hive/execution/UDFToListMapStringListInt.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017 package org.apache.spark.sql.hive.execution;
0018
0019 import org.apache.hadoop.hive.ql.exec.UDF;
0020
0021 import java.util.*;
0022
0023 /**
0024  * UDF that returns a nested list of maps that uses a string as its key and a list of ints as its
0025  * values.
0026  */
0027 public class UDFToListMapStringListInt extends UDF {
0028   public List<Map<String, List<Integer>>> evaluate(Object o) {
0029     final Map<String, List<Integer>> map = new HashMap<>();
0030     map.put("a", Arrays.asList(1, 2));
0031     map.put("b", Arrays.asList(3, 4));
0032     return Collections.singletonList(map);
0033   }
0034 }