presto-orc/src/main/java/io/prestosql/orc/metadata/OrcMetadataWriter.java/OrcMetadataWriter/toStripeStatistics
class OrcMetadataWriter:    private static OrcProto.StripeStatistics toStripeStatistics(StripeStatistics stripeStatistics)
    {
        return OrcProto.StripeStatistics.newBuilder()
                .addAllColStats(stripeStatistics.getColumnStatistics().stream()
                        .map(OrcMetadataWriter::toColumnStatistics)
                        .collect(toList()))
                .build();
    }