/**
* 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.udf.ptf;
import java.util.List;
import org.apache.hadoop.hive.ql.exec.PTFPartition;
import org.apache.hadoop.hive.ql.exec.PTFPartition.PTFPartitionIterator;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.hive.ql.plan.PTFDesc;
import org.apache.hadoop.hive.ql.plan.ptf.PartitionedTableFunctionDef;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
public class Noop extends TableFunctionEvaluator {
@Override
public PTFPartition execute(PTFPartition iPart) throws HiveException {
return iPart;
}
@Override
protected void execute(PTFPartitionIterator<Object> pItr, PTFPartition oPart) {
throw new UnsupportedOperationException();
}
public static class NoopResolver extends TableFunctionResolver {
@Override
protected TableFunctionEvaluator createEvaluator(PTFDesc ptfDesc, PartitionedTableFunctionDef tDef) {
return new Noop();
}
@Override
public void setupOutputOI() throws SemanticException {
StructObjectInspector OI = getEvaluator().getTableDef().getInput().getOutputShape().getOI();
setOutputOI(OI);
}
/*
* (non-Javadoc)
* @see org.apache.hadoop.hive.ql.udf.ptf.TableFunctionResolver#carryForwardNames()
* Setting to true is correct only for special internal Functions.
*/
@Override
public boolean carryForwardNames() {
return true;
}
/*
* (non-Javadoc)
* @see org.apache.hadoop.hive.ql.udf.ptf.TableFunctionResolver#getOutputNames()
* Set to null only because carryForwardNames is true.
*/
@Override
public List<String> getOutputColumnNames() {
return null;
}
@Override
public boolean transformsRawInput()
{
return false;
}
@Override
public void initializeOutputOI() throws HiveException {
setupOutputOI();
}
}
}