presto-parquet/src/main/java/io/prestosql/parquet/reader/MetadataReader.java/MetadataReader/readStats
class MetadataReader:    public static org.apache.parquet.column.statistics.Statistics<?> readStats(Optional<String> fileCreatedBy, Optional<Statistics> statisticsFromFile, PrimitiveType type)
    {
        Statistics statistics = statisticsFromFile.orElse(null);
        org.apache.parquet.column.statistics.Statistics<?> columnStatistics = new ParquetMetadataConverter().fromParquetStatistics(fileCreatedBy.orElse(null), statistics, type);

        if (type.getOriginalType() == OriginalType.UTF8
                && statistics != null
                && !statistics.isSetMin_value() && !statistics.isSetMax_value() // the min,max fields used for UTF8 since Parquet PARQUET-1025
                && statistics.isSetMin() && statistics.isSetMax()  // the min,max fields used for UTF8 before Parquet PARQUET-1025
                && columnStatistics.genericGetMin() == null && columnStatistics.genericGetMax() == null
                && !CorruptStatistics.shouldIgnoreStatistics(fileCreatedBy.orElse(null), type.getPrimitiveTypeName())) {
            tryReadOldUtf8Stats(statistics, (BinaryStatistics) columnStatistics);
        }

        return columnStatistics;
    }