Struct Statistics

pub struct Statistics {
    pub max: Option<Vec<u8>>,
    pub min: Option<Vec<u8>>,
    pub null_count: Option<i64>,
    pub distinct_count: Option<i64>,
    pub max_value: Option<Vec<u8>>,
    pub min_value: Option<Vec<u8>>,
    pub is_max_value_exact: Option<bool>,
    pub is_min_value_exact: Option<bool>,
}

Statistics per row group and per page All fields are optional.

Fields

max: Option<Vec<u8>>

DEPRECATED: min and max value of the column. Use min_value and max_value.

Values are encoded using PLAIN encoding, except that variable-length byte arrays do not include a length prefix.

These fields encode min and max values determined by signed comparison only. New files should use the correct order for a column’s logical type and store the values in the min_value and max_value fields.

To support older readers, these may be set when the column order is signed.

min: Option<Vec<u8>>

null_count: Option<i64>

Count of null values in the column.

Writers SHOULD always write this field even if it is zero (i.e. no null value) or the column is not nullable. Readers MUST distinguish between null_count not being present and null_count == 0. If null_count is not present, readers MUST NOT assume null_count == 0.

distinct_count: Option<i64>

count of distinct values occurring

max_value: Option<Vec<u8>>

Lower and upper bound values for the column, determined by its ColumnOrder.

These may be the actual minimum and maximum values found on a page or column chunk, but can also be (more compact) values that do not exist on a page or column chunk. For example, instead of storing “Blart Versenwald III”, a writer may set min_value=“B”, max_value=“C”. Such more compact values must still be valid values within the column’s logical type.

Values are encoded using PLAIN encoding, except that variable-length byte arrays do not include a length prefix.

min_value: Option<Vec<u8>>

is_max_value_exact: Option<bool>

If true, max_value is the actual maximum value for a column

is_min_value_exact: Option<bool>

If true, min_value is the actual minimum value for a column

Implementations

impl Statistics

pub fn new<F1, F2, F3, F4, F5, F6, F7, F8>( max: F1, min: F2, null_count: F3, distinct_count: F4, max_value: F5, min_value: F6, is_max_value_exact: F7, is_min_value_exact: F8, ) -> Statistics

where F1: Into<Option<Vec<u8>>>, F2: Into<Option<Vec<u8>>>, F3: Into<Option<i64>>, F4: Into<Option<i64>>, F5: Into<Option<Vec<u8>>>, F6: Into<Option<Vec<u8>>>, F7: Into<Option<bool>>, F8: Into<Option<bool>>,

pub fn read_from_in_protocol<T: TInputProtocol>( i_prot: &mut T, ) -> Result<Statistics>

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

Trait Implementations

impl Clone for Statistics

fn clone(&self) -> Statistics

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Statistics

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

Formats the value using the given formatter.

impl Hash for Statistics

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Statistics

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Statistics

fn eq(&self, other: &Statistics) -> 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 PartialOrd for Statistics

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl ReadThrift for Statistics

fn read_from_in_protocol<T: TInputProtocol>( i_prot: &mut T, ) -> Result<Statistics>

impl Eq for Statistics

impl StructuralPartialEq for Statistics