presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/serializers/MapLexicoder.java/MapLexicoder/MapLexicoder
class MapLexicoder:    public MapLexicoder(
            Lexicoder<K> keyLexicoder,
            Lexicoder<V> valueLexicoder)
    {
        this.keyLexicoder = keyLexicoder;
        this.valueLexicoder = valueLexicoder;
    }