presto-parquet/src/main/java/io/prestosql/parquet/ParquetTypeUtils.java/ParquetTypeUtils/createDecimalType
class ParquetTypeUtils:    private static Type createDecimalType(DecimalMetadata decimalMetadata)
    {
        return DecimalType.createDecimalType(decimalMetadata.getPrecision(), decimalMetadata.getScale());
    }