/*
* 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.pig.test.udf.evalfunc;
import java.io.IOException;
import org.apache.pig.AccumulatorEvalFunc;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.BagFactory;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.apache.pig.data.DataType;
import org.apache.pig.impl.logicalLayer.schema.Schema;
public class AppendIndex extends AccumulatorEvalFunc<DataBag> {
private final static TupleFactory mTupleFactory = TupleFactory.getInstance();
private final static BagFactory mBagFactory = BagFactory.getInstance();
private DataBag interBag;
long ct = 0;
@Override
public void accumulate(Tuple input) throws IOException {
if (interBag == null) {
interBag = mBagFactory.newDefaultBag();
ct = 0;
}
for (Tuple t : (DataBag)input.get(0)) {
Tuple t2 = mTupleFactory.newTupleNoCopy(t.getAll());
t2.append(++ct);
interBag.add(t2);
}
}
@Override
public DataBag getValue() {
return interBag;
}
public void cleanup() {
interBag = null;
}
@Override
public Schema outputSchema(Schema inputSchema) {
try {
inputSchema.getField(0).schema.getField(0).schema.add(new Schema.FieldSchema("index", DataType.LONG));
return inputSchema;
} catch (Exception e) {
return null;
}
}
}