Struct parquet_format::ColumnMetaData

pub struct ColumnMetaData {
    pub type_: Type,
    pub encodings: Vec<Encoding>,
    pub path_in_schema: Vec<String>,
    pub codec: CompressionCodec,
    pub num_values: i64,
    pub total_uncompressed_size: i64,
    pub total_compressed_size: i64,
    pub key_value_metadata: Option<Vec<KeyValue>>,
    pub data_page_offset: i64,
    pub index_page_offset: Option<i64>,
    pub dictionary_page_offset: Option<i64>,
    pub statistics: Option<Statistics>,
    pub encoding_stats: Option<Vec<PageEncodingStats>>,
    pub bloom_filter_offset: Option<i64>,
}

Description for column metadata

Fields

type_: Type

Type of this column *

encodings: Vec<Encoding>

Set of all encodings used for this column. The purpose is to validate whether we can decode those pages. *

path_in_schema: Vec<String>

Path in schema *

codec: CompressionCodec

Compression codec *

num_values: i64

Number of values in this column *

total_uncompressed_size: i64

total byte size of all uncompressed pages in this column chunk (including the headers) *

total_compressed_size: i64

total byte size of all compressed, and potentially encrypted, pages in this column chunk (including the headers) *

key_value_metadata: Option<Vec<KeyValue>>

Optional key/value metadata *

data_page_offset: i64

Byte offset from beginning of file to first data page *

index_page_offset: Option<i64>

Byte offset from beginning of file to root index page *

dictionary_page_offset: Option<i64>

Byte offset from the beginning of file to first (only) dictionary page *

statistics: Option<Statistics>

optional statistics for this column chunk

encoding_stats: Option<Vec<PageEncodingStats>>

Set of all encodings used for pages in this column chunk. This information can be used to determine if all data pages are dictionary encoded for example *

bloom_filter_offset: Option<i64>

Byte offset from beginning of file to Bloom filter data. *

Implementations

impl ColumnMetaData

pub fn new<F8, F10, F11, F12, F13, F14>(
    type_: Type,
    encodings: Vec<Encoding>,
    path_in_schema: Vec<String>,
    codec: CompressionCodec,
    num_values: i64,
    total_uncompressed_size: i64,
    total_compressed_size: i64,
    key_value_metadata: F8,
    data_page_offset: i64,
    index_page_offset: F10,
    dictionary_page_offset: F11,
    statistics: F12,
    encoding_stats: F13,
    bloom_filter_offset: F14
) -> ColumnMetaData where
    F8: Into<Option<Vec<KeyValue>>>,
    F10: Into<Option<i64>>,
    F11: Into<Option<i64>>,
    F12: Into<Option<Statistics>>,
    F13: Into<Option<Vec<PageEncodingStats>>>,
    F14: Into<Option<i64>>, 

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

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

Trait Implementations

impl Clone for ColumnMetaData

pub fn clone(&self) -> ColumnMetaData

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnMetaData

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

Formats the value using the given formatter.

impl Eq for ColumnMetaData

impl Hash for ColumnMetaData

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 ColumnMetaData

pub fn cmp(&self, other: &ColumnMetaData) -> 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<ColumnMetaData> for ColumnMetaData

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

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

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

This method tests for !=.

impl PartialOrd<ColumnMetaData> for ColumnMetaData

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

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

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

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

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

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

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

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

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

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

impl StructuralEq for ColumnMetaData

impl StructuralPartialEq for ColumnMetaData