presto-parquet/src/main/java/io/prestosql/parquet/reader/MetadataReader.java/MetadataReader/readParquetSchema
class MetadataReader:    private static MessageType readParquetSchema(List<SchemaElement> schema)
    {
        Iterator<SchemaElement> schemaIterator = schema.iterator();
        SchemaElement rootSchema = schemaIterator.next();
        Types.MessageTypeBuilder builder = Types.buildMessage();
        readTypeSchema(builder, schemaIterator, rootSchema.getNum_children());
        return builder.named(rootSchema.name);
    }