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  * "License"); you may not use this file except in compliance
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package org.apache.pig.impl.util;
public class LinkedMultiMap<K,V> extends MultiMap<K,V> {

This class simply extends MultiMap to use LinkedHashMap instead of HashMap. This ensures while iterating over keys of MultiMap we get keys in in same order as they were inserted.
    private static final long serialVersionUID = 1L;
    public LinkedMultiMap() {
         = new LinkedHashMap<K, ArrayList<V>>();

size Initial size of the map
    public LinkedMultiMap(int size) {
         = new LinkedHashMap<K, ArrayList<V>>(size);
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