/**
* 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.hadoop.hive.ql.io;
import org.apache.hadoop.hive.ql.io.OneNullRowInputFormat.OneNullRowRecordReader;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedInputFormatInterface;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
/**
* Same as OneNullRowInputFormat, but with 0 rows. There's no way to store smth like OperatorDesc
* in InputFormat, so this is how it is. We could perhaps encode the number of null rows in the
* null path. However, NullIF can be used without using NullFS, so that would not be possible.
*/
public class ZeroRowsInputFormat extends NullRowsInputFormat
implements VectorizedInputFormatInterface {
@SuppressWarnings("unchecked")
@Override
public RecordReader<NullWritable, NullWritable> getRecordReader(InputSplit split,
JobConf conf, Reporter arg2) throws IOException {
return new ZeroRowsRecordReader(conf, split);
}
public static class ZeroRowsRecordReader extends OneNullRowRecordReader {
public ZeroRowsRecordReader(Configuration conf, InputSplit split) throws IOException {
super(conf, split);
processed = true;
}
}
}