Struct FooterTail 

pub struct FooterTail {
    metadata_length: usize,
    encrypted_footer: bool,
}

Parsed Parquet footer tail (last 8 bytes of a Parquet file)

There are 8 bytes at the end of the Parquet footer with the following layout:

• 4 bytes for the metadata length
• 4 bytes for the magic bytes ‘PAR1’ or ‘PARE’ (encrypted footer)

+-----+------------------+
| len | 'PAR1' or 'PARE' |
+-----+------------------+

Examples

// a non encrypted footer with 28 bytes of metadata
let last_8_bytes: [u8; 8] = [0x1C, 0x00, 0x00, 0x00, b'P', b'A', b'R', b'1'];
let footer_tail = FooterTail::try_from(last_8_bytes).unwrap();
assert_eq!(footer_tail.metadata_length(), 28);
assert_eq!(footer_tail.is_encrypted_footer(), false);

// an encrypted footer with 512 bytes of metadata
let last_8_bytes = vec![0x00, 0x02, 0x00, 0x00, b'P', b'A', b'R', b'E'];
let footer_tail = FooterTail::try_from(&last_8_bytes[..]).unwrap();
assert_eq!(footer_tail.metadata_length(), 512);
assert_eq!(footer_tail.is_encrypted_footer(), true);

Fields

metadata_length: usize

encrypted_footer: bool

Implementations

impl FooterTail

pub fn try_new(slice: &[u8; 8]) -> Result<FooterTail>

Try to decode the footer tail from the given 8 bytes

pub fn metadata_length(&self) -> usize

The length of the footer metadata in bytes

pub fn is_encrypted_footer(&self) -> bool

Whether the footer metadata is encrypted

Trait Implementations

impl Clone for FooterTail

fn clone(&self) -> FooterTail

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FooterTail

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for FooterTail

fn eq(&self, other: &FooterTail) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TryFrom<&[u8]> for FooterTail

type Error = ParquetError

The type returned in the event of a conversion error.

fn try_from(value: &[u8]) -> Result<Self>

Performs the conversion.

impl TryFrom<[u8; 8]> for FooterTail

type Error = ParquetError

The type returned in the event of a conversion error.

fn try_from(value: [u8; 8]) -> Result<Self>

Performs the conversion.

impl Copy for FooterTail

impl Eq for FooterTail

impl StructuralPartialEq for FooterTail