Struct parquet_format::FileMetaData

pub struct FileMetaData {
    pub version: i32,
    pub schema: Vec<SchemaElement>,
    pub num_rows: i64,
    pub row_groups: Vec<RowGroup>,
    pub key_value_metadata: Option<Vec<KeyValue>>,
    pub created_by: Option<String>,
    pub column_orders: Option<Vec<ColumnOrder>>,
    pub encryption_algorithm: Option<EncryptionAlgorithm>,
    pub footer_signing_key_metadata: Option<Vec<u8>>,
}

Description for file metadata

Fields

version: i32

Version of this file *

schema: Vec<SchemaElement>

Parquet schema for this file. This schema contains metadata for all the columns. The schema is represented as a tree with a single root. The nodes of the tree are flattened to a list by doing a depth-first traversal. The column metadata contains the path in the schema for that column which can be used to map columns to nodes in the schema. The first element is the root *

num_rows: i64

Number of rows in this file *

row_groups: Vec<RowGroup>

Row groups in this file *

key_value_metadata: Option<Vec<KeyValue>>

Optional key/value metadata *

created_by: Option<String>

String for application that wrote this file. This should be in the format version (build ). e.g. impala version 1.0 (build 6cf94d29b2b7115df4de2c06e2ab4326d721eb55)

column_orders: Option<Vec<ColumnOrder>>

Sort order used for the min_value and max_value fields of each column in this file. Sort orders are listed in the order matching the columns in the schema. The indexes are not necessary the same though, because only leaf nodes of the schema are represented in the list of sort orders.

Without column_orders, the meaning of the min_value and max_value fields is undefined. To ensure well-defined behaviour, if min_value and max_value are written to a Parquet file, column_orders must be written as well.

The obsolete min and max fields are always sorted by signed comparison regardless of column_orders.

encryption_algorithm: Option<EncryptionAlgorithm>

Encryption algorithm. This field is set only in encrypted files with plaintext footer. Files with encrypted footer store algorithm id in FileCryptoMetaData structure.

footer_signing_key_metadata: Option<Vec<u8>>

Retrieval metadata of key used for signing the footer. Used only in encrypted files with plaintext footer.

Implementations

impl FileMetaData

pub fn new<F5, F6, F7, F8, F9>(
    version: i32,
    schema: Vec<SchemaElement>,
    num_rows: i64,
    row_groups: Vec<RowGroup>,
    key_value_metadata: F5,
    created_by: F6,
    column_orders: F7,
    encryption_algorithm: F8,
    footer_signing_key_metadata: F9
) -> FileMetaData where
    F5: Into<Option<Vec<KeyValue>>>,
    F6: Into<Option<String>>,
    F7: Into<Option<Vec<ColumnOrder>>>,
    F8: Into<Option<EncryptionAlgorithm>>,
    F9: Into<Option<Vec<u8>>>, 

pub fn read_from_in_protocol(
    i_prot: &mut dyn TInputProtocol
) -> Result<FileMetaData>

pub fn write_to_out_protocol(
    &self,
    o_prot: &mut dyn TOutputProtocol
) -> Result<()>

Trait Implementations

impl Clone for FileMetaData

pub fn clone(&self) -> FileMetaData

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for FileMetaData

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

Formats the value using the given formatter.

impl Eq for FileMetaData

impl Hash for FileMetaData

pub fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

pub fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl Ord for FileMetaData

pub fn cmp(&self, other: &FileMetaData) -> Ordering

This method returns an Ordering between self and other.

#[must_use]pub fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]pub fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]pub fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<FileMetaData> for FileMetaData

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl PartialOrd<FileMetaData> for FileMetaData

pub fn partial_cmp(&self, other: &FileMetaData) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

pub fn lt(&self, other: &FileMetaData) -> bool

This method tests less than (for self and other) and is used by the < operator.

pub fn le(&self, other: &FileMetaData) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

pub fn gt(&self, other: &FileMetaData) -> bool

This method tests greater than (for self and other) and is used by the > operator.

pub fn ge(&self, other: &FileMetaData) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralEq for FileMetaData

impl StructuralPartialEq for FileMetaData