Struct parquet_format::ColumnIndex

pub struct ColumnIndex {
    pub null_pages: Vec<bool>,
    pub min_values: Vec<Vec<u8>>,
    pub max_values: Vec<Vec<u8>>,
    pub boundary_order: BoundaryOrder,
    pub null_counts: Option<Vec<i64>>,
}

Description for ColumnIndex. Each [i] refers to the page at OffsetIndex.page_locations[i]

Fields

null_pages: Vec<bool>

A list of Boolean values to determine the validity of the corresponding min and max values. If true, a page contains only null values, and writers have to set the corresponding entries in min_values and max_values to byte[0], so that all lists have the same length. If false, the corresponding entries in min_values and max_values must be valid.

min_values: Vec<Vec<u8>>

Two lists containing lower and upper bounds for the values of each page. These may be the actual minimum and maximum values found on a page, but can also be (more compact) values that do not exist on a page. For example, instead of storing ""Blart Versenwald III", a writer may set min_values[i]="B", max_values[i]="C". Such more compact values must still be valid values within the column's logical type. Readers must make sure that list entries are populated before using them by inspecting null_pages.

max_values: Vec<Vec<u8>>

boundary_order: BoundaryOrder

Stores whether both min_values and max_values are orderd and if so, in which direction. This allows readers to perform binary searches in both lists. Readers cannot assume that max_values[i] <= min_values[i+1], even if the lists are ordered.

null_counts: Option<Vec<i64>>

A list containing the number of null values for each page *

Implementations

impl ColumnIndex

pub fn new<F5>(
    null_pages: Vec<bool>,
    min_values: Vec<Vec<u8>>,
    max_values: Vec<Vec<u8>>,
    boundary_order: BoundaryOrder,
    null_counts: F5
) -> ColumnIndex where
    F5: Into<Option<Vec<i64>>>, 

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

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

Trait Implementations

impl Clone for ColumnIndex

pub fn clone(&self) -> ColumnIndex

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnIndex

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

Formats the value using the given formatter.

impl Eq for ColumnIndex

impl Hash for ColumnIndex

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 ColumnIndex

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

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

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

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

This method tests for !=.

impl PartialOrd<ColumnIndex> for ColumnIndex

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

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

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

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

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

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

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

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

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

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

impl StructuralEq for ColumnIndex

impl StructuralPartialEq for ColumnIndex