vector4 = hyperBatch.getSelectionVector4();
doSetup(context, hyperBatch, null);
}
@Override
public void sort(SelectionVector4 vector4, VectorContainer container){
QuickSort qs = new QuickSort();
qs.sort(this, 0, vector4.getTotalCount());
}
@Override
public void swap(int sv0, int sv1) {
int tmp = vector4.get(sv0);
vector4.set(sv0, vector4.get(sv1));
vector4.set(sv1, tmp);
}
@Override
public int compare(int leftIndex, int rightIndex) {
int sv1 = vector4.get(leftIndex);
int sv2 = vector4.get(rightIndex);
return doEval(sv1, sv2);
}
public abstract void doSetup(@Named("context") FragmentContext context, @Named("incoming") RecordBatch incoming, @Named("outgoing") RecordBatch outgoing);
public abstract int doEval(@Named("leftIndex") int leftIndex, @Named("rightIndex") int rightIndex);
}