/**
* 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.generic;
import java.util.ArrayList;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.objectinspector.ListObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
@Description(name ="inline", value= "_FUNC_( ARRAY( STRUCT()[,STRUCT()] "
+ "- explodes and array and struct into a table")
public class GenericUDTFInline extends GenericUDTF {
private transient ListObjectInspector li;
public GenericUDTFInline(){
}
@Override
public StructObjectInspector initialize(ObjectInspector[] ois) throws UDFArgumentException {
//There should be one argument that is a array of struct
if (ois.length!=1){
throw new UDFArgumentException("UDF tables only one argument");
}
if (ois[0].getCategory()!= Category.LIST){
throw new UDFArgumentException("Top level object must be an array but "
+ "was "+ois[0].getTypeName());
}
li = (ListObjectInspector) ois[0];
ObjectInspector sub=li.getListElementObjectInspector();
if (sub.getCategory() != Category.STRUCT){
throw new UDFArgumentException("The sub element must be struct, but was "+sub.getTypeName());
}
return (StructObjectInspector) sub;
}
@Override
public void process(Object[] os) throws HiveException {
for (Object row : new ArrayList<Object>(li.getList(os[0]))) {
forward(row);
}
}
@Override
public void close() throws HiveException {
}
@Override
public String toString() {
return "inline";
}
}