presto-hive/src/main/java/io/prestosql/plugin/hive/util/Statistics.java/Statistics/createComputedStatisticsToPartitionMap
class Statistics:    public static Map<List<String>, ComputedStatistics> createComputedStatisticsToPartitionMap(
            Collection<ComputedStatistics> computedStatistics,
            List<String> partitionColumns,
            Map<String, Type> columnTypes)
    {
        List<Type> partitionColumnTypes = partitionColumns.stream()
                .map(columnTypes::get)
                .collect(toImmutableList());

        return computedStatistics.stream()
                .collect(toImmutableMap(statistics -> getPartitionValues(statistics, partitionColumns, partitionColumnTypes), statistics -> statistics));
    }