Struct datafusion::common::Statistics

pub struct Statistics {
    pub num_rows: Option<usize>,
    pub total_byte_size: Option<usize>,
    pub column_statistics: Option<Vec<ColumnStatistics, Global>>,
    pub is_exact: bool,
}

Statistics for a relation Fields are optional and can be inexact because the sources sometimes provide approximate estimates for performance reasons and the transformations output are not always predictable.

Fields

num_rows: Option<usize>

The number of table rows

total_byte_size: Option<usize>

total bytes of the table rows

column_statistics: Option<Vec<ColumnStatistics, Global>>

Statistics on a column level

is_exact: bool

If true, any field that is Some(..) is the actual value in the data provided by the operator (it is not an estimate). Any or all other fields might still be None, in which case no information is known. if false, any field that is Some(..) may contain an inexact estimate and may not be the actual value.

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<(), Error>

Formats the value using the given formatter.

impl Default for Statistics

fn default() -> Statistics

Returns the “default value” for a type.

impl PartialEq<Statistics> for Statistics

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

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

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

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

impl Eq for Statistics

impl StructuralEq for Statistics

impl StructuralPartialEq for Statistics