presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/HivePageSinkMetadata.java/JsonSerializableEntry/JsonSerializableEntry
class JsonSerializableEntry:        @JsonCreator
        public JsonSerializableEntry(@JsonProperty("key") K key, @JsonProperty("value") V value)
        {
            this.key = key;
            this.value = value;
        }